Fragmented Internet Connection

When users on my LAN try to access the web they often get "Page cannot be
displayed" errors. They can refresh their browser anbd the page comes up
just
fine. It happens to Win2K and WinXP clients. Traffic routes through SBS2003
Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting directly
through the router and bypassing the server for Internet access the problem
doesn't happen

Server and Clients' internet connection up and working but sporadic...(there
are 12 client computers and
all dhcp enabled...with the default gateway & DNS being the server -
192.168.16.2) Any
help would be enormously appreciated!

IP Config of Server:
Windows IP Configuration

Host Name . . . . . . . . . . . . : MYSERVER1
Primary Dns Suffix . . . . . . . : mydomain.local
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : Yes
DNS Suffix Search List. . . . . . : mydomain.local

Ethernet adapter Network Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 S Server Adapter
Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.1.10
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.2
DNS Servers . . . . . . . . . . . : 192.168.16.2
Primary WINS Server . . . . . . . : 192.168.16.2
NetBIOS over Tcpip. . . . . . . . : Disabled

Ethernet adapter Server Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
Connection
Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.16.2
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . : 192.168.16.2
Primary WINS Server . . . . . . . : 192.168.16.2

I have tried the DNS server both with and without the ISP's forwarders and
without to no avail. (and have also tried switching off the client computer'
NIC's power management...)

Any help greatly appreciated

Regards

Johnny

Are you merely routing LAN traffic through the multihomed server, or is the
server performing NAT and then sending it to a router which also provides
NAT? One possible explanation for this kind of erratic behavior is double
NAT aka running a NAT device behind another NAT device. Sometimes this
works fine, and sometimes, well, it just doesn't. If you are double NATing
and your Internet router supports static routes, try disabling NAT on the
server and configuring a route to 192.168.16.x on the router..

Doug Sherman
MCSE, MCSA, MCP+I, MVP

"JohnnyD" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> When users on my LAN try to access the web they often get "Page cannot be
> displayed" errors. They can refresh their browser anbd the page comes up
> just
> fine. It happens to Win2K and WinXP clients. Traffic routes through
SBS2003
> Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting directly
> through the router and bypassing the server for Internet access the
problem
> doesn't happen
>
> Server and Clients' internet connection up and working but
sporadic...(there
> are 12 client computers and
> all dhcp enabled...with the default gateway & DNS being the server -
> 192.168.16.2) Any
> help would be enormously appreciated!
>
> IP Config of Server:
> Windows IP Configuration
>
> Host Name . . . . . . . . . . . . : MYSERVER1
> Primary Dns Suffix . . . . . . . : mydomain.local
> Node Type . . . . . . . . . . . . : Unknown
> IP Routing Enabled. . . . . . . . : Yes
> WINS Proxy Enabled. . . . . . . . : Yes
> DNS Suffix Search List. . . . . . : mydomain.local
>
> Ethernet adapter Network Connection 2:
>
> Connection-specific DNS Suffix . :
> Description . . . . . . . . . . . : Intel(R) PRO/100 S Server Adapter
> Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
> DHCP Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 192.168.1.10
> Subnet Mask . . . . . . . . . . . : 255.255.255.0
> Default Gateway . . . . . . . . . : 192.168.1.2
> DNS Servers . . . . . . . . . . . : 192.168.16.2
> Primary WINS Server . . . . . . . : 192.168.16.2
> NetBIOS over Tcpip. . . . . . . . : Disabled
>
> Ethernet adapter Server Local Area Connection:
>
> Connection-specific DNS Suffix . :
> Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
> Connection
> Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
> DHCP Enabled. . . . . . . . . . . : No
> IP Address. . . . . . . . . . . . : 192.168.16.2
> Subnet Mask . . . . . . . . . . . : 255.255.255.0
> Default Gateway . . . . . . . . . :
> DNS Servers . . . . . . . . . . . : 192.168.16.2
> Primary WINS Server . . . . . . . : 192.168.16.2
>
> I have tried the DNS server both with and without the ISP's forwarders and
> without to no avail. (and have also tried switching off the client
computer'
> NIC's power management...)
>
> Any help greatly appreciated
>
> Regards
>
> Johnny
>
>
>

Hi Doug
Thanks for looking at this
I am really only routing it thro' the server and have not set up RRAS/NAT as
there are so few users. there is NAT configured on the Binatone router and
the Server's client network is DHCP enabled...should I set up a RRAS server
and disable NAT on the router?
I do have port 80 (among others) translation directly beamed to the server's
Ethernet adapter Network Connection (external interface 192.168.1.10)...

"Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
news:%23$(E-Mail Removed)...
> Are you merely routing LAN traffic through the multihomed server, or is
the
> server performing NAT and then sending it to a router which also provides
> NAT? One possible explanation for this kind of erratic behavior is double
> NAT aka running a NAT device behind another NAT device. Sometimes this
> works fine, and sometimes, well, it just doesn't. If you are double
NATing
> and your Internet router supports static routes, try disabling NAT on the
> server and configuring a route to 192.168.16.x on the router..
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "JohnnyD" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > When users on my LAN try to access the web they often get "Page cannot
be
> > displayed" errors. They can refresh their browser anbd the page comes up
> > just
> > fine. It happens to Win2K and WinXP clients. Traffic routes through
> SBS2003
> > Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting
directly
> > through the router and bypassing the server for Internet access the
> problem
> > doesn't happen
> >
> > Server and Clients' internet connection up and working but
> sporadic...(there
> > are 12 client computers and
> > all dhcp enabled...with the default gateway & DNS being the server -
> > 192.168.16.2) Any
> > help would be enormously appreciated!
> >
> > IP Config of Server:
> > Windows IP Configuration
> >
> > Host Name . . . . . . . . . . . . : MYSERVER1
> > Primary Dns Suffix . . . . . . . : mydomain.local
> > Node Type . . . . . . . . . . . . : Unknown
> > IP Routing Enabled. . . . . . . . : Yes
> > WINS Proxy Enabled. . . . . . . . : Yes
> > DNS Suffix Search List. . . . . . : mydomain.local
> >
> > Ethernet adapter Network Connection 2:
> >
> > Connection-specific DNS Suffix . :
> > Description . . . . . . . . . . . : Intel(R) PRO/100 S Server Adapter
> > Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
> > DHCP Enabled. . . . . . . . . . . : No
> > IP Address. . . . . . . . . . . . : 192.168.1.10
> > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > Default Gateway . . . . . . . . . : 192.168.1.2
> > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > Primary WINS Server . . . . . . . : 192.168.16.2
> > NetBIOS over Tcpip. . . . . . . . : Disabled
> >
> > Ethernet adapter Server Local Area Connection:
> >
> > Connection-specific DNS Suffix . :
> > Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
> > Connection
> > Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
> > DHCP Enabled. . . . . . . . . . . : No
> > IP Address. . . . . . . . . . . . : 192.168.16.2
> > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > Default Gateway . . . . . . . . . :
> > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > Primary WINS Server . . . . . . . : 192.168.16.2
> >
> > I have tried the DNS server both with and without the ISP's forwarders
and
> > without to no avail. (and have also tried switching off the client
> computer'
> > NIC's power management...)
> >
> > Any help greatly appreciated
> >
> > Regards
> >
> > Johnny
> >
> >
> >
>
>

OK -

1. Obviously, my guess was wrong - you do have a double NAT issue.

2. You cannot disable NAT on the router - well, you can, but if you do, a
192.168.1.x machine will not get Internet access.

3. What you could do is eliminate the router - ie. enable NAT on the server
and connect the modem (cable/DSL?) directly to the server's WAN NIC, thereby
giving the WAN NIC a public address. In the scenario you describe, I'm not
sure what the purpose of the router is unless you have other machines on the
192.168.1.x network. Even if you don't, the router undoubtedly provides a
firewall and other features which may be desireable. So it's probably worth
trying to make the current configuration work.

4. With your current configuration, your router needs a static route to
192.168.16.x - double check to make sure that this is configured correctly.

5. Double check the forwarders list on your DNS server. ISPs sometimes
change DNS server IPs without notice to you. Also, it is easy to make a
typo when entering these addresses.

6. On your Server, try:

Right click My Network Places and select Properties; click Advanced -
Advanced Settrings. Make sure the Local Area Connection for the
192.168.16.2 NIC is at the top of the binding order.

Doug Sherman
MCSE, MCSA, MCP+I, MVP

"JohnnyD" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi Doug
> Thanks for looking at this
> I am really only routing it thro' the server and have not set up RRAS/NAT
as
> there are so few users. there is NAT configured on the Binatone router and
> the Server's client network is DHCP enabled...should I set up a RRAS
server
> and disable NAT on the router?
> I do have port 80 (among others) translation directly beamed to the
server's
> Ethernet adapter Network Connection (external interface 192.168.1.10)...
>
> "Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
> news:%23$(E-Mail Removed)...
> > Are you merely routing LAN traffic through the multihomed server, or is
> the
> > server performing NAT and then sending it to a router which also
provides
> > NAT? One possible explanation for this kind of erratic behavior is
double
> > NAT aka running a NAT device behind another NAT device. Sometimes this
> > works fine, and sometimes, well, it just doesn't. If you are double
> NATing
> > and your Internet router supports static routes, try disabling NAT on
the
> > server and configuring a route to 192.168.16.x on the router..
> >
> > Doug Sherman
> > MCSE, MCSA, MCP+I, MVP
> >
> > "JohnnyD" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > When users on my LAN try to access the web they often get "Page cannot
> be
> > > displayed" errors. They can refresh their browser anbd the page comes
up
> > > just
> > > fine. It happens to Win2K and WinXP clients. Traffic routes through
> > SBS2003
> > > Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting
> directly
> > > through the router and bypassing the server for Internet access the
> > problem
> > > doesn't happen
> > >
> > > Server and Clients' internet connection up and working but
> > sporadic...(there
> > > are 12 client computers and
> > > all dhcp enabled...with the default gateway & DNS being the server -
> > > 192.168.16.2) Any
> > > help would be enormously appreciated!
> > >
> > > IP Config of Server:
> > > Windows IP Configuration
> > >
> > > Host Name . . . . . . . . . . . . : MYSERVER1
> > > Primary Dns Suffix . . . . . . . : mydomain.local
> > > Node Type . . . . . . . . . . . . : Unknown
> > > IP Routing Enabled. . . . . . . . : Yes
> > > WINS Proxy Enabled. . . . . . . . : Yes
> > > DNS Suffix Search List. . . . . . : mydomain.local
> > >
> > > Ethernet adapter Network Connection 2:
> > >
> > > Connection-specific DNS Suffix . :
> > > Description . . . . . . . . . . . : Intel(R) PRO/100 S Server Adapter
> > > Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
> > > DHCP Enabled. . . . . . . . . . . : No
> > > IP Address. . . . . . . . . . . . : 192.168.1.10
> > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > Default Gateway . . . . . . . . . : 192.168.1.2
> > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > Primary WINS Server . . . . . . . : 192.168.16.2
> > > NetBIOS over Tcpip. . . . . . . . : Disabled
> > >
> > > Ethernet adapter Server Local Area Connection:
> > >
> > > Connection-specific DNS Suffix . :
> > > Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
> > > Connection
> > > Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
> > > DHCP Enabled. . . . . . . . . . . : No
> > > IP Address. . . . . . . . . . . . : 192.168.16.2
> > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > Default Gateway . . . . . . . . . :
> > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > Primary WINS Server . . . . . . . : 192.168.16.2
> > >
> > > I have tried the DNS server both with and without the ISP's forwarders
> and
> > > without to no avail. (and have also tried switching off the client
> > computer'
> > > NIC's power management...)
> > >
> > > Any help greatly appreciated
> > >
> > > Regards
> > >
> > > Johnny
> > >
> > >
> > >
> >
> >
>
>

Uh, #1. should be ..........you do NOT have a double NAT issue.

Doug Sherman
MCSE, MCSA, MCP+I, MVP


"Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> OK -
>
> 1. Obviously, my guess was wrong - you do have a double NAT issue.
>
> 2. You cannot disable NAT on the router - well, you can, but if you do, a
> 192.168.1.x machine will not get Internet access.
>
> 3. What you could do is eliminate the router - ie. enable NAT on the
server
> and connect the modem (cable/DSL?) directly to the server's WAN NIC,
thereby
> giving the WAN NIC a public address. In the scenario you describe, I'm
not
> sure what the purpose of the router is unless you have other machines on
the
> 192.168.1.x network. Even if you don't, the router undoubtedly provides a
> firewall and other features which may be desireable. So it's probably
worth
> trying to make the current configuration work.
>
> 4. With your current configuration, your router needs a static route to
> 192.168.16.x - double check to make sure that this is configured
correctly.
>
> 5. Double check the forwarders list on your DNS server. ISPs sometimes
> change DNS server IPs without notice to you. Also, it is easy to make a
> typo when entering these addresses.
>
> 6. On your Server, try:
>
> Right click My Network Places and select Properties; click Advanced -
> Advanced Settrings. Make sure the Local Area Connection for the
> 192.168.16.2 NIC is at the top of the binding order.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
> "JohnnyD" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > Hi Doug
> > Thanks for looking at this
> > I am really only routing it thro' the server and have not set up
RRAS/NAT
> as
> > there are so few users. there is NAT configured on the Binatone router
and
> > the Server's client network is DHCP enabled...should I set up a RRAS
> server
> > and disable NAT on the router?
> > I do have port 80 (among others) translation directly beamed to the
> server's
> > Ethernet adapter Network Connection (external interface 192.168.1.10)...
> >
> > "Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
> > news:%23$(E-Mail Removed)...
> > > Are you merely routing LAN traffic through the multihomed server, or
is
> > the
> > > server performing NAT and then sending it to a router which also
> provides
> > > NAT? One possible explanation for this kind of erratic behavior is
> double
> > > NAT aka running a NAT device behind another NAT device. Sometimes
this
> > > works fine, and sometimes, well, it just doesn't. If you are double
> > NATing
> > > and your Internet router supports static routes, try disabling NAT on
> the
> > > server and configuring a route to 192.168.16.x on the router..
> > >
> > > Doug Sherman
> > > MCSE, MCSA, MCP+I, MVP
> > >
> > > "JohnnyD" <(E-Mail Removed)> wrote in message
> > > news:(E-Mail Removed)...
> > > > When users on my LAN try to access the web they often get "Page
cannot
> > be
> > > > displayed" errors. They can refresh their browser anbd the page
comes
> up
> > > > just
> > > > fine. It happens to Win2K and WinXP clients. Traffic routes through
> > > SBS2003
> > > > Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting
> > directly
> > > > through the router and bypassing the server for Internet access the
> > > problem
> > > > doesn't happen
> > > >
> > > > Server and Clients' internet connection up and working but
> > > sporadic...(there
> > > > are 12 client computers and
> > > > all dhcp enabled...with the default gateway & DNS being the server -
> > > > 192.168.16.2) Any
> > > > help would be enormously appreciated!
> > > >
> > > > IP Config of Server:
> > > > Windows IP Configuration
> > > >
> > > > Host Name . . . . . . . . . . . . : MYSERVER1
> > > > Primary Dns Suffix . . . . . . . : mydomain.local
> > > > Node Type . . . . . . . . . . . . : Unknown
> > > > IP Routing Enabled. . . . . . . . : Yes
> > > > WINS Proxy Enabled. . . . . . . . : Yes
> > > > DNS Suffix Search List. . . . . . : mydomain.local
> > > >
> > > > Ethernet adapter Network Connection 2:
> > > >
> > > > Connection-specific DNS Suffix . :
> > > > Description . . . . . . . . . . . : Intel(R) PRO/100 S Server
Adapter
> > > > Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
> > > > DHCP Enabled. . . . . . . . . . . : No
> > > > IP Address. . . . . . . . . . . . : 192.168.1.10
> > > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > > Default Gateway . . . . . . . . . : 192.168.1.2
> > > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > > Primary WINS Server . . . . . . . : 192.168.16.2
> > > > NetBIOS over Tcpip. . . . . . . . : Disabled
> > > >
> > > > Ethernet adapter Server Local Area Connection:
> > > >
> > > > Connection-specific DNS Suffix . :
> > > > Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
> > > > Connection
> > > > Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
> > > > DHCP Enabled. . . . . . . . . . . : No
> > > > IP Address. . . . . . . . . . . . : 192.168.16.2
> > > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > > Default Gateway . . . . . . . . . :
> > > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > > Primary WINS Server . . . . . . . : 192.168.16.2
> > > >
> > > > I have tried the DNS server both with and without the ISP's
forwarders
> > and
> > > > without to no avail. (and have also tried switching off the client
> > > computer'
> > > > NIC's power management...)
> > > >
> > > > Any help greatly appreciated
> > > >
> > > > Regards
> > > >
> > > > Johnny
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>

Hi Doug
The router is the NAT-enabled DSL modem which is directly connected to the
Server's WAN NIC and there are no other machines on the 192.168.1.x network
apart from the Server (WAN NIC - 192.168.1.10) and the modem (192.168.1.2).
You were totally correct about the forwarders, ISP had changed them (even
tho' they gave me the old ones 10 days ago!)
However, even with new ones (4 of them and a 4-second timeout), internet
connection cutoffs are still occurring (though they eventually get through
to their desired webpages when they press refresh several times this has to
be DNS, no?)...
Any ideas?
Thanks again, for your help on this.

"Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Uh, #1. should be ..........you do NOT have a double NAT issue.
>
> Doug Sherman
> MCSE, MCSA, MCP+I, MVP
>
>
> "Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
> news:%(E-Mail Removed)...
> > OK -
> >
> > 1. Obviously, my guess was wrong - you do have a double NAT issue.
> >
> > 2. You cannot disable NAT on the router - well, you can, but if you do,
a
> > 192.168.1.x machine will not get Internet access.
> >
> > 3. What you could do is eliminate the router - ie. enable NAT on the
> server
> > and connect the modem (cable/DSL?) directly to the server's WAN NIC,
> thereby
> > giving the WAN NIC a public address. In the scenario you describe, I'm
> not
> > sure what the purpose of the router is unless you have other machines on
> the
> > 192.168.1.x network. Even if you don't, the router undoubtedly provides
a
> > firewall and other features which may be desireable. So it's probably
> worth
> > trying to make the current configuration work.
> >
> > 4. With your current configuration, your router needs a static route to
> > 192.168.16.x - double check to make sure that this is configured
> correctly.
> >
> > 5. Double check the forwarders list on your DNS server. ISPs sometimes
> > change DNS server IPs without notice to you. Also, it is easy to make a
> > typo when entering these addresses.
> >
> > 6. On your Server, try:
> >
> > Right click My Network Places and select Properties; click Advanced -
> > Advanced Settrings. Make sure the Local Area Connection for the
> > 192.168.16.2 NIC is at the top of the binding order.
> >
> > Doug Sherman
> > MCSE, MCSA, MCP+I, MVP
> >
> > "JohnnyD" <(E-Mail Removed)> wrote in message
> > news:(E-Mail Removed)...
> > > Hi Doug
> > > Thanks for looking at this
> > > I am really only routing it thro' the server and have not set up
> RRAS/NAT
> > as
> > > there are so few users. there is NAT configured on the Binatone router
> and
> > > the Server's client network is DHCP enabled...should I set up a RRAS
> > server
> > > and disable NAT on the router?
> > > I do have port 80 (among others) translation directly beamed to the
> > server's
> > > Ethernet adapter Network Connection (external interface
192.168.1.10)...
> > >
> > > "Doug Sherman [MVP]" <(E-Mail Removed)> wrote in message
> > > news:%23$(E-Mail Removed)...
> > > > Are you merely routing LAN traffic through the multihomed server, or
> is
> > > the
> > > > server performing NAT and then sending it to a router which also
> > provides
> > > > NAT? One possible explanation for this kind of erratic behavior is
> > double
> > > > NAT aka running a NAT device behind another NAT device. Sometimes
> this
> > > > works fine, and sometimes, well, it just doesn't. If you are double
> > > NATing
> > > > and your Internet router supports static routes, try disabling NAT
on
> > the
> > > > server and configuring a route to 192.168.16.x on the router..
> > > >
> > > > Doug Sherman
> > > > MCSE, MCSA, MCP+I, MVP
> > > >
> > > > "JohnnyD" <(E-Mail Removed)> wrote in message
> > > > news:(E-Mail Removed)...
> > > > > When users on my LAN try to access the web they often get "Page
> cannot
> > > be
> > > > > displayed" errors. They can refresh their browser anbd the page
> comes
> > up
> > > > > just
> > > > > fine. It happens to Win2K and WinXP clients. Traffic routes
through
> > > > SBS2003
> > > > > Standard NIC #1 and out SBS2003 Standard WAN NIC. When connecting
> > > directly
> > > > > through the router and bypassing the server for Internet access
the
> > > > problem
> > > > > doesn't happen
> > > > >
> > > > > Server and Clients' internet connection up and working but
> > > > sporadic...(there
> > > > > are 12 client computers and
> > > > > all dhcp enabled...with the default gateway & DNS being the
server -
> > > > > 192.168.16.2) Any
> > > > > help would be enormously appreciated!
> > > > >
> > > > > IP Config of Server:
> > > > > Windows IP Configuration
> > > > >
> > > > > Host Name . . . . . . . . . . . . : MYSERVER1
> > > > > Primary Dns Suffix . . . . . . . : mydomain.local
> > > > > Node Type . . . . . . . . . . . . : Unknown
> > > > > IP Routing Enabled. . . . . . . . : Yes
> > > > > WINS Proxy Enabled. . . . . . . . : Yes
> > > > > DNS Suffix Search List. . . . . . : mydomain.local
> > > > >
> > > > > Ethernet adapter Network Connection 2:
> > > > >
> > > > > Connection-specific DNS Suffix . :
> > > > > Description . . . . . . . . . . . : Intel(R) PRO/100 S Server
> Adapter
> > > > > Physical Address. . . . . . . . . : 00-0E-0C-6D-53-E6
> > > > > DHCP Enabled. . . . . . . . . . . : No
> > > > > IP Address. . . . . . . . . . . . : 192.168.1.10
> > > > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > > > Default Gateway . . . . . . . . . : 192.168.1.2
> > > > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > > > Primary WINS Server . . . . . . . : 192.168.16.2
> > > > > NetBIOS over Tcpip. . . . . . . . : Disabled
> > > > >
> > > > > Ethernet adapter Server Local Area Connection:
> > > > >
> > > > > Connection-specific DNS Suffix . :
> > > > > Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network
> > > > > Connection
> > > > > Physical Address. . . . . . . . . : 00-11-43-EC-B3-21
> > > > > DHCP Enabled. . . . . . . . . . . : No
> > > > > IP Address. . . . . . . . . . . . : 192.168.16.2
> > > > > Subnet Mask . . . . . . . . . . . : 255.255.255.0
> > > > > Default Gateway . . . . . . . . . :
> > > > > DNS Servers . . . . . . . . . . . : 192.168.16.2
> > > > > Primary WINS Server . . . . . . . : 192.168.16.2
> > > > >
> > > > > I have tried the DNS server both with and without the ISP's
> forwarders
> > > and
> > > > > without to no avail. (and have also tried switching off the client
> > > > computer'
> > > > > NIC's power management...)
> > > > >
> > > > > Any help greatly appreciated
> > > > >
> > > > > Regards
> > > > >
> > > > > Johnny
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> >
> >
>
>

To eliminate fragmentation through the NAT device, you may need to adjust
MTU size.

TCP/IP and NBT Configuration Parameters for Windows 2000 or Windows NT
http://support.microsoft.com/default...;EN-US;q120642

TCP/IP and NBT Configuration Parameters for Windows XP
http://support.microsoft.com/default...b;EN-US;314053

--
Todd J Heron, MCSE
Windows Server 2003/2000/NT; CCA
----------------------------------------------------------------------------
This posting is provided "as is" with no warranties and confers no rights

Hi Todd
Thanks for replying
Have increased MTU on the modem to 1500, does it have to be increased in the
registries of the server and all the client computers? (sounds a little
extreme...they are all new machines)

"Todd J Heron" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> To eliminate fragmentation through the NAT device, you may need to adjust
> MTU size.
>
> TCP/IP and NBT Configuration Parameters for Windows 2000 or Windows NT
> http://support.microsoft.com/default...;EN-US;q120642
>
> TCP/IP and NBT Configuration Parameters for Windows XP
> http://support.microsoft.com/default...b;EN-US;314053
>
> --
> Todd J Heron, MCSE
> Windows Server 2003/2000/NT; CCA
> --------------------------------------------------------------------------
--
> This posting is provided "as is" with no warranties and confers no rights
>

MTU adjustments may well be the answer to your problem. However, because
your client machines work OK when connected directly to the modem, we can
assume that the bottleneck is the server. ie. packets are being fragmented
as they pass through the software router created on the server. Therefore,
your most effective adjustments are likely to be made on the server itself.
You could also try reducing MTU on the clients. For a guide to calculating
appropriate settings, see:

http://www.speedguide.net/read_articles.php?id=156

Dog Sherman
MCSE, MCSA, MCP+I, MVP

"JohnnyD" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hi Todd
> Thanks for replying
> Have increased MTU on the modem to 1500, does it have to be increased in
the
> registries of the server and all the client computers? (sounds a little
> extreme...they are all new machines)
>
> "Todd J Heron" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
> > To eliminate fragmentation through the NAT device, you may need to
adjust
> > MTU size.
> >
> > TCP/IP and NBT Configuration Parameters for Windows 2000 or Windows NT
> > http://support.microsoft.com/default...;EN-US;q120642
> >
> > TCP/IP and NBT Configuration Parameters for Windows XP
> > http://support.microsoft.com/default...b;EN-US;314053
> >
> > --
> > Todd J Heron, MCSE
> > Windows Server 2003/2000/NT; CCA
>
> --------------------------------------------------------------------------
> --
> > This posting is provided "as is" with no warranties and confers no
rights
> >
>
>