One computer on 2 networks

Hi All,

I have a computer that has 2 NICs, each connecting to a different network.

NIC1:
172.30.204.100 Static
255.225.252.0

NIC2:
192.168.1.10 Static
255.255.255.0
Def Gateway: 192.168.1.254

Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
servers in the intranet, a file server, a POP3 server. Those resources are
all 172.x.x.x. NOT all of them are 172.30.x.x

Through NIC2, I need to have access to the internet.

Access to internet through NIC2, is working well but, to have access to the
LAN resources, through NIC1, I've been having to do manual route add, for
each resource. Resources are added constantly. All I know of these
resources, is that they all start with 172.... (this looks like a Cert
exam!! :-D ) . My question: Is what I've been doing (Route Add), the
correct solution or, is there a better way to do it? There's probably more
information missing here (my apologies for that). If that's the case,
please, let me know what other information is needed, to find an answer.

One other thing: When I tried to enter a default gateway for NIC1, while
keeping the one for NIC2, I got an error message stating that I should only
have one default gateway and, effectively, network communication fails, if I
keep both.

Thank you all for the help. Have a great day,

Frank

Hey Frank,

For your internal networking issue, the deal is that your mask
(255.255.252.0) says that subnetting your class B network (172.30.0.0)
into 6 subnets. i.e. 172.30.0.0 is a different network than 172.30.8.0.
And you say that you have hosts in networks that aren't even in
172.30.0.0 space.

Now when you cross over any network boundary, you need to have a router
(aka gateway.) When you try to go from 172.30.0.5 to 172.30.16.7 or
172.22.0.129, your machine is going to know (because of the mask) that
those machines are not on its network. Since they aren't on its network,
it doesn't know how to find them, unless you tell it.

There are effectively two ways you can tell it:
1. Adding static routes for your other network, and pointing them toward
the appropriate router(s) to reach them.

2. Setting your default route to the local router, and let it direct
your traffic.

In your case, you can't do the latter because you can only have one
default route on a machine, and yours must point to the Internet gateway.

Probably the easiest thing to do for you would be to add a route to
172.16.0.0 255.240.0.0 and point it to your local router on the NIC1
side. (I'm assuming, of course, that you have one router to which you
direct all the internal network routes anyway.)

Good luck!

grep

John Francisco Williams wrote:
> Hi All,
>
> I have a computer that has 2 NICs, each connecting to a different network.
>
> NIC1:
> 172.30.204.100 Static
> 255.225.252.0
>
> NIC2:
> 192.168.1.10 Static
> 255.255.255.0
> Def Gateway: 192.168.1.254
>
> Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
> servers in the intranet, a file server, a POP3 server. Those resources are
> all 172.x.x.x. NOT all of them are 172.30.x.x
>
> Through NIC2, I need to have access to the internet.
>
> Access to internet through NIC2, is working well but, to have access to the
> LAN resources, through NIC1, I've been having to do manual route add, for
> each resource. Resources are added constantly. All I know of these
> resources, is that they all start with 172.... (this looks like a Cert
> exam!! :-D ) . My question: Is what I've been doing (Route Add), the
> correct solution or, is there a better way to do it? There's probably more
> information missing here (my apologies for that). If that's the case,
> please, let me know what other information is needed, to find an answer.
>
> One other thing: When I tried to enter a default gateway for NIC1, while
> keeping the one for NIC2, I got an error message stating that I should only
> have one default gateway and, effectively, network communication fails, if I
> keep both.
>
> Thank you all for the help. Have a great day,
>
> Frank
>
>

Grep,

Thanks a lot for your help. The default gateway in the LAN where NIC1 is, is
172.30.204.100. Is that the one you suggest me to use? Sorry to bother: How
exactly would the Route Add sentence be?

Thanks again,

Frank

"grep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Hey Frank,
>
> For your internal networking issue, the deal is that your mask
> (255.255.252.0) says that subnetting your class B network (172.30.0.0)
> into 6 subnets. i.e. 172.30.0.0 is a different network than 172.30.8.0.
> And you say that you have hosts in networks that aren't even in 172.30.0.0
> space.
>
> Now when you cross over any network boundary, you need to have a router
> (aka gateway.) When you try to go from 172.30.0.5 to 172.30.16.7 or
> 172.22.0.129, your machine is going to know (because of the mask) that
> those machines are not on its network. Since they aren't on its network,
> it doesn't know how to find them, unless you tell it.
>
> There are effectively two ways you can tell it:
> 1. Adding static routes for your other network, and pointing them toward
> the appropriate router(s) to reach them.
>
> 2. Setting your default route to the local router, and let it direct your
> traffic.
>
> In your case, you can't do the latter because you can only have one
> default route on a machine, and yours must point to the Internet gateway.
>
> Probably the easiest thing to do for you would be to add a route to
> 172.16.0.0 255.240.0.0 and point it to your local router on the NIC1 side.
> (I'm assuming, of course, that you have one router to which you direct all
> the internal network routes anyway.)
>
> Good luck!
>
> grep
>
> John Francisco Williams wrote:
>> Hi All,
>>
>> I have a computer that has 2 NICs, each connecting to a different
>> network.
>>
>> NIC1:
>> 172.30.204.100 Static
>> 255.225.252.0
>>
>> NIC2:
>> 192.168.1.10 Static
>> 255.255.255.0
>> Def Gateway: 192.168.1.254
>>
>> Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
>> servers in the intranet, a file server, a POP3 server. Those resources
>> are all 172.x.x.x. NOT all of them are 172.30.x.x
>>
>> Through NIC2, I need to have access to the internet.
>>
>> Access to internet through NIC2, is working well but, to have access to
>> the LAN resources, through NIC1, I've been having to do manual route add,
>> for each resource. Resources are added constantly. All I know of these
>> resources, is that they all start with 172.... (this looks like a Cert
>> exam!! :-D ) . My question: Is what I've been doing (Route Add), the
>> correct solution or, is there a better way to do it? There's probably
>> more information missing here (my apologies for that). If that's the
>> case, please, let me know what other information is needed, to find an
>> answer.
>>
>> One other thing: When I tried to enter a default gateway for NIC1, while
>> keeping the one for NIC2, I got an error message stating that I should
>> only have one default gateway and, effectively, network communication
>> fails, if I keep both.
>>
>> Thank you all for the help. Have a great day,
>>
>> Frank
>>

You can only have one default gateway, and that should be out to the
Internet. The gateway setting on the 172.30 NIC should be blank.

To get traffic for 172. addresses to a different router you should only
need one static route. If they were all 172.30 addresses you would use

route add -p 172.30.0.0 255.255.0.0 <router IP>

If they are not all 172.30 you need to use a shorter network mask (so
that it covers more addresses). To redirect all packets beginning with 172
you would use

route add -p 172.0.0.0 255.0.0.0 <router IP>

"John Francisco Williams" <(E-Mail Removed)> wrote in
message news:%(E-Mail Removed)...
> Grep,
>
> Thanks a lot for your help. The default gateway in the LAN where NIC1 is,
> is 172.30.204.100. Is that the one you suggest me to use? Sorry to bother:
> How exactly would the Route Add sentence be?
>
> Thanks again,
>
> Frank
>
> "grep" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> Hey Frank,
>>
>> For your internal networking issue, the deal is that your mask
>> (255.255.252.0) says that subnetting your class B network (172.30.0.0)
>> into 6 subnets. i.e. 172.30.0.0 is a different network than 172.30.8.0.
>> And you say that you have hosts in networks that aren't even in
>> 172.30.0.0 space.
>>
>> Now when you cross over any network boundary, you need to have a router
>> (aka gateway.) When you try to go from 172.30.0.5 to 172.30.16.7 or
>> 172.22.0.129, your machine is going to know (because of the mask) that
>> those machines are not on its network. Since they aren't on its network,
>> it doesn't know how to find them, unless you tell it.
>>
>> There are effectively two ways you can tell it:
>> 1. Adding static routes for your other network, and pointing them toward
>> the appropriate router(s) to reach them.
>>
>> 2. Setting your default route to the local router, and let it direct your
>> traffic.
>>
>> In your case, you can't do the latter because you can only have one
>> default route on a machine, and yours must point to the Internet gateway.
>>
>> Probably the easiest thing to do for you would be to add a route to
>> 172.16.0.0 255.240.0.0 and point it to your local router on the NIC1
>> side. (I'm assuming, of course, that you have one router to which you
>> direct all the internal network routes anyway.)
>>
>> Good luck!
>>
>> grep
>>
>> John Francisco Williams wrote:
>>> Hi All,
>>>
>>> I have a computer that has 2 NICs, each connecting to a different
>>> network.
>>>
>>> NIC1:
>>> 172.30.204.100 Static
>>> 255.225.252.0
>>>
>>> NIC2:
>>> 192.168.1.10 Static
>>> 255.255.255.0
>>> Def Gateway: 192.168.1.254
>>>
>>> Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
>>> servers in the intranet, a file server, a POP3 server. Those resources
>>> are all 172.x.x.x. NOT all of them are 172.30.x.x
>>>
>>> Through NIC2, I need to have access to the internet.
>>>
>>> Access to internet through NIC2, is working well but, to have access to
>>> the LAN resources, through NIC1, I've been having to do manual route
>>> add, for each resource. Resources are added constantly. All I know of
>>> these resources, is that they all start with 172.... (this looks like a
>>> Cert exam!! :-D ) . My question: Is what I've been doing (Route Add),
>>> the correct solution or, is there a better way to do it? There's
>>> probably more information missing here (my apologies for that). If
>>> that's the case, please, let me know what other information is needed,
>>> to find an answer.
>>>
>>> One other thing: When I tried to enter a default gateway for NIC1, while
>>> keeping the one for NIC2, I got an error message stating that I should
>>> only have one default gateway and, effectively, network communication
>>> fails, if I keep both.
>>>
>>> Thank you all for the help. Have a great day,
>>>
>>> Frank
>>>
>

In Frank's case, since there are multiple 172 networks involved, it
would be easiest to do the latter, but Bill, be mindful of the RFC which
creates the 172.x.x.x private network (RFC-1918, if you're interested).
Not *all* 172 networks are private - only the range between 16 and 31.
By using 172.0.0.0 with the mask 255.0.0.0, Frank will be prventing
himself from getting to an address at, say, 172.45.72.102 because it
will try to route him to his internal router.

So the correct route add syntax would be:

route add -p 172.16.0.0 255.240.0.0 172.30.204.100

Bill is right about leaving your default gateway as your Internet
router, on NIC2.

grep

Bill Grant wrote:
> You can only have one default gateway, and that should be out to the
> Internet. The gateway setting on the 172.30 NIC should be blank.
>
> To get traffic for 172. addresses to a different router you should only
> need one static route. If they were all 172.30 addresses you would use
>
> route add -p 172.30.0.0 255.255.0.0 <router IP>
>
> If they are not all 172.30 you need to use a shorter network mask (so
> that it covers more addresses). To redirect all packets beginning with 172
> you would use
>
> route add -p 172.0.0.0 255.0.0.0 <router IP>
>
> "John Francisco Williams" <(E-Mail Removed)> wrote in
> message news:%(E-Mail Removed)...
>
>>Grep,
>>
>>Thanks a lot for your help. The default gateway in the LAN where NIC1 is,
>>is 172.30.204.100. Is that the one you suggest me to use? Sorry to bother:
>>How exactly would the Route Add sentence be?
>>
>>Thanks again,
>>
>>Frank
>>
>>"grep" <(E-Mail Removed)> wrote in message
>>news:(E-Mail Removed)...
>>
>>>Hey Frank,
>>>
>>>For your internal networking issue, the deal is that your mask
>>>(255.255.252.0) says that subnetting your class B network (172.30.0.0)
>>>into 6 subnets. i.e. 172.30.0.0 is a different network than 172.30.8.0.
>>>And you say that you have hosts in networks that aren't even in
>>>172.30.0.0 space.
>>>
>>>Now when you cross over any network boundary, you need to have a router
>>>(aka gateway.) When you try to go from 172.30.0.5 to 172.30.16.7 or
>>>172.22.0.129, your machine is going to know (because of the mask) that
>>>those machines are not on its network. Since they aren't on its network,
>>>it doesn't know how to find them, unless you tell it.
>>>
>>>There are effectively two ways you can tell it:
>>>1. Adding static routes for your other network, and pointing them toward
>>>the appropriate router(s) to reach them.
>>>
>>>2. Setting your default route to the local router, and let it direct your
>>>traffic.
>>>
>>>In your case, you can't do the latter because you can only have one
>>>default route on a machine, and yours must point to the Internet gateway.
>>>
>>>Probably the easiest thing to do for you would be to add a route to
>>>172.16.0.0 255.240.0.0 and point it to your local router on the NIC1
>>>side. (I'm assuming, of course, that you have one router to which you
>>>direct all the internal network routes anyway.)
>>>
>>>Good luck!
>>>
>>>grep
>>>
>>>John Francisco Williams wrote:
>>>
>>>>Hi All,
>>>>
>>>>I have a computer that has 2 NICs, each connecting to a different
>>>>network.
>>>>
>>>>NIC1:
>>>>172.30.204.100 Static
>>>>255.225.252.0
>>>>
>>>>NIC2:
>>>>192.168.1.10 Static
>>>>255.255.255.0
>>>>Def Gateway: 192.168.1.254
>>>>
>>>>Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
>>>>servers in the intranet, a file server, a POP3 server. Those resources
>>>>are all 172.x.x.x. NOT all of them are 172.30.x.x
>>>>
>>>>Through NIC2, I need to have access to the internet.
>>>>
>>>>Access to internet through NIC2, is working well but, to have access to
>>>>the LAN resources, through NIC1, I've been having to do manual route
>>>>add, for each resource. Resources are added constantly. All I know of
>>>>these resources, is that they all start with 172.... (this looks like a
>>>>Cert exam!! :-D ) . My question: Is what I've been doing (Route Add),
>>>>the correct solution or, is there a better way to do it? There's
>>>>probably more information missing here (my apologies for that). If
>>>>that's the case, please, let me know what other information is needed,
>>>>to find an answer.
>>>>
>>>>One other thing: When I tried to enter a default gateway for NIC1, while
>>>>keeping the one for NIC2, I got an error message stating that I should
>>>>only have one default gateway and, effectively, network communication
>>>>fails, if I keep both.
>>>>
>>>>Thank you all for the help. Have a great day,
>>>>
>>>>Frank
>>>>
>>
>
>

Hi Guys,

I think a question should have been asked at the beginning.
Why is there two nics in the server to begin with? Normally this is just
flatout a bad design,...there is pretty much never ever a need for two nics in a
server unless there is Nic teaming being done or the server is acting as a LAN
Router or Internet Firewall/Proxy.

If the goal is to have a clean, properly designed, and effiecient network that
is the first thing that should be looked at.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft, or
anyone else associated with me, including my cats.
-----------------------------------------------------

"grep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> In Frank's case, since there are multiple 172 networks involved, it would be
> easiest to do the latter, but Bill, be mindful of the RFC which creates the
> 172.x.x.x private network (RFC-1918, if you're interested). Not *all* 172
> networks are private - only the range between 16 and 31. By using 172.0.0.0
> with the mask 255.0.0.0, Frank will be prventing himself from getting to an
> address at, say, 172.45.72.102 because it will try to route him to his
> internal router.
>
> So the correct route add syntax would be:
>
> route add -p 172.16.0.0 255.240.0.0 172.30.204.100
>
> Bill is right about leaving your default gateway as your Internet router, on
> NIC2.
>
> grep
>
> Bill Grant wrote:
>> You can only have one default gateway, and that should be out to the
>> Internet. The gateway setting on the 172.30 NIC should be blank.
>>
>> To get traffic for 172. addresses to a different router you should only
>> need one static route. If they were all 172.30 addresses you would use
>>
>> route add -p 172.30.0.0 255.255.0.0 <router IP>
>>
>> If they are not all 172.30 you need to use a shorter network mask (so
>> that it covers more addresses). To redirect all packets beginning with 172
>> you would use
>>
>> route add -p 172.0.0.0 255.0.0.0 <router IP>
>>
>> "John Francisco Williams" <(E-Mail Removed)> wrote in
>> message news:%(E-Mail Removed)...
>>
>>>Grep,
>>>
>>>Thanks a lot for your help. The default gateway in the LAN where NIC1 is, is
>>>172.30.204.100. Is that the one you suggest me to use? Sorry to bother: How
>>>exactly would the Route Add sentence be?
>>>
>>>Thanks again,
>>>
>>>Frank
>>>
>>>"grep" <(E-Mail Removed)> wrote in message
>>>news:(E-Mail Removed)...
>>>
>>>>Hey Frank,
>>>>
>>>>For your internal networking issue, the deal is that your mask
>>>>(255.255.252.0) says that subnetting your class B network (172.30.0.0) into
>>>>6 subnets. i.e. 172.30.0.0 is a different network than 172.30.8.0. And you
>>>>say that you have hosts in networks that aren't even in 172.30.0.0 space.
>>>>
>>>>Now when you cross over any network boundary, you need to have a router (aka
>>>>gateway.) When you try to go from 172.30.0.5 to 172.30.16.7 or 172.22.0.129,
>>>>your machine is going to know (because of the mask) that those machines are
>>>>not on its network. Since they aren't on its network, it doesn't know how to
>>>>find them, unless you tell it.
>>>>
>>>>There are effectively two ways you can tell it:
>>>>1. Adding static routes for your other network, and pointing them toward the
>>>>appropriate router(s) to reach them.
>>>>
>>>>2. Setting your default route to the local router, and let it direct your
>>>>traffic.
>>>>
>>>>In your case, you can't do the latter because you can only have one default
>>>>route on a machine, and yours must point to the Internet gateway.
>>>>
>>>>Probably the easiest thing to do for you would be to add a route to
>>>>172.16.0.0 255.240.0.0 and point it to your local router on the NIC1 side.
>>>>(I'm assuming, of course, that you have one router to which you direct all
>>>>the internal network routes anyway.)
>>>>
>>>>Good luck!
>>>>
>>>>grep
>>>>
>>>>John Francisco Williams wrote:
>>>>
>>>>>Hi All,
>>>>>
>>>>>I have a computer that has 2 NICs, each connecting to a different network.
>>>>>
>>>>>NIC1:
>>>>>172.30.204.100 Static
>>>>>255.225.252.0
>>>>>
>>>>>NIC2:
>>>>>192.168.1.10 Static
>>>>>255.255.255.0
>>>>>Def Gateway: 192.168.1.254
>>>>>
>>>>>Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
>>>>>servers in the intranet, a file server, a POP3 server. Those resources are
>>>>>all 172.x.x.x. NOT all of them are 172.30.x.x
>>>>>
>>>>>Through NIC2, I need to have access to the internet.
>>>>>
>>>>>Access to internet through NIC2, is working well but, to have access to the
>>>>>LAN resources, through NIC1, I've been having to do manual route add, for
>>>>>each resource. Resources are added constantly. All I know of these
>>>>>resources, is that they all start with 172.... (this looks like a Cert
>>>>>exam!! :-D ) . My question: Is what I've been doing (Route Add), the
>>>>>correct solution or, is there a better way to do it? There's probably more
>>>>>information missing here (my apologies for that). If that's the case,
>>>>>please, let me know what other information is needed, to find an answer.
>>>>>
>>>>>One other thing: When I tried to enter a default gateway for NIC1, while
>>>>>keeping the one for NIC2, I got an error message stating that I should only
>>>>>have one default gateway and, effectively, network communication fails, if
>>>>>I keep both.
>>>>>
>>>>>Thank you all for the help. Have a great day,
>>>>>
>>>>>Frank
>>>>>
>>>
>>

I agree, Phillip. It's not necessarily the best design. But I wasn't
asking that question. I was just answering the IP question as it was
asked!

grep

Phillip Windell wrote:
> Hi Guys,
>
> I think a question should have been asked at the beginning.
> Why is there two nics in the server to begin with? Normally this is just
> flatout a bad design,...there is pretty much never ever a need for two nics in a
> server unless there is Nic teaming being done or the server is acting as a LAN
> Router or Internet Firewall/Proxy.
>
> If the goal is to have a clean, properly designed, and effiecient network that
> is the first thing that should be looked at.
>

"grep" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
>I agree, Phillip. It's not necessarily the best design. But I wasn't asking
>that question. I was just answering the IP question as it was asked!

No problem, I just always seem to enjoy being the "doom and gloom" guy :-)

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft, or
anyone else associated with me, including my cats.
-----------------------------------------------------

Thank you so much everybody for all your help, I will then add the route as
suggested:

route add -p 172.16.0.0 255.240.0.0 172.30.204.100

Have a great day,

Frank

"John Francisco Williams" <(E-Mail Removed)> wrote in
message news:(E-Mail Removed)...
> Hi All,
>
> I have a computer that has 2 NICs, each connecting to a different network.
>
> NIC1:
> 172.30.204.100 Static
> 255.225.252.0
>
> NIC2:
> 192.168.1.10 Static
> 255.255.255.0
> Def Gateway: 192.168.1.254
>
> Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
> servers in the intranet, a file server, a POP3 server. Those resources are
> all 172.x.x.x. NOT all of them are 172.30.x.x
>
> Through NIC2, I need to have access to the internet.
>
> Access to internet through NIC2, is working well but, to have access to
> the LAN resources, through NIC1, I've been having to do manual route add,
> for each resource. Resources are added constantly. All I know of these
> resources, is that they all start with 172.... (this looks like a Cert
> exam!! :-D ) . My question: Is what I've been doing (Route Add), the
> correct solution or, is there a better way to do it? There's probably more
> information missing here (my apologies for that). If that's the case,
> please, let me know what other information is needed, to find an answer.
>
> One other thing: When I tried to enter a default gateway for NIC1, while
> keeping the one for NIC2, I got an error message stating that I should
> only have one default gateway and, effectively, network communication
> fails, if I keep both.
>
> Thank you all for the help. Have a great day,
>
> Frank
>
>

That is very close. The route command should actually have the address
of the "next hop" router at the end, not the address of your NIC. The
machine can work out for itself which interface to use. It needs to know the
address of the router to which the traffic needs to be sent to reach other
machines on the 172. network. This is probably the address you used to
specify as your default gateway on the 172.30 NIC.

"John Francisco Williams" <(E-Mail Removed)> wrote in
message news:(E-Mail Removed)...
> Thank you so much everybody for all your help, I will then add the route
> as suggested:
>
> route add -p 172.16.0.0 255.240.0.0 172.30.204.100
>
> Have a great day,
>
> Frank
>
> "John Francisco Williams" <(E-Mail Removed)> wrote in
> message news:(E-Mail Removed)...
>> Hi All,
>>
>> I have a computer that has 2 NICs, each connecting to a different
>> network.
>>
>> NIC1:
>> 172.30.204.100 Static
>> 255.225.252.0
>>
>> NIC2:
>> 192.168.1.10 Static
>> 255.255.255.0
>> Def Gateway: 192.168.1.254
>>
>> Through NIC1, I need to have access to LAN resources: 2 printers, 2 web
>> servers in the intranet, a file server, a POP3 server. Those resources
>> are all 172.x.x.x. NOT all of them are 172.30.x.x
>>
>> Through NIC2, I need to have access to the internet.
>>
>> Access to internet through NIC2, is working well but, to have access to
>> the LAN resources, through NIC1, I've been having to do manual route add,
>> for each resource. Resources are added constantly. All I know of these
>> resources, is that they all start with 172.... (this looks like a Cert
>> exam!! :-D ) . My question: Is what I've been doing (Route Add), the
>> correct solution or, is there a better way to do it? There's probably
>> more information missing here (my apologies for that). If that's the
>> case, please, let me know what other information is needed, to find an
>> answer.
>>
>> One other thing: When I tried to enter a default gateway for NIC1, while
>> keeping the one for NIC2, I got an error message stating that I should
>> only have one default gateway and, effectively, network communication
>> fails, if I keep both.
>>
>> Thank you all for the help. Have a great day,
>>
>> Frank
>>
>>
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