Error message

Hi Everyone,

I wonder if any of you can help me to solve a silly problem on my home net.

I have two machines running XP, connected as follows:

[ADSL router] -> ethernet cable > [PC1] > corssover cable > [PC2]


Configuration of the system:

1. The router, a Netgear DM602, is configured - I think - correctly as
follows:

DHCP Server enabled, start 192.168.0.2, end 192.168.0.253

LAN TCP/IP setup 192.168.0.1 (which is the LAN address of the router),
subnet 255.255.255.0 (which is in my opinion correct).

There are some settings for the USB setup, but given that I will not use it
as a modem I will skip these details.

2. [PC1] equipped with two ethernet ports, one connected to the router and
the other to [PC2], both configured to obtain IP addresses automatically,
not firewalled.

3. [PC2] equipped with one ethernet, connected to [PC1] through a crossover
cable, configured to obtain IP address automatically, not firewalled.

What happens?

[PC1] can connect to the internet no problems, all sort of services work, I
have no problems whatsoever. The two PCs also connect with each other and
have no problems in sharing folders, printers, etc..
But [PC2] cannot connect to the internet through [PC1] and the router.

The reason why [PC2] does not connect, is that I cannot share the ethernet
port in order to be shared within my LAN, and everytime I try the system
returns an error message that reads: "Internet connection sharing cannot be
enabled. A LAN connection is already configured with the IP address that is
required for automatic IP addressing."

I digged into the problem, and had a look at the current IP assignments,
which are:

Router:
IP 192.168.0.1, subnet mask 255.255.255.0

[PC1], towards the router:
IP 192.168.0.2, subnet mask, default gateway (autometically setup by the
system itself) 192.168.0.1

[PC1], towards [PC2]:
IP 169.254.19.217, subnet 255.255.0.0, no default gateway

[PC2]:
IP169.254.18.49, subnet 255.255.0.0, no default gateway

Now, the first thing I thought might be wrong is the difference between the
subnet mask that [PC1] and the router belong to, and the subnet mask of the
network that connect [PC1] and [PC2]. I tried to modify the router setup and
apply a 255.255.0.0 subnet mask, but I still have the same problem.

I have been reading around and the more I read the more I feel confused...
can anyone please tell me what I am doing wrong? I think it must be
something silly that I can't see for some reasons.

Do I have to setup all the IPs manually and allocate fixed addresses?

Thank you for your help.

M.

"Motorcyclesaur" <(E-Mail Removed)> wrote in message
news:c17c5e$1f60v5$(E-Mail Removed)...
> Hi Everyone,
>
> I wonder if any of you can help me to solve a silly problem on my home
net.
>
> I have two machines running XP, connected as follows:
>
> [ADSL router] -> ethernet cable > [PC1] > corssover cable > [PC2]
>
>
> Configuration of the system:
>
> 1. The router, a Netgear DM602, is configured - I think - correctly as
> follows:
>
> DHCP Server enabled, start 192.168.0.2, end 192.168.0.253
>
> LAN TCP/IP setup 192.168.0.1 (which is the LAN address of the router),
> subnet 255.255.255.0 (which is in my opinion correct).
>
> There are some settings for the USB setup, but given that I will not use
it
> as a modem I will skip these details.
>
> 2. [PC1] equipped with two ethernet ports, one connected to the router and
> the other to [PC2], both configured to obtain IP addresses automatically,
> not firewalled.
>
> 3. [PC2] equipped with one ethernet, connected to [PC1] through a
crossover
> cable, configured to obtain IP address automatically, not firewalled.
>
> What happens?
>
> [PC1] can connect to the internet no problems, all sort of services work,
I
> have no problems whatsoever. The two PCs also connect with each other and
> have no problems in sharing folders, printers, etc..
> But [PC2] cannot connect to the internet through [PC1] and the router.
>
> The reason why [PC2] does not connect, is that I cannot share the ethernet
> port in order to be shared within my LAN, and everytime I try the system
> returns an error message that reads: "Internet connection sharing cannot
be
> enabled. A LAN connection is already configured with the IP address that
is
> required for automatic IP addressing."
>
> I digged into the problem, and had a look at the current IP assignments,
> which are:
>
> Router:
> IP 192.168.0.1, subnet mask 255.255.255.0
>
> [PC1], towards the router:
> IP 192.168.0.2, subnet mask, default gateway (autometically setup by the
> system itself) 192.168.0.1
>
> [PC1], towards [PC2]:
> IP 169.254.19.217, subnet 255.255.0.0, no default gateway
>
> [PC2]:
> IP169.254.18.49, subnet 255.255.0.0, no default gateway
>
> Now, the first thing I thought might be wrong is the difference between
the
> subnet mask that [PC1] and the router belong to, and the subnet mask of
the
> network that connect [PC1] and [PC2]. I tried to modify the router setup
and
> apply a 255.255.0.0 subnet mask, but I still have the same problem.
>
> I have been reading around and the more I read the more I feel confused...
> can anyone please tell me what I am doing wrong? I think it must be
> something silly that I can't see for some reasons.
>
> Do I have to setup all the IPs manually and allocate fixed addresses?
>

That will be simplest - the non router interface on PC1, and the interface
on PC2 have auto configured themselves, the DHCP from the router isn't
passing through from the router interface. I don't have XP so not sure how
you would get this to work asides from trying setting the addresses manually
as you suggest, although even this my not work! Also, if you have shared the
router lan connection on pc1, this will effectively have set up a dhcp
server on that interface, but at the same time its trying to be a dhcp
client from the router... you may find that's why the other machines have
169.254.xxxxx addresses, as the ICS built in dhcp server has switched itself
off...?
The other option is to purchase a cheap hub/switch, plug it into the router
and then plug th two pc's into that. The advantages being a) its simpler,
and b) PC2 could get online without PC1 being on.

James

Motorcyclesaur wrote:

> What happens?
>
> [PC1] can connect to the internet no problems, all sort of services work, I
> have no problems whatsoever. The two PCs also connect with each other and
> have no problems in sharing folders, printers, etc..
> But [PC2] cannot connect to the internet through [PC1] and the router.
>
> The reason why [PC2] does not connect, is that I cannot share the ethernet
> port in order to be shared within my LAN, and everytime I try the system
> returns an error message that reads: "Internet connection sharing cannot be
> enabled. A LAN connection is already configured with the IP address that is
> required for automatic IP addressing."

When you enable ICS, ICS wants to set the LAN ip address to 192.168.0.1.
It can't do this as this network is already present on the external
interface of the ICS machine. You need to change the IP adress of the
router to, say 192.168.1.1. The ICS machine will then pick up a new IP
address on the 192.168.1 network and will then allow setting of the LAN
side to 192.168.0.1.

> I digged into the problem, and had a look at the current IP assignments,
> which are:
>
> Router:
> IP 192.168.0.1, subnet mask 255.255.255.0
>
> [PC1], towards the router:
> IP 192.168.0.2, subnet mask, default gateway (autometically setup by the
> system itself) 192.168.0.1
>
> [PC1], towards [PC2]:
> IP 169.254.19.217, subnet 255.255.0.0, no default gateway
>
> [PC2]:
> IP169.254.18.49, subnet 255.255.0.0, no default gateway

No dhcp server means that Windows allocates default address in the range
you are seeing.

> Now, the first thing I thought might be wrong is the difference between the
> subnet mask that [PC1] and the router belong to, and the subnet mask of the
> network that connect [PC1] and [PC2]. I tried to modify the router setup and
> apply a 255.255.0.0 subnet mask, but I still have the same problem.

If you don't change the network from something other than 192.168.0 you
will always have this problem, I think.

> I have been reading around and the more I read the more I feel confused...
> can anyone please tell me what I am doing wrong? I think it must be
> something silly that I can't see for some reasons.
>
> Do I have to setup all the IPs manually and allocate fixed addresses?

No, shouldn't need to but your ICS client machine may have to have your
ISP's DNS servers configured - sometimes ICS doesn't work properly with
DNS. This page shows how you would do this for an NTL connection:

<http://www.networklab.co.uk/cmodem/winxpics.html>

> Thank you for your help.

Hope it makes sense:-)

On Sat, 21 Feb 2004 10:33:18 +0000, Motorcyclesaur wrote:

> Hi Everyone,
>
> I wonder if any of you can help me to solve a silly problem on my home net.
>
> I have two machines running XP, connected as follows:
>
> [ADSL router] -> ethernet cable > [PC1] > corssover cable > [PC2]
>
>
> Configuration of the system:
>
> 1. The router, a Netgear DM602, is configured - I think - correctly as
> follows:
>
> DHCP Server enabled, start 192.168.0.2, end 192.168.0.253
>
> LAN TCP/IP setup 192.168.0.1 (which is the LAN address of the router),
> subnet 255.255.255.0 (which is in my opinion correct).
>
> There are some settings for the USB setup, but given that I will not use it
> as a modem I will skip these details.
>
> 2. [PC1] equipped with two ethernet ports, one connected to the router and
> the other to [PC2], both configured to obtain IP addresses automatically,
> not firewalled.
>
> 3. [PC2] equipped with one ethernet, connected to [PC1] through a crossover
> cable, configured to obtain IP address automatically, not firewalled.
>
> What happens?
>
> [PC1] can connect to the internet no problems, all sort of services work, I
> have no problems whatsoever. The two PCs also connect with each other and
> have no problems in sharing folders, printers, etc..
> But [PC2] cannot connect to the internet through [PC1] and the router.
>
> The reason why [PC2] does not connect, is that I cannot share the ethernet
> port in order to be shared within my LAN, and everytime I try the system
> returns an error message that reads: "Internet connection sharing cannot be
> enabled. A LAN connection is already configured with the IP address that is
> required for automatic IP addressing."
>
> I digged into the problem, and had a look at the current IP assignments,
> which are:
>
> Router:
> IP 192.168.0.1, subnet mask 255.255.255.0
>
> [PC1], towards the router:
> IP 192.168.0.2, subnet mask, default gateway (autometically setup by the
> system itself) 192.168.0.1
>
> [PC1], towards [PC2]:
> IP 169.254.19.217, subnet 255.255.0.0, no default gateway
>
> [PC2]:
> IP169.254.18.49, subnet 255.255.0.0, no default gateway
>
> Now, the first thing I thought might be wrong is the difference between the
> subnet mask that [PC1] and the router belong to, and the subnet mask of the
> network that connect [PC1] and [PC2]. I tried to modify the router setup and
> apply a 255.255.0.0 subnet mask, but I still have the same problem.
>
> I have been reading around and the more I read the more I feel confused...
> can anyone please tell me what I am doing wrong? I think it must be
> something silly that I can't see for some reasons.
>
> Do I have to setup all the IPs manually and allocate fixed addresses?
>
> Thank you for your help.
>
> M.


Is there any real reason why you want to feed the second PC via the first
PC?

The best option would be to buy an 8 port switch (around 20 pound or less)
Plug one port via a crossover cable into the router (which I presume has
only one ethernet port) and your two PC's directly into switch.

File and printer sharing will still work between the PC's and each will
have direct internet access via the router. No need to use ICS.

What you have at the moment is two networks. You will either have to use
ICS or a set of static routing tables in both the router and the first PC,
not an easy option unless you have a good understanding of IP routing.

Hope this helps, Graham

"Graham" <(E-Mail Removed)> wrote in message
news(E-Mail Removed)...

I attach my message, but I want to thank also James and Nig for their
contribution.

I tried a number of settings and there is no way of enabling the ICS. I
tried as suggested by Nig to change the IP of the router into 192.168.1.1
with 255.255.255.0 subnet, and then manually configure the interface to the
router as 192.168.0.1 with the same 255.255.0.0 subnet, but the system still
does not want to enable the ICS.

I also tried to both enable and disable the DHCP server facility in the
router and it still doesn't work.

I believe that I could disable the DHCP server function from the router and
assign manually the IP addresses as above and then use the interface on PC1
as a DHCP server for both the other interfaces on PC1 and PC2... but I still
have to work out how to do such a thing.

Basically, with the original configuration, the interface to the router is
managed by the router itself (DHCP assigned), whereas the other two
interfaces go on a different IP assigned as Automatic Private Address... and
as far as I understand that there is no chance for PC2 to access the
internet in this way.


> Is there any real reason why you want to feed the second PC via the first
> PC?

To tell you the truth, this system used to work perfectly when I had W2000
running on PC1 (PC2 always worked on XP).
Perhaps I have been just lucky when I set it up on the old system, but the
fact is that now I have a long crossover cable - that cost me a lot of work
to deploy under carpets and through the doors - that I would like use with
the new system... plus the fact that I get frustrated when I am defeated by
a computer :-)

There is something silly that I can't see and that it's driving me mad.

> The best option would be to buy an 8 port switch (around 20 pound or less)
> Plug one port via a crossover cable into the router (which I presume has
> only one ethernet port) and your two PC's directly into switch.

At this stage, I agree. I will reconnect with a new ISP shortly, and I will
take the chance to update the whole network. Can you suggest any good 4 or
8-port switch for that amount of money (£20)?

> File and printer sharing will still work between the PC's and each will
> have direct internet access via the router. No need to use ICS.

Do switches work as active firewall?

> What you have at the moment is two networks. You will either have to use
> ICS or a set of static routing tables in both the router and the first PC,
> not an easy option unless you have a good understanding of IP routing.

Well, as you all might have guessed, my understanding of IP routing is very
basic. However, I would be very happy if I could make it work this way, at
least for personal satisfaction.

Thank you again to everyone for your help.

M.

In article <c17c5e$1f60v5$(E-Mail Removed)>,
"Motorcyclesaur" (E-Mail Removed) says...
> Hi Everyone,
>
> I wonder if any of you can help me to solve a silly problem on my home net.
>
> I have two machines running XP, connected as follows:
>
> [ADSL router] -> ethernet cable > [PC1] > corssover cable > [PC2]
>
>
> Configuration of the system:
>
> 1. The router, a Netgear DM602, is configured - I think - correctly as
> follows:
>
> DHCP Server enabled, start 192.168.0.2, end 192.168.0.253
>
> LAN TCP/IP setup 192.168.0.1 (which is the LAN address of the router),
> subnet 255.255.255.0 (which is in my opinion correct).
>
> There are some settings for the USB setup, but given that I will not use it
> as a modem I will skip these details.
>
> 2. [PC1] equipped with two ethernet ports, one connected to the router and
> the other to [PC2], both configured to obtain IP addresses automatically,
> not firewalled.
>
> 3. [PC2] equipped with one ethernet, connected to [PC1] through a crossover
> cable, configured to obtain IP address automatically, not firewalled.
>
> What happens?
>
> [PC1] can connect to the internet no problems, all sort of services work, I
> have no problems whatsoever. The two PCs also connect with each other and
> have no problems in sharing folders, printers, etc..
> But [PC2] cannot connect to the internet through [PC1] and the router.
>
> The reason why [PC2] does not connect, is that I cannot share the ethernet
> port in order to be shared within my LAN, and everytime I try the system
> returns an error message that reads: "Internet connection sharing cannot be
> enabled. A LAN connection is already configured with the IP address that is
> required for automatic IP addressing."
>
> I digged into the problem, and had a look at the current IP assignments,
> which are:
>
> Router:
> IP 192.168.0.1, subnet mask 255.255.255.0
>
> [PC1], towards the router:
> IP 192.168.0.2, subnet mask, default gateway (autometically setup by the
> system itself) 192.168.0.1
>
> [PC1], towards [PC2]:
> IP 169.254.19.217, subnet 255.255.0.0, no default gateway
>
> [PC2]:
> IP169.254.18.49, subnet 255.255.0.0, no default gateway
>
> Now, the first thing I thought might be wrong is the difference between the
> subnet mask that [PC1] and the router belong to, and the subnet mask of the
> network that connect [PC1] and [PC2]. I tried to modify the router setup and
> apply a 255.255.0.0 subnet mask, but I still have the same problem.
>
> I have been reading around and the more I read the more I feel confused...
> can anyone please tell me what I am doing wrong? I think it must be
> something silly that I can't see for some reasons.
>
> Do I have to setup all the IPs manually and allocate fixed addresses?
>
The Internet Connection Sharing server wants to have the address
192.168.0.1, but the router has already taken it. If you set the router
IP address to 192.168.1.1, netmask 255.255.255.0 it should sort it out.

Motorcyclesaur wrote:
> "Graham" <(E-Mail Removed)> wrote in message
> news(E-Mail Removed)...
>
> I attach my message, but I want to thank also James and Nig for their
> contribution.
>
> I tried a number of settings and there is no way of enabling the ICS. I
> tried as suggested by Nig to change the IP of the router into 192.168.1.1
> with 255.255.255.0 subnet, and then manually configure the interface to the
> router as 192.168.0.1 with the same 255.255.0.0 subnet, but the system still
> does not want to enable the ICS.
>
> I also tried to both enable and disable the DHCP server facility in the
> router and it still doesn't work.

The theory is sound:-)

Set your router to 192.168.1.1, enable it's dhcp server and set the
external interface of your ICS machine to auto-config. This should give
this interface an address on the 192.168.1 network, depending on how you
have set up the dhcp scope on the router. The subnet mask for this net
is 255.255.255.0.

Now enable sharing on the router connected NIC. This will set the LAN
connected NIC to 192.168.0.1. On your other machine, again set it to
auto-config and it should then get it's IP address, gateway, etc.. from
the ICS machine. The subnet for this network will again be
255.255.255.0, but this should all be set autimagically anyway:-)

HTHSM:-)

"Nig" <(E-Mail Removed)> wrote in message
news:_f0_b.1764$(E-Mail Removed)...

> Set your router to 192.168.1.1, enable it's dhcp server and set the
> external interface of your ICS machine to auto-config. This should give
> this interface an address on the 192.168.1 network, depending on how you
> have set up the dhcp scope on the router. The subnet mask for this net
> is 255.255.255.0.

Ok, now I am one step forward and I understand (duh) that being the ICS
machine [PC1] the interface between the two networks (say net A between
router and [PC1], and net B between the two PCs), it is the NIC towards the
other PC (Net B) which has to be the DHCP server!

The achieved result is the following:

Net A, sub 255.255.255.0:

router 192.168.1.1;

[PC1] autoconfigured and (at last) shared:
IP assigned by router's DHCP server, 192.168.1.2; sub 255.255.255.0
Internet works perfectly on this system, no problems at all.

Net B, sub 255.255.255.0:

[PC1] NIC to Net B configured itself with a fixed IP 192.168.0.1, subnet
255.255.255.0

[PC2] NIC to Net B had IP assigned bz DHCP on [PC1] as 192.168.0.49 (ok),
sub 255.255.255.0.
Notably, DHCP Server, Default Gateway, and DNS server, are all set as
192.168.0.1 and my feelings were (before testing) that if the first is ok,
the Default Gateway *might* be wrong, and the DNS server is definitely
wrong.

A practical test prooved me right, as the two PCs now communicate but the
internet is still inaccessible from [PC2]. Given that both subnets are set
as 255.255.255.0, Net A and Net B (192.168.0.xxx and 192.168.1.xxx) are
completely separate from one another and I was expecting this to happen.

And now, the questions that should take me to the final solution to this
problem:

1. Does the Net B NIC have to be configured manually with a Default Gateway
and DNS Server? I don't think so, as it does not communicate with the
internet, but it is just the port to [PC2].

2. Does the NIC on PC2 have to be configured with a Default Gateway and DNS
Server? I think it does, but I am not sure of whether it has to be the [PC1]
NIC towards PC2 (192.168.0.1), or the NIC towards the router (now
192.168.1.2), or the router itself (192.168.1.1).
Logically thinking, I believe that being the two networks separate I won't
be able to use the router as a gateway for [PC2], let alone the DNS server
from my ISP (if I can't reach the router, how gan I go beyond?).

3. How can I tell [PC1] to route all the traffic between the internet and
[PC2] from Net A to Net B and vice versa?

> but this should all be set autimagically anyway:-)

Er... not in my case, but that's probably my lack of experience.

M.

"Motorcyclesaur" <(E-Mail Removed)> wrote in message
news:c1af7h$1fgm83$(E-Mail Removed)...
> "Nig" <(E-Mail Removed)> wrote in message
> news:_f0_b.1764$(E-Mail Removed)...
>
> > Set your router to 192.168.1.1, enable it's dhcp server and set the
> > external interface of your ICS machine to auto-config. This should give
> > this interface an address on the 192.168.1 network, depending on how you
> > have set up the dhcp scope on the router. The subnet mask for this net
> > is 255.255.255.0.
>
> Ok, now I am one step forward and I understand (duh) that being the ICS
> machine [PC1] the interface between the two networks (say net A between
> router and [PC1], and net B between the two PCs), it is the NIC towards
the
> other PC (Net B) which has to be the DHCP server!
>
> The achieved result is the following:
>
> Net A, sub 255.255.255.0:
>
> router 192.168.1.1;
>
> [PC1] autoconfigured and (at last) shared:
> IP assigned by router's DHCP server, 192.168.1.2; sub 255.255.255.0
> Internet works perfectly on this system, no problems at all.
>
> Net B, sub 255.255.255.0:
>
> [PC1] NIC to Net B configured itself with a fixed IP 192.168.0.1, subnet
> 255.255.255.0
>
> [PC2] NIC to Net B had IP assigned bz DHCP on [PC1] as 192.168.0.49 (ok),
> sub 255.255.255.0.
> Notably, DHCP Server, Default Gateway, and DNS server, are all set as
> 192.168.0.1 and my feelings were (before testing) that if the first is ok,
> the Default Gateway *might* be wrong, and the DNS server is definitely
> wrong.
>
> A practical test prooved me right, as the two PCs now communicate but the
> internet is still inaccessible from [PC2]. Given that both subnets are set
> as 255.255.255.0, Net A and Net B (192.168.0.xxx and 192.168.1.xxx) are
> completely separate from one another and I was expecting this to happen.
>
> And now, the questions that should take me to the final solution to this
> problem:
>
> 1. Does the Net B NIC have to be configured manually with a Default
Gateway
> and DNS Server? I don't think so, as it does not communicate with the
> internet, but it is just the port to [PC2].
>
> 2. Does the NIC on PC2 have to be configured with a Default Gateway and
DNS
> Server? I think it does, but I am not sure of whether it has to be the
[PC1]
> NIC towards PC2 (192.168.0.1), or the NIC towards the router (now
> 192.168.1.2), or the router itself (192.168.1.1).
> Logically thinking, I believe that being the two networks separate I won't
> be able to use the router as a gateway for [PC2], let alone the DNS server
> from my ISP (if I can't reach the router, how gan I go beyond?).
>
> 3. How can I tell [PC1] to route all the traffic between the internet and
> [PC2] from Net A to Net B and vice versa?
>
> > but this should all be set autimagically anyway:-)
>
> Er... not in my case, but that's probably my lack of experience.
>

Although that all seems a step forwards, I'm not quite convinced....
ICS is designed so you share the public interface, i.e. the internet side of
it. What you have done is share the private side of things by the sound if
it.

If I were you, I'd set your router to manually have an IP of 192.168.0.250,
and then turn off DHCP.
Set PC 1 so that the nic connected to the router is shared. This will
configure itself to 192.168.0.1. Once done, ensure the default gateway for
that is 192.168.0.250, and you may also need to enter your ISP's DNS server
addresses. (you will need to unshare nic2 on pc1 before doing this)
Reboot pc1, then pc2. Run ipconfig on each to make sure that nic2 on pc1 and
the nic on pc2 have got addresses in the 192.168.0.x range. That might
work... only thing is, you might need to check the gateways... not sure if
PC2 should point to the router IP or the 192.168.0.1... (I don't actually
use ICS!)
James

In article <c1af7h$1fgm83$(E-Mail Removed)>,
"Motorcyclesaur" (E-Mail Removed) says...
<snip>
> A practical test prooved me right, as the two PCs now communicate but the
> internet is still inaccessible from [PC2]. Given that both subnets are set
> as 255.255.255.0, Net A and Net B (192.168.0.xxx and 192.168.1.xxx) are
> completely separate from one another and I was expecting this to happen.

That's as it should be - ICS being a router it needs somewhere to route
from and somewhere to route to - they can't be on the same network.
>
> And now, the questions that should take me to the final solution to this
> problem:
>
> 1. Does the Net B NIC have to be configured manually with a Default Gateway
> and DNS Server? I don't think so, as it does not communicate with the
> internet, but it is just the port to [PC2].

Leave it on DHCP otherwise ICS can get upset.
>
> 2. Does the NIC on PC2 have to be configured with a Default Gateway and DNS
> Server? I think it does, but I am not sure of whether it has to be the [PC1]
> NIC towards PC2 (192.168.0.1), or the NIC towards the router (now
> 192.168.1.2), or the router itself (192.168.1.1).
> Logically thinking, I believe that being the two networks separate I won't
> be able to use the router as a gateway for [PC2], let alone the DNS server
> from my ISP (if I can't reach the router, how gan I go beyond?).

DHCP on the ICS machine should take care of that too - the ICS machine
is as far as the client machine needs to see (I'm assuming that ICS runs
a DNS proxy).
>
> 3. How can I tell [PC1] to route all the traffic between the internet and
> [PC2] from Net A to Net B and vice versa?
>
Have you tried just running the network setup wizard again?