have you tried winipcfg from command prompt then release ip?
enter the ip subnet and gateway as the primary connection on the second nic and see how you go
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Cannot ping ADSL router in external NIC
Hi there
I have a Windows 2000 Server SBE with two NICs, one connected to the internal network (IP address 192.168.254.250), the other connected to an ADSL router (IP address 192.168.254.252). The router has an IP address of 192.168.254.254.
I changed the IP address of the external NIC in error, and changed it back to 252, but since then the ISA Server has stopped working. I cannot ping the router (192.168.254.254) when it is connected to the external NIC. The default gateway is blank on the internal NIC, and has 192.168.254.254 on the external. I have had to plug the ADSL router back into the internal network and access it directly. I can ping it from the server when it is connected to the network, but not when connected to the external NIC. Any ideas?
Thanks
Craig
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Answers
snoopy13 - Thank you for your reply. I tried rebooting the router and it didn't work.
Maybe I can give you a little more information...
It basically boils down to the firewall doesn't work in ISA server. I have connected the router to the external NIC and they talk to each other, albeit not being able to ping. DNS queries are resolved and I can ping the internet (should I be able to do that from the server? I didn't think that was meant to be possible so I am sure something is not set up right). I can access the web from a client work station using by setting the proxy server in the Internet options, but cannot ping or access the internet any other way.
You might try looking in your host files and removing the erroneos IP address from all of them. Windows may still be using it to try to resolve the address and mucking up the network. Since you can ping from the laptop to the external, this is going to be a problem in Windows. You may also try removing the external NIC from the device manager and then do a scan for changes to load it back in. Usually, just changing the IP address will not affect things this way.
If your subnet mask is 255.255.255.0 then both the internal and external networks are using the same Class C network number 192.168.254.0. All packets for the network will go down one route, hence packets to 192.168.254.254 are probably going out on the internal network and hence you can see it when it is inside, but not when it is on the external link.
Assign a different network range for the external network, which will mean a different router IP address and a different external NIC IP address in the same network. If the router offers DHCP then you can get the server's external NIC address that way. 192.168.253.0 is a different Class C network number. In both network (192.168.254.0 and 192.168.254.0) the correct subnet mask should be 255.255.255.0.
In ISA you only need to define the local address table (LAT). You may have this currently defined as being something like 192.168.254.1 to 192.168.254.251 so that the external NIC and router are not seen by ISA as being local. Except it is not up to ISA to route packets externally, so they will still go down the wrong path, irrespective of ISA's LAT settings.
Hope this helps.
dr_dudd - I can't believe no one else noticed the almost certain obvious routing problem. To all other contributors, "For shame..."
dr_dudd just missed the fact that .252 should *never* work as an actual host address in your config, since if your netmask is /30 (which is the smallest block that you could possibly use and still hope to talk to other machines on that subnet), then your network address will be .252, and would be as such unusable as an actual IP address. If you netmask is wider than /30, then you will run into the routing problems that dr_dudd mentioned.
I still cannot believe the good Dr and myself are the only ones up on our subnet mathematics here - I would suggest the other four contributors here go back and do their homework...
The answer: Stop using the 192.168.254 subnet on your internal network - use one of the millions of other reserved subnets out there.
Cheers,
-Jon
I thought it couldn't be that obvious, I'm glad someone else has spotted it!
Jon, what is all this business with /30, I've seen this sort of thing bandied around in EE, but it is not a nomenclature that I have come across. I have tried to decode what 30 might mean in sub-net terms but it is all Greek to me.
Dr. Rabies Dudd.
Thanks for the explanation, so /30 means 255.255.255.252 in old money, or FF.FF.FF.FC. I don't see anywhere that this was mentioned as a subnet mask, so my assumption was that the network was not subnetted (is that a real word?) i.e. /24 in your terms or 255.255.255.0 or FF.FF.FF.00.
Catch me at http://www.drdudd.com nothinh to do with computers at all
Dr. 11000110011010101010110100
(Don't try to decode it, I just made it up)
I suggest you don't need two network cards in this server. I'd also suggest that you have a BT supplied Alcatel router, the configuration of which you have no control over. These routers are supplied with an IP address of 192.168.254.254 and are configured as DHCP servers. Obviously with NAT enabled.
If you do want to have two NICS you'll need to change your internal addressing scheme.
Hi Craig,
What is your subnet mask? If 255.255.255.0 then it will not work.
Win 2K does not come with bridging capability, only routing.
You may want to configure the router in different subnet.
So with subnet mask 255.255.255.0 your network should looks like this:
Internet------[router:192.
Your LAN is 192.168.254.0/25 (255.255.255.0)
Regards,
Judhi
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by: snoopy13Posted on 2003-05-28 at 06:20:16ID: 8597685
You can try unplugging the internal nic while the router is connected to the external nic, failing this the router may be holdong arp in it's cache for the external nic in which case clearing the arp table should do it if you do not have access to the router a reboot will do the same thing.