I had an idea-tell me if I'm crazy(you would not be the first person-ha, ha). If I want to merge two networks for access to applications(servers) on each other that have overlapping ip's via a frame relay link as long as the servers hosing the applications I will be sharing don't have conflicting ip addresses do I need to use NAT? The thought here was that since the source of the packets being sent over the T1 would be the router and not the user the ip 's I would only conflict if the servers had duplicate addresses. Right? Wrong? And if I need NAT I could use a dynamic pool for the ethernet and a static for the serial(over the frame circuit) Right? Wrong? Let me know what you think and thanks.
If I understand Your question right - You can use NAT overload on Your frame-relay interface specifying it as an outside interface and having Your Ethernet configured as an inside and using access-list permiting IP addresses on Your ethernet as source addresses for NAT.
Using NAT, this would be the way to get arround overlaping IP addresses, assuming that You do not have addresses being translated (overlaping IP addresses) in Your main router routing table and I see nothing crazy in it.
Thanks for the input, what I was wondering is can I NOT use NAT if the if the users overlap but the servers don't? This would probably cause problems with routing updates(could I use passive interfaces and static routes?) Or would NAT be the way to go?
You are absolutely correct - You have to use NAT with overlaping subnets, ensuring that Your overlaping networks are not "hitting" the outside world - as en example would be the Internet and a private IP addresses.
As in regards to routing, there are many ways to prevent overlaping subnets going to outside - distribute-lists, static routes or appropriate routing protocol configuration (probably, on a router doing NAT you will need a single static default route) like ip route 0.0.0.0 0.0.0.0 int ser0 or similar.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.