I want to share a problem I encounter. What is a possible causes if I can trace an IP (server) from a branch to HQ, but I can't ping it and use it. This occur only for 1 branch during an ISDN call, other branch are OK even when it using ISDN. Can somebody help. Thanks.
Good Day! This maybe because PING or TELNET is not allowed on the server. The server might have an active firewall the does not allow these services. Another is the router might have access lists configured that also does not allow them. Try to ping the router closest to the server, if this is successful then the first reason could be the case.
Thanks for your prompt reply. If I not mistaken, the server allow PING because, other branches router can ping it even when using ISDN. For the trouble branch, when it are on Lease Line (thru MPLS), the server are pingable.
Yeah, its a lil complicated. I've done a few troubleshooting step including enable show ip icmp command. What I can seee is, the trouble router did't get the ICMP replies from the server, its only state that it can reach to HQ LAN Ip..
I do not believe that we have enough information yet to find the answer to your problem. I agree with Albert that it seems likely that there is some configuration issue (most likely an access list issue or perhaps some ISDN issue) which is causing this. Perhaps you can post the configuration of the router and then we might be better able to help find an answer to your problem.
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