Why can't I ping my own interface address? [7:25040]
Hi Folks, I am not being able to ping a local interface on a router. The encapsulation is default and is connected back to back on a serial interface to the next router. The output of show interface shows that the interface is up. I would appreciate if someone could shed some light into this problem. Thanking in advance. Zahid Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25040t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Why can't I ping my own interface address? [7:25040]
This happen often when there is duplicate address. Make sure you do not have a duplicate address. Some times even when you remove the duplicate address, you still need to restart the interface. -- watch your phone call records on the web at: http://www.freedomstar.com/sh1885969 Zahid Hassan wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi Folks, I am not being able to ping a local interface on a router. The encapsulation is default and is connected back to back on a serial interface to the next router. The output of show interface shows that the interface is up. I would appreciate if someone could shed some light into this problem. Thanking in advance. Zahid Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25042t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Why can't I ping my own interface address? [7:25040]
This happen often when there is duplicate address. Make sure you do not have a duplicate address. Some times even when you remove the duplicate address, you still need to restart the interface. Also, oftentimes, it means that there's no return route for the ICMP reply from the target PINGed address. I am not being able to ping a local interface on a router. The encapsulation is default and is connected back to back on a serial interface to the next router. The output of show interface shows that the interface is up. I would appreciate if someone could shed some light into this problem. Thanking in advance. Zahid _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25058t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Why can't I ping my own interface address? [7:25040]
If you have an IP address on the serial interface, you won't be able to ping it locally. If you configure your link as a subinterface (using S0.1 instead of S0), then you can ping it. Don't know why, but we ran into that and were pulling our hair out until I read somewhere on Cisco's site that this was the case. Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25065t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Why can't I ping my own interface address? [7:25040]
You might need to put some kind of clocking on the dce side of the serial connection. Jay -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of EA Louie Sent: Friday, November 02, 2001 8:46 AM To: [EMAIL PROTECTED] Subject: Re: Why can't I ping my own interface address? [7:25040] This happen often when there is duplicate address. Make sure you do not have a duplicate address. Some times even when you remove the duplicate address, you still need to restart the interface. Also, oftentimes, it means that there's no return route for the ICMP reply from the target PINGed address. I am not being able to ping a local interface on a router. The encapsulation is default and is connected back to back on a serial interface to the next router. The output of show interface shows that the interface is up. I would appreciate if someone could shed some light into this problem. Thanking in advance. Zahid _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25071t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Why can't I ping my own interface address? [7:25040]
I am not being able to ping a local interface on a router. The encapsulation is default and is connected back to back on a serial interface to the next router. The output of show interface shows that the interface is up. In order to ping a serial interface the actual ICMP packet exits the router, bounces (for lack of a better word) of the directly connected remote router, and returns to the original router. If your directly connected router is not reachabe, you will not be able to ping your local interface. You will notice that it will actually take longer to ping your local router then a directly connected router because of this behavior. Try this, ping the remote router. If it does not work, then fix that problem first. Make sure you have clock-rate turned on the DCE serial interface if this is a lab environmnet. Once you can ping the remote router, then try to ping the local interface. I bet it works. As an experment try the following. On the remote router setup an access list that prevents ICMP (but allows all other IP) and apply to the inbound serial interface. This will prevent the local router from pinging it's own local serial interface. Cool, huh! Best of luck, Paul Borghese Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25075t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Why can't I ping my own interface address? [7:25040]
Michael Williams wrote: If you have an IP address on the serial interface, you won't be able to ping it locally. If you configure your link as a subinterface (using S0.1 instead of S0), then you can ping it. Don't know why, but we ran into that and were pulling our hair out until I read somewhere on Cisco's site that this was the case. No, that is not true, you can ping it locally but the packet must first bounce off the remote router. So the remote router must be reachable and allowing ICMP traffic. If you are using Frame-Relay then we have a new issue. You must create a PVC to allow the ping to return. Here is an experiment I just performed. 1.1.1.1 is the remote IP address and 1.1.1.2 is the local IP address. --- local#ping 1.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 32/35/36 ms local#ping 1.1.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max = 68/71/80 ms Now I applied the following access to the inbound side of the remote router (1.1.1.1) access-list 100 deny icmp any any access-list 100 permit ip any any Here are the results: local#ping 1.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: U.U.U Success rate is 0 percent (0/5) local#ping 1.1.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 1.1.1.2, timeout is 2 seconds: U.U.U Success rate is 0 percent (0/5) --- Notice I can now no longer ping the local interface! Cool, huh! Take care, Paul Borghese Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=25077t=25040 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
