RE: Could not ping 127.0.0.1 [7:17317]
... MANAGER#conf t Enter configuration commands, one per line. End with CNTL/Z. MANAGER(config)#int loop 100 MANAGER(config-if)#ip addr 127.0.0.1 255.0.0.0 Not a valid host address - 127.0.0.1 = my router still doesn't like this MANAGER(config-if)# were you using a particular router model or particular IOS version when you tried this? Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ednilson Rosa Sent: Sunday, August 26, 2001 8:04 AM To: [EMAIL PROTECTED] Subject: Re: Could not ping 127.0.0.1 [7:17317] On Cisco routers you must explicitly assign a loopback interface. If you want it to be 127.0.0.1 you must do like this: conf t int loopback1 ip address 127.0.0.1 255.255.0.0 Then you will be able to ping yourself at this address. The automatic well known loopback is valid only for nic cards and other devices where you wouldn't be able to setup a loopback by other means. Regards, Ednilson Rosa - Original Message - From: Lists Wizard To: Sent: Sunday, August 26, 2001 11:19 AM Subject: Could not ping 127.0.0.1 [7:17317] Hi Group Have any one tried to ping the well known loopback address 127.0.0.1? I tried but I could not. I could ping the other ip interfaces on the router though. Any explanation is welcomed. Thanks Lw Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=17479t=17317 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Could not ping 127.0.0.1 [7:17317]
In a message dated 8/27/01 9:10:48 PM Central Daylight Time, [EMAIL PROTECTED] writes: Subj: RE: Could not ping 127.0.0.1 [7:17317] Date: 8/27/01 9:10:48 PM Central Daylight Time From: [EMAIL PROTECTED] (Chuck Larrieu) Sender:[EMAIL PROTECTED] Reply-to: [EMAIL PROTECTED] (Chuck Larrieu) To:[EMAIL PROTECTED] Chuck, I agreehow in the hell do you assign a loop int with the NIC loopback 127.0.0.1?!?!? :) Rob H. NP, DP, blah,blah,blah.. ... MANAGER#conf t Enter configuration commands, one per line. End with CNTL/Z. MANAGER(config)#int loop 100 MANAGER(config-if)#ip addr 127.0.0.1 255.0.0.0 Not a valid host address - 127.0.0.1 = my router still doesn't like this MANAGER(config-if)# were you using a particular router model or particular IOS version when you tried this? Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ednilson Rosa Sent: Sunday, August 26, 2001 8:04 AM To: [EMAIL PROTECTED] Subject: Re: Could not ping 127.0.0.1 [7:17317] On Cisco routers you must explicitly assign a loopback interface. If you want it to be 127.0.0.1 you must do like this: conf t int loopback1 ip address 127.0.0.1 255.255.0.0 Then you will be able to ping yourself at this address. The automatic well known loopback is valid only for nic cards and other devices where you wouldn't be able to setup a loopback by other means. Regards, Ednilson Rosa - Original Message - From: Lists Wizard To: Sent: Sunday, August 26, 2001 11:19 AM Subject: Could not ping 127.0.0.1 [7:17317] Hi Group Have any one tried to ping the well known loopback address 127.0.0.1? I tried but I could not. I could ping the other ip interfaces on the router though. Any explanation is welcomed. Thanks Lw Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=17481t=17317 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Could not ping 127.0.0.1 [7:17317]
On Cisco routers you must explicitly assign a loopback interface. If you want it to be 127.0.0.1 you must do like this: conf t int loopback1 ip address 127.0.0.1 255.255.0.0 Then you will be able to ping yourself at this address. The automatic well known loopback is valid only for nic cards and other devices where you wouldn't be able to setup a loopback by other means. Regards, Ednilson Rosa - Original Message - From: Lists Wizard To: Sent: Sunday, August 26, 2001 11:19 AM Subject: Could not ping 127.0.0.1 [7:17317] Hi Group Have any one tried to ping the well known loopback address 127.0.0.1? I tried but I could not. I could ping the other ip interfaces on the router though. Any explanation is welcomed. Thanks Lw Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=17318t=17317 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Could not ping 127.0.0.1 [7:17317]
you cannot configure a Cisco interface with the reserved address 127.x.x.x MANAGER#conf t Enter configuration commands, one per line. End with CNTL/Z. MANAGER(config)#int loop 0 MANAGER(config-if)#ip addr 127.0.0.1 255.0.0.0 Not a valid host address - 127.0.0.1 MANAGER(config-if)# you can ping the 127.x.x.x from a PC host easily. I don't know the reason, and do not have time to research at the moment. I suspect that this is deliberate on Cisco's part. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Ednilson Rosa Sent: Sunday, August 26, 2001 8:04 AM To: [EMAIL PROTECTED] Subject: Re: Could not ping 127.0.0.1 [7:17317] On Cisco routers you must explicitly assign a loopback interface. If you want it to be 127.0.0.1 you must do like this: conf t int loopback1 ip address 127.0.0.1 255.255.0.0 Then you will be able to ping yourself at this address. The automatic well known loopback is valid only for nic cards and other devices where you wouldn't be able to setup a loopback by other means. Regards, Ednilson Rosa - Original Message - From: Lists Wizard To: Sent: Sunday, August 26, 2001 11:19 AM Subject: Could not ping 127.0.0.1 [7:17317] Hi Group Have any one tried to ping the well known loopback address 127.0.0.1? I tried but I could not. I could ping the other ip interfaces on the router though. Any explanation is welcomed. Thanks Lw Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=17322t=17317 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Could not ping 127.0.0.1 [7:17317]
Almost sure that one cannot assign an address on the 127 network to a cisco router. This address is reserved for special reasons. One of the reasons that come to mind is to test the TCP/IP stack on a workstation or Server. If pinging the 127.0.0.1 address is successful, you can be almost sure that the TCP/IP stack loaded properly. Now you could proceed to ping default gateway etc etc. Cisco routers provide this functionality by using a loopback command on interfaces. If packets sent by an interface come back to the router, then TCP/IP is probably OK. Allowing the 127 net on routers would probably cause havoc especially on broadcast networks. Winston(#7991) -Original Message- From: Ednilson Rosa [mailto:[EMAIL PROTECTED]] Sent: Sunday, August 26, 2001 5:04 PM To: [EMAIL PROTECTED] Subject: Re: Could not ping 127.0.0.1 [7:17317] On Cisco routers you must explicitly assign a loopback interface. If you want it to be 127.0.0.1 you must do like this: conf t int loopback1 ip address 127.0.0.1 255.255.0.0 Then you will be able to ping yourself at this address. The automatic well known loopback is valid only for nic cards and other devices where you wouldn't be able to setup a loopback by other means. Regards, Ednilson Rosa - Original Message - From: Lists Wizard To: Sent: Sunday, August 26, 2001 11:19 AM Subject: Could not ping 127.0.0.1 [7:17317] Hi Group Have any one tried to ping the well known loopback address 127.0.0.1? I tried but I could not. I could ping the other ip interfaces on the router though. Any explanation is welcomed. Thanks Lw Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=17336t=17317 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
