You can't have duplicate IP addresses anywhere. They have to be unique. The only exceptions would be if you were doing some sort of NAT or tunneling or something and the duplicates were hidden from each other.
You don't get an error when you try to configure it because it's a lot harder for IOS to detect this on a serial interface than on an Ethernet interface. On Ethernet, a Cisco router ARPs for the address you give it. If it receives a reply, then it gives you an error and won't let you use the address. There's no ARP in serial land. You think you're pinging successfully, but how do you know who is really replying? Even if you could assign duplicate IP addresses, you shouldn't. You would wreak havoc with all sorts of things. There's no reason to do it either. If you're concerned with running out of addresses, just use private address. The 10.0.0.0 network has 16 million possibilities. Someone had to get blunt here! :-) _______________________________ Priscilla Oppenheimer www.troubleshootingnetworks.com www.priscilla.com Ladrach, Daniel E. wrote: > > If you ping you are probably pinging the Local IP.Try debug ip > icmp to > verify what you are pinging. > > Daniel Ladrach > CCNP, CCNA > WorldCom > > > > -----Original Message----- > From: Monu Sekhon [mailto:[EMAIL PROTECTED]] > Sent: Monday, February 10, 2003 12:03 PM > To: [EMAIL PROTECTED] > Subject: RE: Simple Ip issue (need help) [7:62728] > > > Hi All, > Thanx again for all for contribution > confusion still there , > I am pinging remote side and I am able too. > any comments from all(still confused with answers) > > Walker, James - Is wrote: > > > > Only problem is which side are you pinging???????? > > > > > > > > > > -----Original Message----- > > From: John Murphy [mailto:[EMAIL PROTECTED]] > > Sent: Monday, February 10, 2003 11:15 AM > > To: [EMAIL PROTECTED] > > Subject: Re: Simple Ip issue (need help) [7:62728] > > > > > > If you're asking what I think you're asking, then I think your > > answer is > > yes, but you won't be able to pass any traffic across the > > circuit. Unless > > you've confused me (it doesn't seem I would be the only one), > > then the > > answer might not be the same. > > > > > > ----- Original Message ----- > > From: "Monu Sekhon" > > To: > > Sent: Monday, February 10, 2003 12:13 AM > > Subject: Simple Ip issue (need help) [7:62728] > > > > > > > Hi All, > > > I have very simple question, Can we use duplicate ips on > > serial interfaces > > > among them seleves although we cannot use duplicate ip on > > serial with > > > Ethernet(lan interface) or loopback interface. > > > > > > > > > My topology is like this > > > > > > Client router server router(connected back to back) > > > 2 interfaces 2 inetrfaces > > > > > > > > > these routers connected back to back > > > > > > > > > configuration > > > int serial 0/0 > > > encap hdlc > > > ip address 1.1.1.1 255.255.255.0 > > > > > > int serial 0/1 > > > ip address 1.1.1.1 255.255.255.0 > > > encap hdlc > > > > > > > > > > > > now if all the two interfaces of serial even if given > > duplicate ip among > > > themselves works fine. no error from cli .interfaces are up > > > and i am able to ping remote side. > > > > > > > > > > > > The ques is that > > > > > > 1) Lan interface also was in different subnet but serial > > interface > > > doesnot accept that ips as duplicate or of loopback > > > > > > 2)What Implication such have on my design ,any limitation it > > has > > > > > > Does this type of design can be used, > > > > > > This is small thing is confusing me about ip. > > > > > > Thanx in advance > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=62767&t=62728 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
