nanog mailing list archives
RE: looping traceroutes
From: "Hire, Ejay" <Ejay.Hire () Broadslate net>
Date: Wed, 19 Sep 2001 11:51:35 -0400
This behavior would occur if the traffic was routed to a loopback interface. -----Original Message----- From: Leo Bicknell [mailto:bicknell () ufp org] Sent: Wednesday, September 19, 2001 8:09 AM To: nanog () merit edu Subject: Re: looping traceroutes On Wed, Sep 19, 2001 at 12:40:51AM -0700, Ratul Mahajan wrote:
Do you think that it can be a real persistent routing loop (data packets would actually shuttle between the two interfaces) as against some wierdness because of traceroute?
I'd tell you a story, but it would make all of nanog cringe. Put simply, I know of at least one medium size regional network who when they couldn't make "bgp work" decided to implement a series of scripts that logged into all routers and installed statics to make things work. Let me just tell you, after a few short weeks of adding and removing (and missing) such routes there were loops all over the place, many of which are probably still there. :-( There are a number of ways long lived loops can occur. I believe others have pointed out some other methods. -- Leo Bicknell - bicknell () ufp org Systems Engineer - Internetworking Engineer - CCIE 3440 Read TMBG List - tmbg-list-request () tmbg org, www.tmbg.org
Current thread:
- looping traceroutes Ratul Mahajan (Sep 18)
- Re: looping traceroutes Stephen J. Wilcox (Sep 19)
- <Possible follow-ups>
- Re: looping traceroutes Patrick W. Gilmore (Sep 18)
- Re: looping traceroutes Ratul Mahajan (Sep 19)
- Re: looping traceroutes Stephen Stuart (Sep 19)
- Re: looping traceroutes Leo Bicknell (Sep 19)
- Re: looping traceroutes Nick Feamster (Sep 19)
- Re: looping traceroutes Ratul Mahajan (Sep 19)
- Re: looping traceroutes Marshall Eubanks (Sep 19)
- RE: looping traceroutes Jeb R. Linton (Sep 19)
- RE: looping traceroutes Hire, Ejay (Sep 19)