nanog mailing list archives
Re: Should routers send redirects by default?
From: Mark Smith <nanog () 85d5b20a518b8f6864949bd940457dc124746ddc nosense org>
Date: Thu, 26 Aug 2010 07:35:53 +0930
On Wed, 25 Aug 2010 01:18:15 -0400 Christopher Morrow <christopher.morrow () gmail com> wrote:
On Tue, Aug 24, 2010 at 4:32 PM, William Herrin <bill () herrin us> wrote:On Fri, Aug 20, 2010 at 1:20 PM, Christopher Morrow <christopher.morrow () gmail com> wrote:Polling a little bit here, there's an active discussion going on 6man@ietf about whether or not v6 routers should: o be required to implement ip redirect functions (icmpv6 redirect) o be sending these by defaultHi Chris, If you don't mind, I'd like to ask a similar question whose answers might be instructive for the question you asked:sure :) (other folks should also chime in, or I thought that was the spirit of your question...)Forgetting all of the theoretical constructs for a moment, has anyone here personally encountered an operational scenario in which ICMP redirects solved a problem for you that you would otherwise have found difficult or intransigent? Without naming names, would you describe the scenario's details, explain the problem that would have existed absent redirects and explain how redirects solved it for you?I've never had redirects solve a problem for me.
So how do you know? If redirects are enabled by default, then they may have fixed a problem for you that you didn't know existed and never realised existed. When your packets get there successfully you don't go and investigate why. You only troubleshoot failure, not success. I think the only way to know an absolute answer would be to have witnessed this sequence of events - have an environment where redirects are switched off - suffer from a problem that redirects are designed to solve - switch redirects on and have the problem not disappear Of course, the problem not disappearing when redirects are enabled might also mean a misdiagnosis of what the problem really is. Regards, Mark.
Current thread:
- Re: Should routers send redirects by default?, (continued)
- Re: Should routers send redirects by default? Eric J. Katanich (Aug 20)
- Re: Should routers send redirects by default? Eric J. Katanich (Aug 20)
- Re: Should routers send redirects by default? David W. Hankins (Aug 24)
- Re: Should routers send redirects by default? David W. Hankins (Aug 24)
- Re: Should routers send redirects by default? Eric J. Katanich (Aug 20)
- Re: Should routers send redirects by default? William Herrin (Aug 24)
- Re: Should routers send redirects by default? Christopher Morrow (Aug 24)
- Re: Should routers send redirects by default? Stephen Stuart (Aug 24)
- Re: Should routers send redirects by default? Mikael Abrahamsson (Aug 24)
- Re: Should routers send redirects by default? Randy Bush (Aug 25)
- Re: Should routers send redirects by default? Christopher Morrow (Aug 24)
- Re: Should routers send redirects by default? Mark Smith (Aug 25)
- Re: Should routers send redirects by default? Warren Kumari (Aug 25)