nanog mailing list archives
Re: PMTU-D: remember, your load balancer is broken
From: Bennett Todd <bet () rahul net>
Date: Wed, 14 Jun 2000 11:43:36 -0400
2000-06-14-00:36:08 Marc Slemko:
b) If you're a webserver or something else providing service Out There to random users, just nail the MTU at 1500, which will work for any Ethernet/PPP/SLIP out there. And if you're load balancing to geographically disparate servers, then your users are probably Out There, with an MTU almost guaranteed to be 1500.Except that, technically, you are not permitted to just blindly send segments of such size. Well, you can but systems in the middle don't have to handle them. No?
No? I thought traffic only failed to flow when PMTU discovery was attempted (dont-fragment bit set on first packet) but the needed ICMP to make it work was being blocked. If you don't even try to do PMTU, then people who have paths where middle links have MTUs smaller than the smallest of the two end-points' MTUs will just have to fragment. And as long as they're rare, that shouldn't be much problem, no? -Bennett
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- PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 14)
- RE: PMTU-D: remember, your load balancer is broken Roeland Meyer (E-mail) (Jun 14)
- RE: PMTU-D: remember, your load balancer is broken John Fraizer (Jun 14)
- Re: PMTU-D: remember, your load balancer is broken Paul Vixie (Jun 17)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 17)
- Re: PMTU-D: remember, your load balancer is broken Bora Akyol (Jun 18)
- Re: PMTU-D: remember, your load balancer is broken Paul Vixie (Jun 19)
- Re: PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Bennett Todd (Jun 14)
- <Possible follow-ups>
- Re: PMTU-D: remember, your load balancer is broken Steven M. Bellovin (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)
- Re: PMTU-D: remember, your load balancer is broken Brett Frankenberger (Jun 14)
- Re: PMTU-D: remember, your load balancer is broken Greg A. Woods (Jun 15)
- Re: PMTU-D: remember, your load balancer is broken Greg A. Woods (Jun 15)
- Re: PMTU-D: remember, your load balancer is broken Marc Slemko (Jun 15)
- Re: PMTU-D: remember, your load balancer is broken Greg A. Woods (Jun 15)
- Re: PMTU-D: remember, your load balancer is broken Valdis . Kletnieks (Jun 13)