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Re: PMTU-D: remember, your load balancer is broken
- From: Valdis.Kletnieks
- Date: Wed Jun 14 00:08:27 2000
On Tue, 13 Jun 2000 23:50:55 EDT, "Steven M. Bellovin" said:
> There are two places where it's very important. First, some server
> farms are on FDDI rings, so they have a higher MTU. Second -- and this
Yes, but I think I covered that in (a) - if you know there's a
bigger MTU, nail it down. I dread to think of a load-balancer
in the middle of a FDDI ring in a server farm ;)
> one is growing in importance -- tunnels, for IPsec, PPTP, etc. --
> generally have smaller MTUs. This very reply will travel over a tunnel
> with an MTU of, I believe, 1480.
Good point. It's been a long day, I wasn't QUITE thinking
straight. Another respondent commented that Windows98 apparently
nails an MTU of 576 on a dialup - Apparently I've not run into
any Windows98 people setting their clocks off the server I got
the numbers from. Also, he said that ADSL uses just under 1500.
I don't have a Win98 or ADSL handy to check. ;)
In any case, it's good fodder for an operational debate. ;)
Valdis Kletnieks
Operating Systems Analyst
Virginia Tech
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