nanog mailing list archives
RE: Common operational misconceptions
From: George Bonser <gbonser () seven com>
Date: Fri, 17 Feb 2012 16:10:37 +0000
It depends on how you define "work well". As the RFC says: indication of some significantly disruptive event in the network, such as a router failure or a routing change to a path with a smaller MTU. it can not react against PMTU changes very well. It is seemingly working well means there is not much PMTU changes, which means we had better assumes some PMTU (1280B, for example) and use it without PMTUD. Masataka Ohta
It depends on the OS and the method being used. If you set the option to "2" on Linux, it will do MTU probing constantly and react to MTU changes. Also, the MTU for a given path only "lives" for 5 minutes anyway (by default) and is "rediscovered" with Linux. (value in /proc/sys/net/ipv4/route/mtu_expires) but other operating systems may behave in other ways. I agree that if one tries hard enough, they can ensure a broken path and there are always people who seem to devote a lot of energy to that end. There's nothing that can be done about them but there is much the OS can try to do to defeat them at their task.
Current thread:
- Re: Common operational misconceptions, (continued)
- Re: Common operational misconceptions Masataka Ohta (Feb 16)
- Re: Common operational misconceptions Valdis . Kletnieks (Feb 16)
- Re: Common operational misconceptions Masataka Ohta (Feb 16)
- Re: Common operational misconceptions Valdis . Kletnieks (Feb 16)
- Re: Common operational misconceptions Masataka Ohta (Feb 16)
- Re: Common operational misconceptions Owen DeLong (Feb 16)
- Re: Common operational misconceptions Masataka Ohta (Feb 16)
- Re: Common operational misconceptions Owen DeLong (Feb 16)
- RE: Common operational misconceptions George Bonser (Feb 16)
- Re: Common operational misconceptions Masataka Ohta (Feb 16)
- RE: Common operational misconceptions George Bonser (Feb 17)
- Re: Common operational misconceptions Masataka Ohta (Feb 19)
- Re: Common operational misconceptions Valdis . Kletnieks (Feb 20)
- RE: Common operational misconceptions George Bonser (Feb 20)
- Re: Common operational misconceptions Masataka Ohta (Feb 20)
- RE: Common operational misconceptions George Bonser (Feb 20)
- Re: Common operational misconceptions Masataka Ohta (Feb 20)
- Re: Common operational misconceptions Steven Bellovin (Feb 20)
- Re: Common operational misconceptions Masataka Ohta (Feb 20)
- Re: Common operational misconceptions Steven Bellovin (Feb 20)
- Re: Common operational misconceptions Masataka Ohta (Feb 20)