3 Feb
2015
3 Feb
'15
12:25 a.m.
On 04/02/2015 05:18, Matthew Luckie wrote:
Two reasons for a content provider to force a small TCP MSS:
(1) Working around broken networks that filter ICMPv6 Packet Too Big messages
How many networks on the path back to a content provider filter PTB messages, apart from the content provider itself? I'd have thought a transit network filtering a PTB would be extremely rare.
But throttling ICMP(v6) to avoid primitive DOS attacks might not be so rare, and that would lead to random loss of PTBs. Anyway, it's pretty easy to determine that PTBs are getting dropped, but pretty hard to find out exactly where it happens. Brian