> -----邮件原件----- > 发件人: rrg-boun...@irtf.org [mailto:rrg-boun...@irtf.org] 代表 Christopher > Morrow > 发送时间: 2010年2月3日 11:00 > 收件人: Tony Li > 抄送: RRG; Robin Whittle > 主题: Re: [rrg] SEAL critique, PMTUD, RFC4821 = vapourware > > On Thu, Jan 28, 2010 at 2:25 AM, Tony Li <tony...@tony.li> wrote: > > Robin Whittle wrote: > > > >> I argue against Fred Templin's position that > >> ordinary RFC1191 DF=1 Path MTU Discovery (and > >> therefore its RFC1981 IPv6 equivalent) is "busted". > >> > >> Where is the evidence that networks filtering out > >> PTB (Packet Too Big) messages is a significant > >> problem? > > > > > > This happens. Consult some operator folks, privately and quietly. Many > > enterprises blocked all inbound ICMP when DDoS attacks started happening. > > yes, not just for 'dos attack' problems but because often people don't > understand what ICMP is there for :( the dreaded 'people can ping > you!!' apparently == 'deny icmp any any'
Yes, based on the above practice, some router vendors even give up the support for PMTUD in their router OSes. Xiaohu > PMTUD is horrendously supported :( > > -chris > (operatorish guy) > _______________________________________________ > rrg mailing list > rrg@irtf.org > http://www.irtf.org/mailman/listinfo/rrg _______________________________________________ rrg mailing list rrg@irtf.org http://www.irtf.org/mailman/listinfo/rrg
