Hello, If there are Path MTU discovery blackhole router(s) between web server and your client, such packets can be seen; server does not send large packets but does small ones and client replies ack with SACK.
On Thu, 10 Oct 2013 14:10:13 +0200 Reinoud Zandijk <[email protected]> wrote: > Hi folks, > > i'm experiencing some odd problems with my IPv6 provider. Sometimes all works > fine but at other times just opening a connection or getting a webpage just > fails without a clear reason to me or a ftp transfer just halts in the middle > and never revives. > > I've created a tcpdump of Firefox on NetBSD/i386 of loading a webpage from > some IPv6 enabled website. I've seen similar behaviour on NetBSD/amd64 and > even on Windows7, so i dont think its NetBSD related. For privacy reasons i've > replaced some of the actual addresses since this is going for public. > > Could you please take a look at the trace and/or give me some pointers as how > to debug this? Is this a problem at my ISP provided modem? Or is it upstream > my ISP ? > > The tcpdump is at: http://pastebin.com/3MPg6qnE > > With regards, > Reinoud Zandijk > -- t-hash
