On 2013-08-19 23:10 , Phil Pennock wrote: > On 2013-08-19 at 15:10 -0500, Frank Bulk wrote: >> It works for me, too. >> >> Can you replicate this issue on other machines and vantage points? > > I did, last week when I first saw it, to initially confirm it wasn't my > home connection; at which point, I shrugged and left the issue. > > At home, SixXS tunnel in USA, correctly configured.
While your end might be correctly configured, the path between you and them might not be. Especially in the case of tunnels where a non-1500 byte MTU is likely to exist and silly admins still exist who think that ICMP is evil and thus are stupid and drop it, especially that all important ICMPv6-Packet-Too-Big packet. > Replicated behaviour on my colo box in NL, which has native v6 in > continuous operation for about seven years now. AS8283. > > When I check now, the site has been fixed. No idea if my questioning > the status influenced that or not ... Please note that the 'l' in l.yimg.com stands for load balancer, a geographic one in this case. See below, three different ASNs, three different results; and that is just on the DNS/IP level, what actually happens at these sites is likely another level of load-balancers with a bunch of machines behind it. Stuff can be broken at any of those levels. As such, a traceroute/tracepath is very useful when making any statements like this, next to that all important wireshark dump which will likely tell you where/why your TCP session hangs. Greets, Jeroen -- $ host l.yimg.com l.yimg.com is an alias for fd-geoycs-l.gy1.b.yahoodns.net. fd-geoycs-l.gy1.b.yahoodns.net is an alias for ds-fo-anyycs-l.ay1.b.yahoodns.net. ds-fo-anyycs-l.ay1.b.yahoodns.net has address 206.190.60.138 ds-fo-anyycs-l.ay1.b.yahoodns.net has address 206.190.60.139 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:f011:1fb::c:1101 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:f007:1fb::c:1103 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:8:1::2000 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:f007:1fb::c:1101 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:8:1::2001 $ host l.yimg.com l.yimg.com is an alias for fd-geoycs-l.gy1.b.yahoodns.net. fd-geoycs-l.gy1.b.yahoodns.net is an alias for ds-fo-anyycs-l.ay1.b.yahoodns.net. ds-fo-anyycs-l.ay1.b.yahoodns.net has address 66.196.65.174 ds-fo-anyycs-l.ay1.b.yahoodns.net has address 66.196.65.111 ds-fo-anyycs-l.ay1.b.yahoodns.net has address 66.196.65.112 ds-fo-anyycs-l.ay1.b.yahoodns.net has address 66.196.65.188 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2a00:1288:f00e:1fc::c:1101 ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2a00:1288:f00e:1fc::c:1103 $ host l.yimg.com l.yimg.com is an alias for fd-geoycs-l.gy1.b.yahoodns.net. fd-geoycs-l.gy1.b.yahoodns.net is an alias for ds-geoycs-l.gy1.b.yahoodns.net. ds-geoycs-l.gy1.b.yahoodns.net is an alias for ds-fo-vnycs-l.gy1.b.yahoodns.net. ds-fo-vnycs-l.gy1.b.yahoodns.net is an alias for ds-pxe-vnycs-p.gy1.b.yahoodns.net. ds-pxe-vnycs-p.gy1.b.yahoodns.net has address 210.211.100.99 ds-pxe-vnycs-p.gy1.b.yahoodns.net has address 106.10.199.78 ds-pxe-vnycs-p.gy1.b.yahoodns.net has address 210.211.100.100 ds-pxe-vnycs-p.gy1.b.yahoodns.net has address 210.211.107.99 ds-pxe-vnycs-p.gy1.b.yahoodns.net has IPv6 address 2406:2000:f008:1fd::c:1101 ds-pxe-vnycs-p.gy1.b.yahoodns.net has IPv6 address 2406:2000:ac:5::c:1101 ds-pxe-vnycs-p.gy1.b.yahoodns.net has IPv6 address 2406:2000:f008:1fd::c:1103 ds-pxe-vnycs-p.gy1.b.yahoodns.net has IPv6 address 2406:2000:fc:402::c:2203
