l.yimg.com (Yahoo!) over IPv6
Matthew Luckie
mjl at luckie.org.nz
Tue Aug 20 18:23:18 CEST 2013
I tried from work (2001:48d0:101:501:d267:e5ff:fe14:a701):
$ 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 216.115.97.236
ds-fo-anyycs-l.ay1.b.yahoodns.net has IPv6 address 2001:4998:f011:1fb::c:1101
And there were no MTU issues. However, for a bunch of the addresses you
supplied from your VP:
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
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
They failed, presumably because they filter the PTB messages.
To reproduce:
scamper -O warts -o delme.warts -F ipfw -I "tbit -u 'http://l.yimg.com/pv/static/misc/index.html' 2406:2000:ac:5::c:1101"
sc_wartsdump delme.warts
The test works on FreeBSD and MacOS up until the MacOS they removed IPFW
from.
tbit from 2001:48d0:101:501:d267:e5ff:fe14:a701 to 2001:4998:8:1::2000
list id: 0, name: default
cycle id: 0
user-id: 0
start: Tue Aug 20 09:14:53 2013 290885
sport: 58765, dport: 80
client-mss: 1440, server-mss: 1440
type: pmtud, result: pmtud-fail
mtu: 1280, ptb-retx: 4
app: http, url: http://l.yimg.com/pv/static/misc/index.html
[ 0.048] TX SYN 64 0:0
[ 0.060] RX SYN/ACK 64 0:1
[ 0.098] TX 60 1:1
[ 0.148] TX 254 1:1(194)
[ 0.160] RX 60 1:195
[ 0.169] RX 1500 1:195(1440)
[ 0.169] RX 1500 1441:195(1440)
[ 0.169] RX 1500 2881:195(1440)
[ 0.169] RX 1500 4321:195(1440)
[ 0.169] RX 376 5761:195(316)
[ 0.198] TX PTB 1280 mtu = 1280
[ 0.248] TX 60 195:1
[ 3.169] RX 1500 1:195(1440)
[ 3.169] TX PTB 1280 mtu = 1280
[ 9.169] RX 1500 1:195(1440)
[ 9.169] TX PTB 1280 mtu = 1280
[ 10.169] RX FIN 60 6077:195
[ 10.169] TX 60 195:1
[ 21.169] RX 1500 1:195(1440)
[ 21.169] TX PTB 1280 mtu = 1280
[ 45.168] RX 1500 1:195(1440)
tbit from 2001:48d0:101:501:d267:e5ff:fe14:a701 to 2001:4998:8:1::2001
list id: 0, name: default
cycle id: 0
user-id: 0
start: Tue Aug 20 09:16:16 2013 561876
sport: 58778, dport: 80
client-mss: 1440, server-mss: 1440
type: pmtud, result: pmtud-fail
mtu: 1280, ptb-retx: 4
app: http, url: http://l.yimg.com/pv/static/misc/index.html
[ 0.049] TX SYN 64 0:0
[ 0.061] RX SYN/ACK 64 0:1
[ 0.099] TX 60 1:1
[ 0.148] TX 254 1:1(194)
[ 0.160] RX 60 1:195
[ 0.168] RX 1500 1:195(1440)
[ 0.168] RX 1500 1441:195(1440)
[ 0.168] RX 1500 2881:195(1440)
[ 0.168] RX 1500 4321:195(1440)
[ 0.168] RX 376 5761:195(316)
[ 0.199] TX PTB 1280 mtu = 1280
[ 0.248] TX 60 195:1
[ 3.168] RX 1500 1:195(1440)
[ 3.168] TX PTB 1280 mtu = 1280
[ 9.168] RX 1500 1:195(1440)
[ 9.168] TX PTB 1280 mtu = 1280
[ 10.168] RX FIN 60 6077:195
[ 10.168] TX 60 195:1
[ 21.168] RX 1500 1:195(1440)
[ 21.168] TX PTB 1280 mtu = 1280
[ 45.168] RX 1500 1:195(1440)
tbit from 2001:48d0:101:501:d267:e5ff:fe14:a701 to 2406:2000:ac:5::c:1101
list id: 0, name: default
cycle id: 0
user-id: 0
start: Tue Aug 20 09:17:32 2013 976874
sport: 58782, dport: 80
client-mss: 1440, server-mss: 1440
type: pmtud, result: pmtud-fail
mtu: 1280, ptb-retx: 4
app: http, url: http://l.yimg.com/pv/static/misc/index.html
[ 0.050] TX SYN 64 0:0
[ 0.343] RX SYN/ACK 64 0:1
[ 0.343] TX 60 1:1
[ 0.394] TX 254 1:1(194)
[ 0.688] RX 60 1:195
[ 0.728] RX 1500 1:195(1440)
[ 0.728] TX PTB 1280 mtu = 1280
[ 0.728] RX 1500 1441:195(1440)
[ 0.728] RX 1500 2881:195(1440)
[ 0.728] RX 1500 4321:195(1440)
[ 0.728] RX 376 5761:195(316)
[ 0.778] TX 60 195:1
[ 3.728] RX 1500 1:195(1440)
[ 3.728] TX PTB 1280 mtu = 1280
[ 9.728] RX 1500 1:195(1440)
[ 9.728] TX PTB 1280 mtu = 1280
[ 10.729] RX FIN 60 6077:195
[ 10.729] TX 60 195:1
[ 21.728] RX 1500 1:195(1440)
[ 21.728] TX PTB 1280 mtu = 1280
[ 45.728] RX 1500 1:195(1440)
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