> wget <ip address of the site in question> > > you can see the size being set in tcpdump. > > if it still stalls after setting to 1400, try something smaller 900 - > just to make sure we are on the right track. > > Alex > > I've done 4 tests a) tcpdump in non promiscous mode and try to contact via wget www.microsoft.com with a mtu set to 1400 : segment size is regulated to 1360 so under the value b) tcpdump in promiscous mode try to contact via wget www.microsoft.com from win station same max mtu size : segment size is regulated to 1360 so under the value c) same as (a) but with a mtu of 1000 : packet size is maximized to 960... d same as (b) but with mtu of 1000 : packet size is maximized to 960...
a) # tcpdump -pni ppp0 host www.microsoft.com tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 22:16:31.535269 IP 86.69.85.63.49104 > 207.46.19.190.80: S 1429337682:1429337682(0) win 5440 <mss 1360,sackOK,timestamp 24647950 0,nop,wscale 1> 22:16:34.535269 IP 86.69.85.63.49104 > 207.46.19.190.80: S 1429337682:1429337682(0) win 5440 <mss 1360,sackOK,timestamp 24648700 0,nop,wscale 1> b) tcpdump -ni ppp0 host www.microsoft.com tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 22:21:24.527269 IP 86.69.85.63.3183 > 207.46.192.254.80: S 824552434:824552434(0) win 65535 <mss 1360,nop,nop,sackOK> c) tcpdump -pni ppp0 host www.microsoft.com tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 22:58:39.003269 IP 86.77.213.79.55709 > 207.46.19.190.80: S 2417518931:2417518931(0) win 3840 <mss 960,sackOK,timestamp 25279817 0,nop,wscale 1> d) tcpdump -ni ppp0 host www.microsoft.com tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked), capture size 96 bytes 23:01:13.539269 IP 86.77.213.79.3433 > 65.55.21.250.80: S 1538952923:1538952923(0) win 65535 <mss 960,nop,nop,sackOK> Ok so maybe its not mtu related ?! no ? what do you think about that Alex ? -- Guillaume -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
