Re: Linux-PC blocked/filtered in the network.
Petter Reinholdtsen skrev:
[Ole-Anders Andreassen]
One of the "really nice features" is that I can use WinXP from
virtualbox on my linux laptop, and with the virtual WinXP I do not
have problems accessing the Internet. Jan Roar has testet this from
another school, and the same happens there...
This seem to indicate that the problem is with the interaction between
the TCP stack on Linux and the firewall in question.
I tried to google for anything related, assuming the firewall is
firewall-1, but found nothing that seemed relevant.
Given that this problem do not seem to affect all Firewall-1 owners, I
suspect the problem must be in the configuration at your site.
I remember a similar problem affecting a school once, where the
transparent HTTP proxy were unable to handle unix line endings in HTTP
headers, and simply refused to let such normal Linux requests true.
Could it be similar?
This bug has been fixed in FW1 I think.
Does the problem only affect port 80, or is it any port? Do you see
the same problem with 'tcptraceroute www.skolelinux.org ssh', for
example?
HTTP and FTP is blocked. HTTPS works, SSH works...
tjener:~# tcptraceroute www.skolelinux.org ssh
Selected device eth0, address 10.0.2.2, port 59463 for outgoing packets
Tracing the path to www.skolelinux.org (158.36.191.137) on TCP port 22 (ssh), 30 hops max
1 10.0.2.1 0.557 ms 0.462 ms 0.450 ms
2 10.63.152.1 1.181 ms 0.922 ms 0.896 ms
3 10.202.63.1 5.764 ms 5.917 ms 5.803 ms
4 10.200.193.17 3.673 ms 3.776 ms 5.957 ms
5 85.221.22.129 4.070 ms 15.449 ms 8.336 ms
6 85.221.22.1 5.936 ms 12.141 ms 10.848 ms
7 195.204.200.102 5.765 ms 9.846 ms 5.973 ms
8 195.204.200.101 5.570 ms 14.812 ms 8.235 ms
9 195.204.183.16 24.311 ms 22.571 ms 17.326 ms
10 c10G-xe-4-3-0.br1.xa19.no.catchbone.net (193.75.9.21) 17.528 ms 15.719 ms 20.171 ms
11 te6-1-0.cr2.xa19.no.catchbone.net (193.75.1.49) 16.395 ms 16.949 ms 19.035 ms
12 te5-1-0.cr2.osls.no.catchbone.net (193.75.1.201) 18.246 ms 16.020 ms 17.180 ms
13 te4-1-0.br1.osls.no.catchbone.net (193.75.3.170) 15.788 ms 18.790 ms 15.875 ms
14 stolav-gw1.uninett.no (193.156.120.1) 18.410 ms 16.815 ms 23.202 ms
15 oslo-gw.uninett.no (128.39.255.85) 21.926 ms 39.066 ms 38.094 ms
16 uio-gw8.uio.no (128.39.65.18) 37.773 ms 25.601 ms 20.775 ms
17 mrom-gw2.uio.no (129.240.25.18) 25.925 ms 16.728 ms 17.318 ms
18 maintainer.skolelinux.no (158.36.191.137) [open] 19.139 ms 22.817 ms 25.255 ms
tjener:~# tcptraceroute www.skolelinux.org
Selected device eth0, address 10.0.2.2, port 39021 for outgoing packets
Tracing the path to www.skolelinux.org (158.36.191.137) on TCP port 80 (www), 30 hops max
1 10.0.2.1 0.600 ms 0.584 ms 0.463 ms
2 10.63.152.1 1.815 ms 1.180 ms 2.829 ms
3 10.202.63.1 6.108 ms 9.127 ms 4.525 ms
4 10.200.193.17 5.414 ms 5.449 ms 5.234 ms
5 85.221.22.129 5.115 ms 5.433 ms 6.469 ms
6 maintainer.skolelinux.no (158.36.191.137) [open] 6.783 ms 7.073 ms 5.773 ms
tjener:~#
OleA
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