[Openswan Users] KLIPS 2.4.x set tcp window to 0

[Marco Berizzi]

Paul Wouters wrote:

>What happens if you toggle /proc/sys/net/ipv4/tcp_window_scaling or change
>the settings in /proc/sys/net/ipv4/tcp_adv_win_scale ?

nothing good :-(

>Try setting /proc/sys/net/ipv4/tcp_window_scaling to 0 and
>see if that fixes your issues with NT4.

I tried echo 0 > /proc/sys/net/ipv4/tcp_window_scaling: same problem (KLIPS 
2.4.4 & NT 4.0).
Here is tcpdump output: tcp_windows_scaling set to 0 and tcp_adv_win_scale 
set to 2 (default).

10:05:31.589165 IP (tos 0x0, ttl 127, id 8193, offset 0, flags [DF], proto: 
TCP (6), length: 44) 10.1.3.1.1054 > 172.18.1.13.3389: S, cksum 0xce51 
(correct), 56920:56920(0) win 8192 <mss 1460>

10:05:31.612178 IP (tos 0x0, ttl 127, id 24690, offset 0, flags [DF], proto: 
TCP (6), length: 44) 172.18.1.13.3389 > 10.1.3.1.1054: S, cksum 0xcc51 
(correct), 1233696302:1233696302(0) ack 56921 win 8760 <mss 1460>

10:05:31.612569 IP (tos 0x0, ttl 127, id 8449, offset 0, flags [none], 
proto: TCP (6), length: 40) 10.1.3.1.1054 > 172.18.1.13.3389: R, cksum 
0x27b1 (correct), 56921:56921(0) win 0

I tried to increase also tcp_adv_win_scale (2,4,8,16,32,64...), but same 
problem (tcp_windows_scaling was set to 0).