Odd tcp dump? was: ssh working with dialup, not through router

[shrek-m at gmx.de]

M. Fioretti wrote:

>still trying to track why ssh doesn't work anymore, see my original
>posting.
>

1.
firewall,
ssh is really open ?


$ nmap -P0 -p 22 server_ip
 
Starting nmap 3.48 ( http://www.insecure.org/nmap/ ) at 2004-05-18 22:37 
CEST
Interesting ports on xp1800 (127.0.0.1):
PORT   STATE SERVICE
22/tcp open  ssh
 
Nmap run completed -- 1 IP address (1 host up) scanned in 0.138 seconds



2.
tcp_ecn - problem ?

# sysctl -a | grep ecn
net.ipv4.tcp_ecn = 0

<snip>

The recommended solutions require to turn off ECN support

sysctl and /etc/sysctl.conf
(Add net.ipv4.tcp_ecn = 0 to sysctl.conf)
</snip>


3.
your router does not close the connection after 1 minute of inactivity or similiar ?
ping your_server while you try to ssh in



-- 
shrek-m