I have sshd(openssh3.5p1) server running on my router and when i run tcpjunk to that port, sshd gets killed after some time

192.168.71.1 is my sshd server and 192.168.71.4 is my client from where i send my dos attack

This is the tcpjunk command i gave to the ssh server

#tcpjunk -s 192.168.71.1 -p 22 -c req -i 100
req session file contains string <fuzz any 100>

below attached is the netstat output. They are lot of these like these but i just pasted two lines for reference

#netstat -an|grep ":22"
tcp 0 0 192.168.71.1:22 192.168.71.4:37757 TIME_WAIT
tcp 0 0 192.168.71.1:22 192.168.71.4:55207 TIME_WAIT
...
...

...

...


Can any one on tell me where in the openssh code i have to search to find out the root cause for this issue


Thanks a lot in advance

Do you mean "gets killed" as in it segfaults or as in it simply stops taking connections? sshd has code to limit the number of connects built-in as a security measure. If it's segfaulting or hanging, then maybe build a debug version of the binary and run it under gnu debug (gdb) while doing your testing. When it stops, look at the code and line number for the source that gdb gives you (make sure to include debug symbols in the binary) and focus your search there.