[NTLUG:Discuss] filtering incoming connections using the TOS thingie ( or some other TCP bits )

[Jack Snodgrass]

Say that I am running a ssh server on port 22. 
Normally, if you do 
telnet servername 22
you get: 
Connected to linux.private.net (xx.xx.xx.xx).
Escape character is '^]'.
SSH-1.99-OpenSSH_3.9p1
....

I'd like to be able to 
1) set up filtering on my server so that only certain 
connect packets are answered... IP filtering is not enough. 
2) set up something on the initial connect from the client 
to trigger #1 above. 


Can you do this is TOS and packet mangleing? 

Thanks - jack