On 4/28/2011 7:09 AM, Allan Pinto wrote: > > Hi, > i run a lot telnet scripts using /dev/tcp for cisco routers, lately we > have newer models of cisco routers which have ios-xr which is based on > linux and also some mikrotik routers which are again based on linux, > on these devices when i run my script all i get is ÿý^Xÿý > ÿý#ÿý'ÿý$ÿý! in my output, no username prompt, on the same device if > if use a netcat -T option which is for telnet negotiation, it works, > Could anyone guide me in the right direction where i can achieve the > same using /dev/tcp > below example script > > #!/bin/bash > > exec 3<>/dev/tcp/$1/23 > sleep 1 > echo -e "username">&3 > echo -e "password">&3 > echo -e "sh ver">&3 > #sleep 2 > echo -e "logout">&3 > cat<&3 > $1.txt >
Hi, Telnet is not just a pipe. It is a real protocol. Though, rather a simple one. What you see is a telnet options negotiation. See http://www.faqs.org/rfcs/rfc854.html for details. Ilya Bobyr
