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New Member

Need Help w/2511 Terminal Server

Hi, This questions pertains to my home lab for CCNA/CCNP training use. I have a 2511 router set up as a terminal server and I am having problems connecting to the other routers and switches in my lab using reverse telnet.

I have the 2511 configured as per the various documentation available from Cisco (online and in the Cisco Press CCNA practical Studies guide).When I try to open a telnet session (from the router or a PC) the session opens but I never get a prompt from the target router, it just kinda hangs though I can ctrl-shift-6, X my way out. If I try to telnet to a switch (Cat1900) I get a connection denied by host error (this seems like a different problem, probably related to the switch config?).

I am able to connect through the console ports of all routers and switches directly from a PC serial port with no problem.

Any suggestions would be appreciated.

Thanks,

Greg.

Toronto, Canada.

6 REPLIES
Silver

Re: Need Help w/2511 Terminal Server

make sure that 'no exec' is not configured on the line that you aree trying to conenct to , i.e the console or aux of router or switch

New Member

Re: Need Help w/2511 Terminal Server

'no exec" is not configured on con 0 on any of the routers. I am able to telnet from the 2511 to the 2521 through the serial connection and from the 2521 to the 2501's (two of them) through the serial connections on the 2521. I am able to connect through the console connection directly to any of the routers and switches. It is only through reverse telnet that I am having problems.

New Member

Re: Need Help w/2511 Terminal Server

I met same question.

and the problem maybe the following

the sequence of octal cable is wrong. e.g, the first should be third, or others,

everytime, use one cable to connect one router, then try

telnet x.x.x.x 2001, or 2002, 2003, etc.

Toronto, Ca

Bronze

Re: Need Help w/2511 Terminal Server

Could you paste your tty line config from this 2511? Make sure you have "transport input all".

~Zulfi

New Member

Re: Need Help w/2511 Terminal Server

Here's the end of my startup config:

line con 0

password cisco

transport input lat pad v120 mop telnet rlogin udptn nasi

line 1 16

session-timeout 20

exec-timeout 0 0

transport input all

line aux 0

transport input all

line vty 0 4

password cisco

login

!

end

Also, I get this result when I do "sh async status", Not sure if it's relevant or not, I'm was more or less just poking around in the IOS...

Async protocol statistics:

Rcvd: 0 packets, 0 bytes

0 format errors, 0 checksum errors, 0 overrun

Sent: 0 packets, 0 bytes, 0 dropped

No lines currently configured for async protocol usage

I verified last night that I can connect to all routers, and one switch through a direct console connection. It appears that one of my switches has a problem, I get nothing but gibberish from it :-(

New Member

Re: Need Help w/2511 Terminal Server

the config from my AS2511

ip host router1 2004 10.10.10.1

ip host router2 2005 10.10.10.1

line 4

session-timeout 5

location router1

no exec

exec-timeout 15 0

transport input all

stopbits 1

line 5

session-timeout 5

location router2

no exec

exec-timeout 15 0

transport input all

stopbits 1

TS01#router1 2004

Trying router1 (10.10.10.1, 2004)... Open

*** at this point it hangs until I hit enter then I get in

Enter password:

router1>

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