VPN on Router and See the port block and open

Unanswered Question
Jan 11th, 2009
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Dear All,

could you show me some command on router.

Let me tell you about my issue.i had HQ and Branch link by Lease Line and configuration did VPN command.and access-list command i was permit rand ip address...my issue is ATM at branch some time can communication with HQ some time cannot communication with HQ...so i would like to know on the router and make sure the router it block or not block.

Note: on my confige not block port...

Best Regards,


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rajivrajan1 Sun, 01/11/2009 - 23:48
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even your mail is not detailing the network,im guessing following things.

1.This is a bank network

2.Branch(ATM) is having IPSEC configured

3.Contacting ATM server in data center for operations.

You may check in the router wthr the IPSEC Tunnel is created or not.

1.Sh cry isa sa

2.You may give an extended ping / trace to your server from router

(extended ping command sequence you may chek in cisco.com)

3.you can telnet the serverport with source inerface as fastethernet of router

telnet < server-ip> / source-int f

I ll suggest to keep a continous ping with low datagram size to server, from ATM PC, so that the tunnel will not go down and ur ATM will stay up always.

rechard_david Mon, 01/12/2009 - 20:47
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dear Rajivrajan1,

Thank you for your reply...:)

1.yes, i sho cry issa sa already it connected.

2.i can ping from ATM to server and Server to ATM it reply also tracert.... working not request time out..

3.i can telnet port on ATM from server and from ATM ...

my issue is some time ATM is working but some time doesn't work , i worry sometime cisco block port or .....so i would like to know which command what i can control and i really want to make sure that all cisco fine and ATM or server have problem.....

How can i control connection .....?

best Regards,



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