VPN via ISDN idle problem

Currently we are implementing a cisco 2600 with IOS encryption as software

a central hub router (it will become later a 3662) - which has a static

external address.

Then we have a cisco 801 IOS encryption software connection

address assigned to it on a dynamic ISDN.

I have configured the standard set of cryptographic cards, etc. on the 800 along

with the dynamic encryption on 2600 map - I get a built tunnel

successfully and the traffic is passed without problem. However if you then call

idling outside and comes back up the 800 to get a different address and when

He's trying to communicate to the 2600 it fails. -With a clear HIS Crypto on the 800

everything works again. On debugging etc. further, I can see that the 800 Initializes a new connection to the 2600, but based in this regard on the old address assigned to its Dialer previously. Of course, the 2600 responds but sent to the old address of the 800. This is illustrated with the crypto ipsec HS its 800 which gives the following:(Ip addr changed)

Interface: Dialer1

Tag crypto map: map20, local addr. 62.7.42.112

local ident (addr, mask, prot, port): (10.5.21.0/255.255.255.0/0/0)

Remote ident (addr, mask, prot, port): (2.0.0.0/255.0.0.0/0/0)

current_peer: 213.1.195.147

LICENCE, flags is {origin_is_acl},

#pkts program: encrypt 0, #pkts: 0, #pkts 0 digest

#pkts decaps: 0, #pkts decrypt: 0, #pkts check 0

compressed #pkts: 0, unzipped #pkts: 0

#pkts uncompressed: 0, #pkts compr. has failed: 0, #pkts decompress failed: 0

Errors #send 0, #recv 0 errors

local crypto endpt. : 62.7.60.179, remote Start crypto. : 213.1.195.147

Path mtu 1500, media, mtu 1500

current outbound SPI: 0

SAS of the esp on arrival:

the arrival ah sas:

entrants CFP sas

You can see that the 800 knows its interface has changed address, but he still has the old address as the endpoint local crypto.

Anyone have any ideas on a solution?

I tried to shorten the life of the Ipsec without real success.

Thanks in advance

Jason Sharples

It looks like bug CSCin10546 .

You can check the toolkit of bug here: http://www.cisco.com/kobayashi/support/tac/t_index.shtml .

There are interim versions that has the fix for it.

Kind regards

Tags: Cisco Security

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