Hi Syed,
On the ASA and IOS Routers this change is made under the crypto map settings as following:
crypto map mymap 10
no set peer old_ip_address
set peer new_ip_address
However there are some specific commands:
ASA 8.3 and earlier:
tunnel-group new_IP_address type ipsec-l2l
tunnel-group new_IP_address ipsec-attributes
pre-shared-key xxxxx
ASA 8.4 and above:
tunnel-group new_IP_address type ipsec-l2l
tunnel-group new_IP_address ipsec-attributes
ikev1 pre-shared-key xxxxx
On IOS you need to update the pre-shared-key as well:
crypto isakmp key 0 xxxxx address new_IP_address no-xauth
HTH.
Portu.
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