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I was having difficulties maintaining a VPN connection between two of
our customer's stores. For reference, I have included the IPSEC
configuration on the Cisco router at the bottom of this post. Notice
that I am using hostnames and not IP addresses in this configuation. I
have had mixed results with this type of configuration and this is
related to my current problem. The router kept giving me the following
error in the debug output: IPSEC: Peer myhostname.no-ip.biz's A record
not found, lookup failure. What would cause such an error? I tried
doing an nslookup from the command prompt on the myhostname.no-ip.biz
address and it resolved fine. Is this a quirk of the Cisco router or
is there something wrong with my configuration. Does anyone have any
opinions on using hostnames versus static IP addresses in the IPSEC
configuration? As an aside, I added the static IP address that
myhostname.no-ip.biz currently resolves to as one of my peers and the
VPN came up instantly. Any and all help is appreciated. Thank you.

crypto isakmp policy 1
encr 3des
authentication pre-share
group 2
lifetime 82800
crypto isakmp key 123 address 0.0.0.0 0.0.0.0
crypto isakmp key 123 hostname myhostname.no-ip.biz no-xauth
crypto isakmp identity hostname
crypto isakmp keepalive 60 5 periodic
!
crypto isakmp peer address 0.0.0.0
!
crypto ipsec security-association lifetime seconds 82800
!
crypto ipsec transform-set ESP esp-3des esp-sha-hmac
!
crypto map mymap 10 ipsec-isakmp
set peer myhostname.no-ip.biz dynamic
set transform-set ESP
match address 101