I'm having a problem that I just can't seem to figure out. I have a suse 10.1 server configured as an internet gateway. I manage the network for a small ISP. I have a customer who has a 1710 cisco on the internal side of my network and 7140 cisco on theirs. All the Ip address used are internet accessible. The problem that seems to be happening is that the gateway seems to be intercepting the IKE negations instead of letting them pass on to the 1710. The ports/protocols that are being used are Gre, Udp 500,and Esp.

Note: I changed the ip address to 123.123.123.1 from the original ip address.
123.123.123.1 signifies my suse 10.1 gateway.

Any help on this will be most appreciated.

This log is from the 7140 cisco device.

1d01h: ISAKMP (0:0): received packet from 123.123.123.1 (N) NEW SA
1d01h: ISAKMP: local port 500, remote port 500
1d01h: ISAKMP (0:195): Input = IKE_MESG_FROM_PEER, IKE_MM_EXCH
Old State = IKE_READY New State = IKE_R_MM1

1d01h: ISAKMP (0:195): processing SA payload. message ID = 0
1d01h: ISAKMP (0:195): No pre-shared key with 123.123.123.1!
1d01h: ISAKMP (0:195): Checking ISAKMP transform 1 against priority 1 policy
1d01h: ISAKMP: encryption DES-CBC
1d01h: ISAKMP: hash MD5
1d01h: ISAKMP: default group 1
1d01h: ISAKMP: auth pre-share
1d01h: ISAKMP: life type in seconds
1d01h: ISAKMP: life duration (VPI) of 0x0 0x1 0x51 0x80
1d01h: ISAKMP (0:195): Preshared authentication offered but does not match policy!
1d01h: ISAKMP (0:195): atts are not acceptable. Next payload is 3
1d01h: ISAKMP (0:195): Checking ISAKMP transform 2 against priority 1 policy
1d01h: ISAKMP: encryption 3DES-CBC
1d01h: ISAKMP: hash MD5
1d01h: ISAKMP: default group 2
1d01h: ISAKMP: auth pre-share
1d01h: ISAKMP: life type in seconds
1d01h: ISAKMP: life duration (VPI) of 0x0 0x1 0x51 0x80
1d01h: ISAKMP (0:195): Encryption algorithm offered does not match policy!
1d01h: ISAKMP (0:195): atts are not acceptable. Next payload is 0
1d01h: ISAKMP (0:195): Checking ISAKMP transform 1 against priority 65535 policy
1d01h: ISAKMP: encryption DES-CBC
1d01h: ISAKMP: hash MD5
1d01h: ISAKMP: default group 1
1d01h: ISAKMP: auth pre-share
1d01h: ISAKMP: life type in seconds
1d01h: ISAKMP: life duration (VPI) of 0x0 0x1 0x51 0x80
1d01h: ISAKMP (0:195): Hash algorithm offered does not match policy!
1d01h: ISAKMP (0:195): atts are not acceptable. Next payload is 3
1d01h: ISAKMP (0:195): Checking ISAKMP transform 2 against priority 65535 policy
1d01h: ISAKMP: encryption 3DES-CBC
1d01h: ISAKMP: hash MD5
1d01h: ISAKMP: default group 2
1d01h: ISAKMP: auth pre-share
1d01h: ISAKMP: life type in seconds
1d01h: ISAKMP: life duration (VPI) of 0x0 0x1 0x51 0x80
1d01h: ISAKMP (0:195): Encryption algorithm offered does not match policy!
1d01h: ISAKMP (0:195): atts are not acceptable. Next payload is 0