Can anybody help with session disruption when using dual tunnels.
Situation:
LAN1/LAN2 ASL |CheckPoint FW| ZyWALL2WE RemLAN
Required:
Traffic from both LAN1 (172.16.0.0/16) and LAN2 (172.17.0.0/16) to RemLAN (172.31.3.0/24)
Implementation:
While on the ZyWALL it is not possible for LAN2 to be routed through the tunnel of the LAN1, 2 tunnels are defined. Same tunnel configs {PSK, Phase1: [3DES/MD5, DH2, 28800s], Phase2: (AES/SHA1, PFS-DH2, 14444s)}, only difference is LAN1 and LAN2 subnets.
Problem:
When rekeying is needed, on the remote side errors are reported about the rekey event, ie. the ID is found to be invalid and the rekey is retried a couple of time followed by a complete renegotiation of both tunnels.
This leads to disruption of sessions that are open all day.
Is there a solution
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