Zyxel USG 60 [219/327] What could go wrong

Zyxel USG 60 [219/327] What could go wrong
Chapter 4 Create Site-to-Site VPN Tunnels
ZyWALL/USG Series Handbook
219
Figure 461 Spoke_Branch_B > MONITOR > VPN Monitor > IPSec
4.9.8 What Could Go Wrong?
1 If you see [info] or [error] log message such as below, please check ZyWALL/USG Phase 1 Settings.
All ZyWALL/USG units must use the same Pre-Shared Key, Encryption, Authentication method, DH
key group and ID Type to establish the IKE SA.
Figure 462 MONITOR > Log
2 If you see that Phase 1 IKE SA process done but still get [info] log message as below, please check
ZyWALL/USG Phase 2 Settings. All ZyWALL/USG units must use the same Protocol, Encapsulation,
Encryption, Authentication method and PFS to establish the IKE SA.
Figure 463 MONITOR > Log
3 Make sure the all ZyWALL/USG units’ security policies allow IPSec VPN traffic. IKE uses UDP port
500, AH uses IP protocol 51, and ESP uses IP protocol 50.
4 By default, NAT traversal is enabled on ZyWALL/USG, so please make sure the remote IPSec device
also has NAT traversal enabled.

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