AZTCOFW / TECHNICAL GUIDE
Allow ICMP
ICMP echo requests must be allowed on the WAN address that is terminating the tunnel to ensure that it is online and reachable. If ICMP is blocked, the tunnel broker may refuse to setup the tunnel to the IPv4 address. Edit the ICMP rule made earlier in this section, or create a new rule to allow ICMP echo requests. Set the source IP address of the Server IPv4 Address in the tunnel configuration as shown in Figure 60: Example ICMP Rule to ensure connectivity.
Imported from the AZTCOFW knowledge base on 2026-09-05. Historical guidance may refer to older software versions. Confirm applicability before changing a production system.
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