Fluctuating WAN IP with Dynamic DNS in Sophos Gateway Firewalls

Question

I was seeking a solution for an issue encountered with my client&rsquo;s Sophos Gateway Firewall (Site-to-Site IPsec VPN Setup), which was due to the ISP&rsquo;s PPPoE Service causing frequent changes in the WAN Interface IP. 
 I&rsquo;ve learned that Dynamic DNS could be a viable solution for the fluctuating WAN IP. With Dynamic DNS&mdash;a third-party service&mdash;we can utilize the hostname of the Gateway Firewall instead of the WAN IP. Therefore, my question is: In Sophos Firewall, Can we use the &ldquo;hostname&rdquo; in place of the WAN IP in the site-to-site VPN configuration, specifically in the Remote Gateway settings, to accommodate Dynamic DNS?

Mayur Makvana · Answer

Hello Mohammed Minhaz , 
 You need to use the DDNS name provided in DDNS configuration for the remote gateway settings. 
 Kindly refer to the KBA about configuring the DDNS: 
 https://docs.sophos.com/nsg/sophos-firewall/19.0/Help/en-us/webhelp/onlinehelp/AdministratorHelp/Network/DynamicDNS/NetworkDynamicDNSProviderAdd/index.html