Note about resilience against DNS name resolution errors and outages

[redneck-f25]

Earlier on Telegram...

[28.04.2026 05:02] Redneck: Hi Simon and community. When a MeshAgent moves to a network without DNS server or bad name resolution, it appears to use the last used IP address. Is this intended? Where is the address stored?

[28.04.2026 05:43] Redneck: I guess, I found it. Resolved hostnames are cached in the DB and reused if resolution fails.

• https://github.com/Ylianst/MeshAgent/blob/master/meshcore/agentcore.c#L4061
• https://github.com/Ylianst/MeshAgent/blob/master/microscript/ILibDuktape_net.c#L570
• https://github.com/Ylianst/MeshAgent/blob/master/microscript/ILibDuktape_net.c#L2555

Thanks

This is a reminder to drop a note about this feature somewhere in the docs.

The MeshAgent caches the last resolved IP-Address for a server in its local database. This avoids connection failures due to DNS name resolution errors and outages.

Covered problems:

• accidently or temporarily deleted DNS records
• outages of local DNS name servers (e.g. Active Directory Domain Controllers)
• outages of DNS name servers operated by the ISP
• outages of DNS name servers like Google's dns.google (8.8.8.8) or Cloudflare's one.one.one.one (1.1.1.1) or others
• misconfigured DNSSEC records as last night
  • https://community.cloudflare.com/t/resolution-issues-for-de-domains/925395
  • https://x.com/dok2001/status/2051780920982528488