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When I set up IPv6 I learned that you have to let some things through your firewall, like ICMP, because the IPv6 protocol relies on it. When I blocked everythin
by chrisper 9y ago
When I set up IPv6 I learned that you have to let some things through your firewall, like ICMP, because the IPv6 protocol relies on it. When I blocked everything like I did with ipv4, it eventually stopped working.
- cesarb 9y agoIf you block everything with IPv4, things stop working too: you have to allow at least some ICMP (for "packet too big" path MTU discovery), otherwise you will have hard-to-diagnose issues.
- jsjohnst 9y agoLess an issue with IPv4 in a consumer sense because the device blocking the ICMP is also commonly doing NAT too.