Questions tagged as ['icmpv6']

Internet Control Message Protocol version 6 (ICMPv6) is the implementation of the Internet Control Message Protocol (ICMP) for Internet Protocol version 6 (IPv6). ICMPv6 is defined in RFC 4443. ICMPv6 is an integral part of IPv6 and performs error reporting and diagnostic functions (e.g., ping).
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Can safely block these ICMPv6 message types on a web server?
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I have a Debian 11 VPS on a cloud provider, with both IPv4 and IPv6 enabled and the eth0 interface with both a global-scoped ipv6 address (public) and a link-scoped ipv6 address (fe80::/10).

The sole purpose of the server is to host a public website.

I’m implementing a firewall on the server using iptables/ip6tables. I read RFC4890 but still not sure how to handle some ICMPv6 message types and if  ...

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Netflow records with Destination Ports 1025,257 and Protocol as ipv6-icmp
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I have some Netflow records from a bunch of routers. The records contain IPv6 flows and there are entries with protocol as ipv6-icmp and their destination port values as 0, 1025 and 257. I know from this link that the value of 0 for ipv6-icmp in netflow indicates an echo reply. Is there any resource to find the meaning of the ipv6-icmp-1025 and ipv6-icmp-257?

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Force IPv6 NS source to be global instead of link
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In summary, how can I force an interface to use the global IPv6 address as the source for neighbor solicitation messages rather than the link address?

Background: Many VPS providers do not allocate a routed IPv6 /64 but merely assign a block on a /48. The gateway is a global IPv6 address on the /48 but outside the /64. The gateway responds to NS messages sent from a global address, but does not re ...