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Re: ICMP router advertisement (ipv4)

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Le 9 avril 2023 Tim Woodall a écrit :

>>> Apr  9 06:27:48 ... IN=isp OUT= MAC=... SRC=1.0.168.192 DST=224.0.0.1 ... PROTO=ICMP TYPE=9 CODE=0

This log is generated on your host? It comes directly from syslog or from
a reporting tool?

> I don't get a routable IPv4 address at all. My router is doing DS-lite
> to emulate IPv4 connectivity.

your host have ipv6 and ipv4 addresses or only ipv4 ?
on your host can you give
ip route
ip -6 route
ip address

obfuscate if you want but let internal addresses, it's not a security
hole

> More annoyingly, there doesn't seem to be any way to tell the router
> what the next hop router is for IPv6 and it doesn't forward packets for
> any IP it doesn't know about - even with the firewall turned off.

this is correct, it needs to know where you are to send you packets
icmp type 9 are for that

> So, even though it advertises a /57 on its internal interface, I'm being
> forced to do NAT in order to have a firewall.

I don't understand : if it don't forward, where do you do NAT ?

> I cannot see packets for any address other than those in one /64
> although a traceroute shows they're getting to the router.

You mean you have addresses on the /57 but you can't contact other /64 ?
it seems like a subnet restriction set on the router, and rather common
only a configuration point

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Thread

ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-09 09:40 +0200
  Re: ICMP router advertisement (ipv4) Michel Verdier <mv524@free.fr> - 2023-04-09 10:40 +0200
    Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-09 17:30 +0200
      Re: ICMP router advertisement (ipv4) Michel Verdier <mv524@free.fr> - 2023-04-09 21:40 +0200
        Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-10 05:10 +0200
          Re: ICMP router advertisement (ipv4) Jeremy Ardley <jeremy@ardley.org> - 2023-04-10 05:20 +0200
            Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-10 06:50 +0200
              Re: ICMP router advertisement (ipv4) Jeremy Ardley <jeremy@ardley.org> - 2023-04-10 07:00 +0200
                Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-10 20:30 +0200
                Re: ICMP router advertisement (ipv4) Jeremy Ardley <jeremy@ardley.org> - 2023-04-11 00:40 +0200
                Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-11 05:50 +0200
                Re: ICMP router advertisement (ipv4) Jeremy Ardley <jeremy@ardley.org> - 2023-04-11 06:10 +0200
                Re: ICMP router advertisement (ipv4) debian-user@howorth.org.uk - 2023-04-11 10:30 +0200
                Re: ICMP router advertisement (ipv4) Anssi Saari <as@sci.fi> - 2023-04-11 13:30 +0200
                Re: ICMP router advertisement (ipv4) Dan Ritter <dsr@randomstring.org> - 2023-04-11 15:50 +0200
                Re: ICMP router advertisement (ipv4) Anssi Saari <as@sci.fi> - 2023-04-12 08:50 +0200
                Re: ICMP router advertisement (ipv4) Dan Ritter <dsr@randomstring.org> - 2023-04-12 12:40 +0200
              Re: ICMP router advertisement (ipv4) Tim Woodall <debianuser@woodall.me.uk> - 2023-04-10 07:00 +0200

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