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Re: Command to Display Prefixes and Default router entries in Linux

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Dheeraj Kandula <dkandula@gmail.com> writes:

> Thanks Povl.
>
> In the "ip neighbor" output, I see entries listed with "router". Maybe it
> is a RA Default router learnt entry.

Nope.  That's the 'router' flag in the neigbour advertisment.  Lots of
systems will set this flag without sending RAs. Linux will set it if
forwarding is enable on the interface where the NA is going out.

>From net/ipv6/addrconf.c:

        /* send unsolicited NA if enabled */
        if (send_na &&
            (ifp->idev->cnf.ndisc_notify ||
             dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
                ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
                              /*router=*/ !!ifp->idev->cnf.forwarding,
                              /*solicited=*/ false, /*override=*/ true,
                              /*inc_opt=*/ true);
        }


Bjørn

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Thread

Command to Display Prefixes and Default router entries in Linux Dheeraj Kandula <dkandula@gmail.com> - 2022-06-23 17:10 +0200
  Re: Command to Display Prefixes and Default router entries in  Linux Povl Ole Haarlev Olsen <poho@stderr.dk> - 2022-06-23 20:30 +0200
    Re: Command to Display Prefixes and Default router entries in Linux Dheeraj Kandula <dkandula@gmail.com> - 2022-06-23 21:20 +0200
      Re: Command to Display Prefixes and Default router entries in Linux Bjørn Mork <bjorn@mork.no> - 2022-06-24 10:10 +0200
        Re: Command to Display Prefixes and Default router entries in Linux Dheeraj Kandula <dkandula@gmail.com> - 2022-06-24 17:10 +0200

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