Date: Fri, 6 Jan 2012 17:41:46 -0800 From: prabhakar lakhera <prabhakar.lakhera@gmail.com> To: freebsd-net@freebsd.org Subject: Ipv6 gw address scope limited by redirect? Message-ID: <CALg%2BrhV8ivVcN-voOZGYVpsNR5oE14Zf5zr8Soj=nwK1QGOQgA@mail.gmail.com>
next in thread | raw e-mail | index | archive | help
Hi,
The RFC 4861 (ND) states the following for the icmpv6 redirect:
Source Address
MUST be the link-local address assigned to the
interface from which this message is sent.
This combined with the following in icmp6_redirect_input ensures that
if a static default route was installed with non-LLA scoped gw the
redirect sent by the router will go waste.
if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2354 nd6log((LOG_ERR,
2355 "ICMP6 redirect rejected; "
2356 "not equal to gw-for-src=%s (must be same): "
2357 "%s\n",
2358 ip6_sprintf(ip6buf, gw6),
2359 icmp6_redirect_diag(&src6, &reddst6,
&redtgt6)));
2360 RTFREE_LOCKED(rt);
2361 goto bad;
2362 }
Does it mean that if we want to be concerned with redirects we should
ensure only LLA is given as the gw in the indirect routes?
Best,
Prabhakar
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CALg%2BrhV8ivVcN-voOZGYVpsNR5oE14Zf5zr8Soj=nwK1QGOQgA>