Date: Mon, 4 Nov 2002 17:22:13 -0800 (PST) From: Kelly Yancey <kbyanc@posi.net> To: Terry Lambert <tlambert2@mindspring.com> Cc: Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>, Doug Barton <DougB@FreeBSD.org>, <freebsd-current@FreeBSD.org>, <kbyanc@FreeBSD.org> Subject: Re: Can't resolve hosts via dns on the command line with latest-current Message-ID: <20021104171257.G50723-100000@gateway.posi.net> In-Reply-To: <3DC70B18.2217E01F@mindspring.com>
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On Mon, 4 Nov 2002, Terry Lambert wrote:
> Kelly Yancey wrote:
> > It doesn't matter. It isn't just DNS lookups, mountd fails to run too
> > because it cannot connect to portmap via localhost. Oddly, in both cases
> > sendto() is returning with errno = 49 (EADDRNOTAVAIL). I've tracked it down
> > to this code in sys/netinet/ip_output.c:
> >
> > /* 127/8 must not appear on wire - RFC1122. */
> > if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
> > (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
> > if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
> > ipstat.ips_badaddr++;
> > error = EADDRNOTAVAIL;
> > goto bad;
> > }
> > }
> >
> > Which was last modified in revision 1.150 back in February. However, I
> > still don't see how adding an extra counter to the sockbuf could possibly
> > change the set of events required to get to this code, but it is certainly
> > what is causing EADDRNOTAVAIL to be returned. Needless to say, I'm still
> > researching it.
>
> Pretty clear, I should think:
>
> IF the source address is a loopback address
> OR the destination address is a loopback address
> THEN
> IF the interface does not have the IFF_LOOBACK flag
> return EADDRNOTAVAIL
>
> ...pretty clearly, the new loopback interface doe not set the flag
> IFF_LOOPBACK on the interface, as it is supposed to do.
>
> -- Terry
>
No, it turns out I'm an idiot: somehow the address on loopback got deleted
so it was trying to use my default route. So I was on a wild goose chase. :|
Oddly enough, though, once I re-added 127.0.0.1/8 to my localhost:
# cat resolv.conf
search nttmcl.com
nameserver 127.0.0.1
# ps auwwwx | grep named
root 320 0.0 0.8 2600 2160 ?? Is 5:11PM 0:00.03 named
# ping www.freebsd.org
PING www.freebsd.org (216.136.204.117): 56 data bytes
64 bytes from 216.136.204.117: icmp_seq=0 ttl=50 time=16.343 ms
64 bytes from 216.136.204.117: icmp_seq=1 ttl=50 time=8.764 ms
^C
--- www.freebsd.org ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 8.764/12.553/16.343/3.789 ms
# ping www.yahoo.com
<blocks forever>
Go figure. I've said it before and I'll say it again...I'm working on it.
:|
Kelly
--
Kelly Yancey -- kbyanc@{posi.net,FreeBSD.org}
"Though [the people] may acquiesce, they cannot approve what they do not
understand." --Thomas Jefferson, 1792.
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