Date: Mon, 04 Nov 2002 16:04:40 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Kelly Yancey <kbyanc@posi.net> 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: <3DC70B18.2217E01F@mindspring.com> References: <20021104153745.X50554-100000@gateway.posi.net>
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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
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