Date: Thu, 18 Dec 2008 13:00:10 GMT From: "Remko Lodder" <remko@elvandar.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/129730: respond with wrong ARP. Message-ID: <200812181300.mBID0AZT076874@freefall.freebsd.org>
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The following reply was made to PR kern/129730; it has been noted by GNATS.
From: "Remko Lodder" <remko@elvandar.org>
To: "KOIE Hidetaka" <koie@suri.co.jp>
Cc: freebsd-gnats-submit@freebsd.org,
qingli@FreeBSD.org
Subject: Re: kern/129730: respond with wrong ARP.
Date: Thu, 18 Dec 2008 13:56:04 +0100 (CET)
> I built FreeBSD-current at 2008-12-18, and boot it.
>
> Some machine in my network cannot connect a DNS server...
> The finding is my FreeBSD machine responds to ARP request for a 3rd
> machine with a wrong ARP response like this:
>
> 6:50:26.320648 00:1b:78:9a:47:db > Broadcast, ethertype ARP (0x0806),
> length 42: arp who-has 10.1.100.1 tell 10.1.6.59
> 16:50:26.320784 00:e0:81:74:ef:e4 > 00:1b:78:9a:47:db, ethertype ARP
> (0x0806), length 60: arp reply 10.1.100.1 is-at 00:1b:78:9a:47:db
> 16:50:26.320851 00:30:48:99:64:8c > 00:1b:78:9a:47:db, ethertype ARP
> (0x0806), length 60: arp reply 10.1.100.1 is-at 00:30:48:99:64:8c
> # 00:1b:78:9a:47:db is a requester (10.1.6.59).
> # 00:e0:81:74:ef:e4 is my machine (10.1.3.67).
> # 00:30:48:99:64:8c is a real responder (10.1.100.1).
>
> line 1 is ARP request.
> line 2 is ARP response by my machine with wrong.
> line 3 is ARP correct response.
>
> note: bridging and proxyall are not specified on my machine.
>
>>How-To-Repeat:
>
>>Fix:
> I don't know. (but, a bug may be in r186119).
>
> Now, to suppress the wrong behavior,
> Index: if_ether.c
> ===================================================================
> RCS file: /.../.../src/sys/netinet/if_ether.c,v
> retrieving revision 1.187
> diff -u -p -r1.187 if_ether.c
> --- if_ether.c 17 Dec 2008 00:14:28 -0000 1.187
> +++ if_ether.c 18 Dec 2008 08:52:44 -0000
> @@ -660,6 +660,7 @@ reply:
> (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
> (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln);
> } else {
> +goto drop; /*KOIE*/
> if (la == NULL) {
> if (!V_arp_proxyall)
> goto drop;
>
Hello,
I seem to be hitting the same behaviour, I did a roll back last night, and
need to finish testing with this. I'll reply-all when I have more
information about this.
Cheers,
remko
--
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