From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.62) (envelope-from ) id 1HESH0-0001JK-3Q for garchives@archives.gentoo.org; Tue, 06 Feb 2007 15:30:23 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l16FTebB002413; Tue, 6 Feb 2007 15:29:40 GMT Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l16FRjDN032644 for ; Tue, 6 Feb 2007 15:27:46 GMT Received: from localhost (localhost [127.0.0.1]) by smtp.gentoo.org (Postfix) with ESMTP id A4EB264BE4 for ; Tue, 6 Feb 2007 15:27:44 +0000 (UTC) X-Virus-Scanned: amavisd-new at gentoo.org X-Spam-Score: -0.483 X-Spam-Level: X-Spam-Status: No, score=-0.483 required=5.5 tests=[AWL=0.830, BAYES_00=-2.599, HTML_40_50=0.496, HTML_MESSAGE=0.001, NORMAL_HTTP_TO_IP=0.175, SARE_URI_NUM_SUBDOM=0.614] Received: from smtp.gentoo.org ([127.0.0.1]) by localhost (smtp.gentoo.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id v7rq9Xy5oW+7 for ; Tue, 6 Feb 2007 15:27:37 +0000 (UTC) Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.251]) by smtp.gentoo.org (Postfix) with ESMTP id B327964D08 for ; Tue, 6 Feb 2007 15:27:34 +0000 (UTC) Received: by an-out-0708.google.com with SMTP id c8so1284071ana for ; Tue, 06 Feb 2007 07:27:33 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=datj4eQVD/SyMeWkaMQenT1tTwKCfh7gdKdw5y5ktLiYzEEa+4wcRazrS9OUIqYXoD6bBX0At6CafKdCaNkqf78TqIZWsw0uFa69PM7Vsv41KDesnUqrGXu/MckQcZifteSC01wWkef7nePxjUG5J0ryAX20D37tDIRxMLiI0nw= Received: by 10.114.78.1 with SMTP id a1mr777401wab.1170775652637; Tue, 06 Feb 2007 07:27:32 -0800 (PST) Received: by 10.114.123.7 with HTTP; Tue, 6 Feb 2007 07:27:32 -0800 (PST) Message-ID: Date: Tue, 6 Feb 2007 10:27:32 -0500 From: "Brett Curtis" To: gentoo-server@lists.gentoo.org Subject: [gentoo-server] Re: Can someone confirm? tg3 MTU issues. In-Reply-To: <20070206145300.GA4256@lappy.iwfinancial.net> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-server@gentoo.org Reply-to: gentoo-server@lists.gentoo.org MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_3158_29651037.1170775652548" References: <20070206145300.GA4256@lappy.iwfinancial.net> X-Archives-Salt: 8592652e-4e14-4944-8f30-21dd578fffad X-Archives-Hash: 71d884fb57d9688d18eb61ca7de7431f ------=_Part_3158_29651037.1170775652548 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Sorry to double post but I should have included this info. mtu == 1500 for the following ping -s 5000 172.17.187.220 tcpdump run on 172.17.187.220 tcpdump -n -i eth0 host 172.17.187.221 10:17:53.618060 IP 172.17.187.221 > 172.17.187.220: icmp 10:17:53.618062 IP 172.17.187.221 > 172.17.187.220: icmp 10:17:53.618065 IP 172.17.187.221 > 172.17.187.220: icmp 10:17:53.618095 IP 172.17.187.220 > 172.17.187.221: icmp 1480: echo reply seq 4 10:17:53.618099 IP 172.17.187.220 > 172.17.187.221: icmp 10:17:53.618100 IP 172.17.187.220 > 172.17.187.221: icmp now I lower the mtu ifconfig eth0 mtu 1492 ping -s 5000 172.17.187.220 tcpdump run on 172.17.187.220 tcpdump -n -i eth0 host 172.17.187.221 10:20:03.185397 IP 172.17.187.221 > 172.17.187.220: icmp 10:20:03.185400 IP 172.17.187.221 > 172.17.187.220: icmp 10:20:03.185402 IP 172.17.187.221 > 172.17.187.220: icmp 10:20:03.185433 IP 172.17.187.220 > 172.17.187.221: icmp 1480: echo reply seq 4 10:20:03.185436 IP 172.17.187.220 > 172.17.187.221: icmp 10:20:03.185438 IP 172.17.187.220 > 172.17.187.221: icmp 10:20:03.185440 IP 172.17.187.220 > 172.17.187.221: icmp So as you can see they are the same however the reply never comes back as proved by this tcpdump. tcpdump run on 172.17.187.221 tcpdump -n -i eth0 host 172.17.187.22 10:24:51.105366 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:51.105369 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:51.105371 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:51.105652 IP 172.17.187.220 > 172.17.187.221: icmp 10:24:52.105450 IP 172.17.187.221 > 172.17.187.220: ICMP echo request, id 42519, seq 3, length 1472 10:24:52.105455 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:52.105456 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:52.105458 IP 172.17.187.221 > 172.17.187.220: icmp 10:24:52.105669 IP 172.17.187.220 > 172.17.187.221: icmp 10:24:53.105545 IP 172.17.187.221 > 172.17.187.220: ICMP echo request, id 42519, seq 4, length 1472 On 2/6/07, Brett Curtis wrote: > > have tried everything possible short of testing a different network card > because I do not have one. I have delt with IMB support but since I run > gentoo they are not much if any help at all. I compiled the drivers they > provide with the same results. I tried booting from gentoo live disk.. I > am > running out of ideas. I have tried doing this on different network > switches > differnt cables... and still nothing. > > I can not lower the mtu on *any* on my Broadcom Corporation NetXtreme > nics. > I > have 5 of these boxes! Same results on all. > > my test is this: > > ping -s 5000 somehost.inmy.lan > > works as expected. > > ifconfig eth0 mtu 1492 > ping -s 5000 somehost.inmy.lan > > nothing.. and of course I set my mtu back to 1500 everything works fine. > > I have done this same test with machines with different nics and > everything > works. > > I am building 2.6.20 now in hopes it may fix something. > > Any ideas? > > Thanks > > -- > > Created with VIM & mutt. > > Our comedies are not to be laughed at. -Samuel Goldwyn > > ------=_Part_3158_29651037.1170775652548 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sorry to double post but I should have included this info.

mtu == 1500 for the following

ping -s 5000 172.17.187.220

tcpdump run on 172.17.187.220

tcpdump -n -i eth0 host 172.17.187.221

10:17:53.618060 IP 172.17.187.221 > 172.17.187.220 : icmp
10:17:53.618062 IP 172.17.187.221 > 172.17.187.220: icmp
10:17:53.618065 IP 172.17.187.221 > 172.17.187.220: icmp
10:17:53.618095 IP 172.17.187.220 > 172.17.187.221: icmp 1480: echo reply seq 4
10:17: 53.618099 IP 172.17.187.220 > 172.17.187.221: icmp
10:17:53.618100 IP 172.17.187.220 > 172.17.187.221: icmp

now I lower the mtu

ifconfig eth0 mtu 1492
ping -s 5000 172.17.187.220

tcpdump run on 172.17.187.220

tcpdump -n -i eth0 host 172.17.187.221

10:20:03.185397 IP 172.17.187.221 > 172.17.187.220: icmp
10:20:03.185400 IP 172.17.187.221 > 172.17.187.220: icmp
10:20:03.185402 IP 172.17.187.221 > 172.17.187.220: icmp
10:20:03.185433 IP 172.17.187.220 > 172.17.187.221: icmp 1480: echo reply seq 4
10:20:03.185436 IP 172.17.187.220 > 172.17.187.221: icmp
10:20:03.185438 IP 172.17.187.220 > 172.17.187.221: icmp
10:20: 03.185440 IP 172.17.187.220 > 172.17.187.221: icmp

So as you can see they are the same however the reply never comes back as proved by this tcpdump.

tcpdump run on 172.17.187.221
tcpdump -n -i eth0 host 172.17.187.22

10:24:51.105366 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:51.105369 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:51.105371 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:51.105652 IP 172.17.187.220 > 172.17.187.221: icmp
10:24:52.105450 IP 172.17.187.221 > 172.17.187.220: ICMP echo request, id 42519, seq 3, length 1472
10:24:52.105455 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:52.105456 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:52.105458 IP 172.17.187.221 > 172.17.187.220: icmp
10:24:52.105669 IP 172.17.187.220 > 172.17.187.221: icmp
10:24:53.105545 IP 172.17.187.221 > 172.17.187.220: ICMP echo request, id 42519, seq 4, length 1472

 

On 2/6/07, Brett Curtis <dashnu.mutt@gmail.com> wrote:
have tried everything possible short of testing a different network card
because I do not have one. I have delt with IMB support but since I run
gentoo they are not much if any help at all. I compiled the drivers they
provide with the same results. I tried booting from gentoo live disk.. I am
running out of ideas. I have tried doing this on different network switches
differnt cables... and still nothing.

I can not lower the mtu on *any* on my Broadcom Corporation NetXtreme nics.
I
have 5 of these boxes! Same results on all.

my test is this:

ping -s 5000 somehost.inmy.lan

works as expected.

ifconfig eth0 mtu 1492
ping -s 5000 somehost.inmy.lan

nothing.. and of course I set my mtu back to 1500 everything works fine.

I have done this same test with machines with different nics and everything
works.

I am building 2.6.20 now in hopes it may fix something.

Any ideas?

Thanks

--

Created with VIM & mutt.

  Our comedies are not to be laughed at. -Samuel Goldwyn


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