From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Miller" Subject: Fw: Re: 2.6.11-rc2 TCP ignores PMTU ICMP (Re: Linux 2.6.11-rc2) Date: Thu, 27 Jan 2005 15:41:18 -0800 Message-ID: <20050127154118.45e59991.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: To: netfilter-devel@lists.netfilter.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-devel-bounces@lists.netfilter.org Errors-To: netfilter-devel-bounces@lists.netfilter.org List-Id: netfilter-devel.vger.kernel.org Hey guys, please try to take a look at this one. There are multiple confirmations that merely having ipt_MASQUERADE loaded or built into the kernel causes PMTU ICMP messages to be ignored in the current kernel. I suspect this is more fallout from Rusty's recent conntrack/nat stuff. Maybe it'll result in some more nfsim testcases being added, so perhaps not such a bad thing afterall :-) Begin forwarded message: Date: Thu, 27 Jan 2005 15:11:57 -0800 From: David Brownell To: Janos Farkas Cc: David Ford , linux-kernel@vger.kernel.org, netdev@oss.sgi.com, Art Haas Subject: Re: 2.6.11-rc2 TCP ignores PMTU ICMP (Re: Linux 2.6.11-rc2) I just got an interesting "I see these problems too" report. It may provide a useful clue. According to "Art Haas" : > I'm running the current BK kernel now, and I'm not seeing the problems > right now because, I found, I do not have some of the IP masquerading > modules installed on my machine. When these modules get installed then > the cvs/rsync problems appear. I do have CONFIG_IP_NF_TARGET_MASQUERADE=y on the system where I'm seeing this, though it's not doing anything just now. Haven't yet made time to see if disabling it improves things ... but if that's a factor, it could explain why more people aren't suffering with this problem. - Dave