From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Subject: NAT trouble (?) with Apple Macbook Pro Date: Mon, 18 Jun 2007 9:25:47 +0200 Message-ID: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-bounces@lists.netfilter.org Errors-To: netfilter-bounces@lists.netfilter.org Content-Type: text/plain; charset="us-ascii" To: netfilter@lists.netfilter.org Greetings, I have been running for the past few years a Linux box to drive my DSL= connection (using an USB modem), and sharing the connection to the rest = of my LAN using Iptables masquerading : iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE I've never had the slightest trouble sharing that connection to my Window= s desktop (and it's been working as well on my Sony PSP). Now I just got = myself an Apple laptop (Macbook Pro), and internet access is working erra= tically (just for that laptop, the Windows desktop still works just fine)= . The symptoms : some (not many) web sites work normally. Many others won't= display, going into timeout, typically while waiting for images to load = (sometimes, I can even get the page layout and text, but never get the pi= ctures). On the other hand, I've been able to establish stable SSH connec= tions through the NAT box. I am pretty sure the problem doesn't come from : - the kind of connection between the laptop and the Linux NAT box, as I g= et the exact same symptoms using wireless or a wired link - MacOS, as I've also installed Windows on the laptop, and the symptoms p= ersist - the browser, as I've had the same trouble with Safari, Firefox and Inte= rnet Explorer - some kind of hardware defect in the laptop, as everything works just fi= ne when using my neighbour's internet access Therefore, I believe the problem to come from the laptop-NAT box interact= ion. I tried playing around with the MTU, without success. The only expla= nation left to me would be trouble at the NAT level, though I can't even = remotely picture why it would only affect that laptop. The Linux box is an Ubuntu 6.10, running kernel 2.6.15(ubuntu version : -= 28), and Iptables 1.3.3 (ubuntu version : -2ubuntu4). Is there any way I can trace the NAT activity to check whether the proble= m stems from that or not? Thanks in advance, Daniel