From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jan" Subject: Netfilter and multiple internet connections Date: Tue, 15 Oct 2002 13:55:41 +0200 Sender: netfilter-admin@lists.netfilter.org Message-ID: <00d701c27441$c9578e90$0100a8c0@obsidian> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Errors-To: netfilter-admin@lists.netfilter.org List-Help: List-Post: List-Subscribe: , List-Id: List-Unsubscribe: , List-Archive: Content-Type: text/plain; charset="us-ascii" To: netfilter@lists.netfilter.org Hello, I have a kernel 2.4.19 machine running netfilter (1.2.7a) and performing NAT for my internal network. The machine has two internet connections, one ADSL and one via a cable provider. I select the provider by changing the default gateway at the netfilter machine. The strange thing I noticed: when I am using cable as the default gateway, my firewall ruleset shows the multicast query the provider's router is sending me on a regular base. But when I change the default gateway to direct all outgoing traffic via the ADSL link, there are no more log entries showing the multicast query over the cable modem. Although when I dump the packets on the cable interface, I do see the Multicast queries. The firewall ruleset stays the same. I compared the loaded version, only different in packet counters. I suspect one of the kernel parameters (/proc/sys/net/...) influences this behaviour. But I don't know which one. Or is this behaviour netfilter specific? Do the packets which netfilter doesn't see get further into my machine? Or are they dropped by the kernel? Thanks, Jan