On Tue, Jun 03, 2003 at 09:39:50PM +0200, SLeiBt wrote: > Hi, > > Le mar 03/06/2003 ? 14:15, [EMAIL PROTECTED] a ?crit : > > Hi. > > > > I have setup a firewall (I am just doing masquerading now) between the a > > cable modem and the local network. Cable modem is connected to eth1 and the > > eth0 connects to the local switch. When both interfaces are up, The > > connecting beween the firewall and a local system is too slow. As soon as I > > bring eth1 down > > > > # ifdown eth1 > > > > the connection speed improves dramatically in the local network. > > > > The two network cards are RTL 8139. The kernel version is 2.4.19-586tsc. I > > am using Debian GNU/Linux testing. > > > > I tried changing both network cards but no change in speed. I also removed > > the masquerading rule still the same problem. > > Could that be dns related? Maybe putting private addresses in your > /etc/hosts will help things... >
Yes it is. I ran tcpdump on eth1 and found out that the firewall was trying to do a reverse look of the local IPs. I was given three nameservers by the DHCP server at ISP but the firewall couldn't access any one of those thus resulting in the delay. I removed all nameserver entries in /etc/resolv.conf and put the following line in /etc/dhclient.conf supersede domain-name-servers 127.0.0.1; and renewed the IP of eth1. Everything is fine now. Thank you all for the replies. Avinash. -- ------------------------------------ Avinash S http://www.geocities.com/ssavinash ------------------------------------
