Re: Too slow connection
On Tue, Jun 03, 2003 at 09:39:50PM +0200, SLeiBt wrote:
> Hi,
>
> Le mar 03/06/2003 ? 14:15, avinashss@vsnl.net 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.
--
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Avinash S
http://www.geocities.com/ssavinash
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