AW: AW: bandwidth problems [Linux 2.4.20] [iptables 1.2.7a]

[<root@scheuchenstuel.com>]

> > > > Hi!
> > > >  
> > > > My configuration:
> > > > =================
> > > > 
> > > > O-------------o    O-----------------------o
> > > > |    WinXP    |    |    eth0     |   eth1  |
> > > > | 10.10.1.100 |----| 10.10.1.254 | D H C P |----INTERNET
> > > > |             |    |             |         |
> > > > O-------------o    O-----------------------o
> > > >   My Computer           My NAT-Computer
> > > > 
> > > > NAT-Computer:
> > > >   Linux 2.4.20-4GB
> > > >   load average: 0.08, 0.05, 0.06
> > > >   iptables v1.2.7a
> > > > All the NICs I use are 3com 3C905-TX
> > > > 
> > > > When I do some bandwidth tests on the NAT-Computer
> > > (provider's service
> > > > page) my bandwidth is about 1MBit/second When I do the 
> same on my 
> > > > computer I only get about 100kbit/second
> > > > 
> > > > Now I wonder if there are any problems with my configuration...?
> > > > Would be nice if you could help me...
> > > > 
> > > > Thanks in advance
> > > > Florian St.
> > > > 
> > > > Root(AT)scheuchenstuel(DOT)com
> > > > 
> > > > 
> > > > My iptables-configuration:
> > > > ==========================
> > > > 
> > > > 
> > > 
> ####################################################################
> > > ##
> > > > ######
> > > > ######
> > > > 
> > > > #!/bin/bash
> > > > #
> > > > 
> > > > modprobe iptable_nat
> > > > echo 1 > /proc/sys/net/ipv4/ip_forward
> > > > 
> > > > ########## CLEARING TABLES
> > > > iptables -F
> > > > iptables -t nat -F
> > > > iptables -t mangle -F
> > > > iptables -X
> > > > 
> > > > ########## SETTING POLICIES
> > > > iptables -P INPUT DROP
> > > > iptables -P OUTPUT ACCEPT
> > > > iptables -P FORWARD DROP
> > > > 
> > > > ########## NAT
> > > > iptables -A INPUT -i eth1 -m state --state 
> ESTABLISHED,RELATED -j 
> > > > ACCEPT iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
> > > > 
> > > > ########## LOOPBACK SETTINGS
> > > > iptables -A INPUT -i lo -j ACCEPT
> > > > iptables -A INPUT -s 127.0.0.1/32 -j ACCEPT
> > > > 
> > > > ########## EXTERNAL OPEN PORTS
> > > > iptables -A INPUT -i eth1 -p tcp --dport 80 -j ACCEPT
> > > > 
> > > > ########## INTERNAL OPEN PORTS
> > > > iptables -A INPUT -s 10.10.1.100/32 -j ACCEPT
> > > > 
> > > > ######### NAT FORWARDING
> > > > iptables -A FORWARD -s 10.10.1.100/32 -j ACCEPT iptables -A
> > > FORWARD -d
> > > > 10.10.1.100/32 -j ACCEPT
> > > > 
> > > > 
> > > 
> ####################################################################
> > > ##
> > > > ######
> > > > ######
> > > 
> > > The rules look a little unusual; in fact, they look downright 
> > > dangerous.  You may want to read a good iptables tutorial such as 
> > > the one by Oskar Andreasson.  You can find a link to it on the 
> > > netfilter.org web site.  You can also find some slide 
> shows in the 
> > > training section at http://iscs.sourceforge.net
> > > 
> > > However, I do not think your rules would create a 
> throughput problem. 
> > > How are you measuring your throughput?
> > > --
> > > John A. Sullivan III
> > > Chief Technology Officer
> > > Nexus Management
> > > +1 207-985-7880
> > > john.sullivan@nexusmgmt.com
> > > ---
> > 
> > Now i tried to use a script suggested by Oskar Andreasson 
> > 
> http://iptables-tutorial.frozentux.net/iptables-tutorial.html#RCFIREWA
> > LLTXT
> > 
> > But the problem is still the same...
> > I think there is another problem...
> > 
> > When i configure&start squid on the NAT-Computer i have 
> full bandwidth...
> > 
> > I don't know what to do anymore...
> > 
> > Thanks in advance
> > Florian St.
> How are you measuring your throughput? What happens if you 
> don't use squid but allow direct (iptables protected) web 
> access from the client?
> --
> John A. Sullivan III
> Chief Technology Officer
> Nexus Management
> +1 207-985-7880
> john.sullivan@nexusmgmt.com
> ---

I use the bandwidth test-page of my provider...
http://performance.chello.at:81

What do you mean with "direct" web access ?
Web access via NAT ?
I have entered the NAT-computer's IP as default gateway
and the provider's DNS-servers as DNS-servers on my PC.
I think this is what you mean with direct access...

With this direct access i only get about 100kbit, when i use
squid or when i do the tests on the NAT-computer i have full
Bandwidth (around 1MBit/sec)

I think there is a general problem with my configuration,
because the bandwidth is no better with iptables-scripts
which are known to work fine...

I really don't know what to do anymore...

Thanks in advance
Florian St.