Re: manually configuring bridging on FC4

From: Paul Howarth (paul_at_city-fan.org)
Date: 08/06/05

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Sat, 06 Aug 2005 18:53:48 +0100

    On Sat, 2005-08-06 at 12:04 -0400, Jack Howarth wrote:
    > I have a wireless card currently configured such that I can enable its
    > interface from the Network Configurator. The card is currently set up
    > to do dhcp as is an inactive ethernet card in the same box. I have been
    > trying to get bridging to work such that the ethernet can provide network
    > access for a xbox. Trying the following script...
    >
    > #!/bin/bash
    > PATH="/sbin:/usr/sbin:/usr/local/sbin";
    > slaveIfs="1 2 3 4 6 7 8 9 10";
    > cmd="$1";
    > [ -z "$cmd" ] && cmd="start";
    > case "$cmd" in
    > start)
    > brctl addbr br0;
    > brctl stp br0 on;
    > brctl addif br0 wlan0;
    > brctl addif br0 eth0;
    > (ifdown wlan0 1>/dev/null 2>&1;);
    > (ifdown eth0 1>/dev/null 2>&1;);
    > ifconfig wlan0 0.0.0.0 up;
    > ifconfig eth0 0.0.0.0 up;
    > ifconfig br0 192.168.1.126 broadcast 192.168.1.255 netmask 255.255.255.0 up
    > ### Adapt to your needs.
    > route add default gw 192.168.1.1; ### Adapt to your needs.
    > for file in br0 wlan0 eth0;
    > do
    > echo "1" > /proc/sys/net/ipv4/conf/${file}/proxy_arp;
    > echo "1" > /proc/sys/net/ipv4/conf/${file}/forwarding;
    > done;
    > echo "1" > /proc/sys/net/ipv4/ip_forward;
    > ;;
    > stop)
    > brctl delif br0 wlan0;
    > brctl delif br0 eth0;
    > ifconfig br0 down;
    > brctl delbr br0;
    > #ifup eth0; ### Adapt to your needs.
    > #ifup eth1; ### Adapt to your needs.
    > ;;
    > restart,reload)
    > $0 stop;
    > sleep 3;
    > $0 start;
    > ;;
    > esac;
    >
    > I am able to create the bridge but in the process the Network Configurator
    > shows my wlan0 interface becomes disabled and doesn't come back up
    > automatically. If I enable the interface in the Network Configurator, I
    > find that I am not able to reach the external internet through the
    > wireless card anymore unless I stop the bridge and reactive the wlan0
    > again. The ip addresses above are the ip address dhcp had assigned
    > (192.168.1.126) to the wireless card and the ip address of the wireless
    > router (192.168.1.1).

    A bridge is intended to transparently join two networks together. So if
    you have interfaces A & B and bridge them together, interfaces A & B
    should disappear (not have an IP address) and you should end up with an
    address for just the bridge interface. That's my recollection of how
    bridges work anyway.

    Paul. 

    -- 
Paul Howarth <paul@city-fan.org>
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