Re: [SLUG] Bridging/network on PearPC

O Plameras Thu, 12 May 2005 19:35:55 -0700


Hi Phil,

1.  In my linux-bridge at home, my routing table is as follows:

[EMAIL PROTECTED] route Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 * 255.255.255.0 U 0 0 0 br0 default 192.168.1.100 0.0.0.0 UG 0 0 0 br0

I activate the above route manually.

Ideally, there should be no routing table on the linux-bridge to do its
bridging tasks.  There is no need.

The reason why I have one is because I want to connect to other
networks whilst working on this linux-bridge.  But once I complete
my work I disable the routing table for security reasons.  But that
means I can only login from the console.

However, if there is a requirement for anyone to connect from a
remote machine then the route table has to be configured automatically
on boot.

Of course, this is done thru /etc/sysconfig/network-scripts/ifcfg-br0, etc.

2.  My bridge shows:

[EMAIL PROTECTED] ~]# brctl show bridge name bridge id STP enabled interfaces br0 8000.001060a7dd45 yes bnep0 bnep1 eth0 eth1 eth2

3. My bridge interface config:

/etc/sysconfig/network-scripts/ifcfg-br0

DEVICE=br0
BOOTPROTO=static
IPADDR=192.168.1.10 (optionally IPADDR=0.0.0.0)
NETMASK=255.255.255.0
ONBOOT=yes
TYPE=Ethernet

4.  A sample interface config, i.e. eth0:

/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
BOOTPROTO=static
BRIDGE=br0
IPADDR=0.0.0.0
NETMASK=255.0.0.0
ONBOOT=yes
TYPE=Ethernet
HWADDR=00:50:8B:FE:B3:D9

5.  Other interfaces config:
/etc/sysconfig/network-scripts/ifcfg-eth1 (second ether)
/etc/sysconfig/network-scripts/ifcfg-eth2 (third ether)
/etc/sysconfig/network-scripts/ifcfg-bnep0 (first wireless bluez)
/etc/sysconfig/network-scripts/ifcfg-bnep1 (second wireless bluez)

Optionally, I can have a number of  additional interfaces here,
e.g. 802.11s.

6.  By configuring interfaces as above, one automates the bridging and
activation of the interfaces. There is no need to do the procedure
that you do manually. This will be done by the '/etc/init.d/network'
script. I am using FedoraCore 3. I have used the same methods for
FedoraCore 2.

7.  My interfaces are as follows:
[EMAIL PROTECTED] ~]# ifconfig -a | more
bnep0     Link encap:Ethernet  HWaddr 00:10:60:A7:DD:45
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:8 errors:0 dropped:0 overruns:0 frame:0
         TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:428 (428.0 b)  TX bytes:830 (830.0 b)

bnep1     Link encap:Ethernet  HWaddr 00:10:60:A7:DD:45
         BROADCAST MULTICAST  MTU:1500  Metric:1
         RX packets:163 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:6271 (6.1 KiB)  TX bytes:0 (0.0 b)

br0       Link encap:Ethernet  HWaddr 00:10:60:A7:DD:45
         inet addr:192.168.1.10  Bcast:192.168.1.255  Mask:255.255.255.0
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:89946 errors:0 dropped:0 overruns:0 frame:0
         TX packets:43049 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:31360667 (29.9 MiB)  TX bytes:4987737 (4.7 MiB)

eth0      Link encap:Ethernet  HWaddr 00:50:8B:FE:B3:D9
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:399911 errors:0 dropped:0 overruns:0 frame:0
         TX packets:427279 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:332791445 (317.3 MiB)  TX bytes:65780888 (62.7 MiB)

eth1      Link encap:Ethernet  HWaddr 00:A0:CC:51:67:7D
         UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
         RX packets:326444 errors:1 dropped:0 overruns:0 frame:0
         TX packets:443250 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:54448251 (51.9 MiB)  TX bytes:277625591 (264.7 MiB)
         Interrupt:11 Base address:0xa000

eth2      Link encap:Ethernet  HWaddr 00:10:5A:67:F2:A1
         BROADCAST MULTICAST  MTU:1500  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:1000
         RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
         Interrupt:5 Base address:0x1400

lo        Link encap:Local Loopback
         LOOPBACK  MTU:16436  Metric:1
         RX packets:0 errors:0 dropped:0 overruns:0 frame:0
         TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
         collisions:0 txqueuelen:0
         RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

I hope this info is useful.

O Plameras


Phil Scarratt wrote:

Peter Rundle wrote:
 brctl addbr br0
 brctl stp br0 off
 brctl addif br0 eth0
 brctl addif br0 eth1
 ifconfig eth0 down
 ifconfig eth1 down
 ifconfig eth0 0.0.0.0 up
 ifconfig eth1 0.0.0.0 up
 echo 1 >/proc/sys/net/ipv4/ip_forward
 ifconfig br0 192.168.0.254 up
I've just setup bridging for a VPN using the same process as above and have found that if I put the steps in a script (FC1) it doesn't work. IE you get a situation like the following (I've removed the Metric and Ref columns for wrapping purposes):
Main routing table directly after running script:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Iface
192.168.100.0   *               255.255.255.0   U     br0
192.168.100.0   *               255.255.255.0   U     eth1
10.0.0.0        *               255.0.0.0       U     eth0
127.0.0.0       *               255.0.0.0       U     lo
default         10.1.1.3        0.0.0.0         UG    eth0
Main routing table 10 or so seconds later:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Iface
192.168.100.0   *               255.255.255.0   U     eth1
192.168.100.0   *               255.255.255.0   U     eth1
10.0.0.0        *               255.0.0.0       U     eth0
127.0.0.0       *               255.0.0.0       U     lo
default         10.1.1.3        0.0.0.0         UG    eth0
Which then of course screws it all right up and doesn't work. I have absolutely no idea why - still looking. If I type out the individual commands in the script by hand it works fine, and I end up with:
Destination     Gateway         Genmask         Flags Iface
192.168.100.0   *               255.255.255.0   U     br0
10.0.0.0        *               255.0.0.0       U     eth0
127.0.0.0       *               255.0.0.0       U     lo
default         10.1.1.3        0.0.0.0         UG    eth0
I've even tried putting a sleep 2 (5 and 10 as well) between the last two lines (ie bringing eth1 up with 0.0.0.0 promisc and bringing br0 up) and it doesn't help I get:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Iface
192.168.100.0   *               255.255.255.0   U     eth1
192.168.100.0   *               255.255.255.0   U     br0
10.0.0.0        *               255.0.0.0       U     eth0
127.0.0.0       *               255.0.0.0       U     lo
default         10.1.1.3        0.0.0.0         UG    eth0
And it still doesn't work. No idea but it only just happened last thing yesterday so still looking around for a cause/fix. I know this doesn't really deal with the original problem, but couldn't help commenting.

Fil

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Re: [SLUG] Bridging/network on PearPC

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