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Fog_Watch
Apprentice
Joined: 24 Jul 2006
Posts: 267
Location: Utility Muffin Research Kitchen
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 Posted: Wed Feb 13, 2013 5:44 am Post subject: Why is eth0 in my routing table as well as bridge br0? |
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I would like to bridge eth0 and wlan0. /etc/conf.d/net is as follows:
| Code: | modules_wlan0="!wpa_supplicant"
config_wlan0="null"
config_eth0="null"
bridge_br0="eth0"
config_br0="dhcp"
brctl_br0="setfd 0
sethello 10
stp off" |
This is works OK, however I can't ping out of my machine.
The routing table is as follows:
| Code: | Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.1.1 0.0.0.0 UG 204 0 0 br0
loopback localhost 255.0.0.0 UG 0 0 0 lo
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 204 0 0 br0
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That is, destination "192.168.1.0" is listed twice, once under eth0 and
once under br0. I don't know why eth0 should be there, and when
removed routing works fine, both into and from the box. When the
machine is booting and net.br0 starts under runlevel default, how do I prevent
the eth0 route from being created?
Regards
Fog_Watch.
(Don't worry about the absence of wlan0, I know how to fix that) |
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Logicien
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Joined: 16 Sep 2005
Posts: 1555
Location: Montréal
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| Posted: Wed Feb 13, 2013 5:54 am Post subject: |
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Do you have net.eth0 in /etc/init.d? What is the output of
after boot is finish?
_________________
Paul |
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Fog_Watch
Apprentice
Joined: 24 Jul 2006
Posts: 267
Location: Utility Muffin Research Kitchen
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| Posted: Wed Feb 13, 2013 6:26 am Post subject: |
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| Logicien wrote: | Do you have net.eth0 in /etc/init.d? What is the output of
after boot is finish? |
| Code: | # ls -la /etc/init.d/net*
lrwxrwxrwx 1 root root 6 Feb 11 19:08 /etc/init.d/net.br0 -> net.lo
lrwxrwxrwx 1 root root 6 Feb 11 19:08 /etc/init.d/net.eth0 -> net.lo
-rwxr-xr-x 1 root root 16919 Feb 1 23:06 /etc/init.d/net.lo
lrwxrwxrwx 1 root root 6 Feb 11 19:08 /etc/init.d/net.wlan0 -> net.lo
-rwxr-xr-x 1 root root 1578 Feb 1 23:06 /etc/init.d/netmount
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With or without net.eth0 in /etc/init.d the confounding eth0 route still appears. However, hostapd needs both net.eth0 and net.br0 in /etc/init.d.
| Code: |
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.001676d0bfe6 no eth0 |
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cwr
Veteran
Joined: 17 Dec 2005
Posts: 1969
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| Posted: Wed Feb 13, 2013 1:27 pm Post subject: |
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Have you set up hostapd.conf to tell hostapd that it's using a bridge?
Will |
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Logicien
Veteran
Joined: 16 Sep 2005
Posts: 1555
Location: Montréal
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| Posted: Wed Feb 13, 2013 2:58 pm Post subject: |
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If you want wlan0 to be in the same bridge than eth0, you have to add it in the bridge br0. Both are dependancies of br0 and have to be started by net.br0. They should not be started independently.
_________________
Paul |
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Fog_Watch
Apprentice
Joined: 24 Jul 2006
Posts: 267
Location: Utility Muffin Research Kitchen
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| Posted: Thu Feb 14, 2013 2:07 am Post subject: |
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I don't believe that wlan0 or hostapd to be the problem:
I can plop wlan0 into my bridge easy peasy:
| Code: | # brctl show
bridge name bridge id STP enabled interfaces
br0 8000.001676d0bfe6 no eth0
wlan0 |
Having started hostapd I can then use the wifi access point.
My problem is the routing table that is established by booting. The following is what is currently booted:
| Code: | # rc-update show | grep net
net.br0 | default
net.lo | boot
netmount | default |
| Code: | # ls -la /etc/init.d/net*
lrwxrwxrwx 1 root root 6 Feb 13 19:19 /etc/init.d/net.br0 -> net.lo
-rwxr-xr-x 1 root root 16919 Feb 1 23:06 /etc/init.d/net.lo
-rwxr-xr-x 1 root root 1578 Feb 1 23:06 /etc/init.d/netmount
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| Code: | # egrep -v '^#|^$' /etc/conf.d/net
modules_wlan0="!wpa_supplicant"
config_wlan0="null"
brctl_br0="setfd 0
sethello 10
stp off"
config_eth0="null"
bridge_br0="eth0"
config_br0="dhcp"
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And the following is the infernal routing table that boot comes up with, unless I route del eth0.
| Code: | route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
default 192.168.1.1 0.0.0.0 UG 4 0 0 br0
loopback localhost 255.0.0.0 UG 0 0 0 lo
192.168.1.0 * 255.255.255.0 U 0 0 0 eth0
192.168.1.0 * 255.255.255.0 U 4 0 0 br0
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Ah.
Why is eth0 in my routing table as well as bridge br0?
Moreover, thank you Paul and Will. |
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Aiken
Apprentice
Joined: 22 Jan 2003
Posts: 239
Location: Toowoomba/Australia
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| Posted: Thu Feb 14, 2013 2:56 am Post subject: |
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I am using a bridge consisting of eth0 + eth1 + wlan0 with hostapd and not seeing either of the eth devices in the routing table.
| Code: |
config_eth0="null"
config_eth1="null"
bridge_br0="eth0 eth1"
config_br0="172.16.31.1/24"
routes_br0="default via 172.16.31.254"
depend_br0() {
need net.eth0 net.eth1
}
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| Code: |
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 172.16.31.254 0.0.0.0 UG 6 0 0 br0
127.0.0.0 127.0.0.1 255.0.0.0 UG 0 0 0 lo
172.16.31.0 0.0.0.0 255.255.255.0 U 0 0 0 br0
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| Code: |
net.br0 | default
net.eth0 | default
net.eth1 | default
net.lo | boot
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One difference I am seeing is I have net.eth0 and net.eth1 in default where you do not have your net.eth0 in default. Don't see what that should make a difference as the eth device(s) should be started anyway as dependencies of br0. The other difference is I am using static and you are using dhcp. At the moment I am wondering if you have something else adding a route via eth0. Could that something else be the dhcp client?
| Logicien wrote: | If you want wlan0 to be in the same bridge than eth0, you have to add it in the bridge br0. Both are dependancies of
br0 and have to be started by net.br0. They should not be started independently. |
Hostapd adds wlan0 to the bridge as needed. Wlan0 does not need to be part of the original bridge definition. The bridge can be started independently of wlan0. In this situation hostapd needs the bridge started 1st.
_________________
Beware the grue. |
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Fog_Watch
Apprentice
Joined: 24 Jul 2006
Posts: 267
Location: Utility Muffin Research Kitchen
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| Posted: Thu Feb 14, 2013 4:38 am Post subject: |
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| Aiken wrote: | | The other difference is I am using static and you are using dhcp. |
dhcp or not, my routing table ends up the same: borked. |
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