CentOS 6 - networking problem

[satimis]

Hi all,

Host - Ubuntu 12.04 64bit
VM - CentOS6
Virtualizer - VirtualBox

On reboot device br0 does not seem to be present. I must run;
# /usr/sbin/brctl addbr br0
# /usr/sbin/brctl setfd br0 0
# /usr/sbin/brctl sethello br0 0
# /usr/sbin/brctl addif br0 eth0
# service network restart

# brctl show

bridge name     bridge id               STP enabled     interfaces
br0             8000.0800277eccb9       no              eth0

Then it works

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

DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
NETMASK=255.255.255.0
#IPADDR=192.168.124.10
GATEWAY=192.168.124.1
TYPE=Ethernet

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

DEVICE=br0
BOOTPROTO=none
#HWADDR=00:1c:c0:61:d8:b2
ONBOOT=yes
IPADDR=192.168.0.214
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
TYPE=bridge
USERCTL=no
IPV6INIT=no
PEERDNS=yes

Please help. TIA

B.R.
satimis

[scathefire]

You could always just script it:

#!/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 "$cmd" in
  start)
    brctl addbr br0;
#    brctl stp br0 on; # No STP
    brctl addif br0 eth0;
    brctl addif br0 eth1;
    (ifdown eth0 1>/dev/null 2>&1;);
    (ifdown eth1 1>/dev/null 2>&1;);
    ifconfig eth0 0.0.0.0 up;
    ifconfig eth1 0.0.0.0 up;
    ifconfig br0 192.168.0.x up ### Adapt to your needs.
    route add default gw 192.168.0.x; ### Adapt to your needs.
#    i removed the br0 from the for statement
    for file in eth0 eth1;
    do
      echo "1" > /proc/sys/net/ipv4/conf/${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 eth0;
    brctl delif br0 eth1;
    ifconfig br0 down;
    brctl delbr br0;
    ifdown eth0; ### Adapt to your needs.
    ifdown eth1; ### Adapt to your needs.
    ;;
  restart,reload)
    $0 stop;
    sleep 3;
    $0 start;
    ;;
esac;

[satimis]

You could always just script it:

#!/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 "$cmd" in
  start)
    brctl addbr br0;
#    brctl stp br0 on; # No STP
    brctl addif br0 eth0;
    brctl addif br0 eth1;
    (ifdown eth0 1>/dev/null 2>&1;);
    (ifdown eth1 1>/dev/null 2>&1;);
    ifconfig eth0 0.0.0.0 up;
    ifconfig eth1 0.0.0.0 up;
    ifconfig br0 192.168.0.x up ### Adapt to your needs.
    route add default gw 192.168.0.x; ### Adapt to your needs.
#    i removed the br0 from the for statement
    for file in eth0 eth1;
    do
      echo "1" > /proc/sys/net/ipv4/conf/${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 eth0;
    brctl delif br0 eth1;
    ifconfig br0 down;
    brctl delbr br0;
    ifdown eth0; ### Adapt to your needs.
    ifdown eth1; ### Adapt to your needs.
    ;;
  restart,reload)
    $0 stop;
    sleep 3;
    $0 start;
    ;;
esac;

Thanks for your script.

Where shall I put the script?

I have no idea which file will be evoked by CentOS at boot finally. Actually I can put following commands on that file;

# /usr/sbin/brctl addbr br0
# /usr/sbin/brctl setfd br0 0
# /usr/sbin/brctl sethello br0 0
# /usr/sbin/brctl addif br0 eth0

Then network will be connected at boot automatically.

B.R.
satims

[scathefire]

Then just take those commands, put them in a script. Make sure its executable (chmod +x filename - or something to that effect).

Or you don't want to script, drop them directly into rc.local

If you decide to script, then modify /etc/rc.local, which is like the last thing ran in the boot sequence, a line that might look like:

/home/someuser/directory/scriptname

[satimis]

Then just take those commands, put them in a script. Make sure its executable (chmod +x filename - or something to that effect).

Or you don't want to script, drop them directly into rc.local

If you decide to script, then modify /etc/rc.local, which is like the last thing ran in the boot sequence, a line that might look like:

/home/someuser/directory/scriptname

I hope I understand your advice correctly.

copy your script on /home/user/directory/scriptname.sh

$ sudo chmod +x /home/user/directory/scriptname.sh

On /path/to/rc.local
entering

/home/user/directory/scriptname.sh

If wrong, please correct me. TIA

satimis

[scathefire]

Basically that's about it. You may want to put an exit code at the end of the script. Sometimes they can hang if its not there. So in your case your script might look like:

/usr/sbin/brctl addbr br0
/usr/sbin/brctl setfd br0 0
/usr/sbin/brctl sethello br0 0
/usr/sbin/brctl addif br0 eth0
exit 0

[satimis]

Basically that's about it. You may want to put an exit code at the end of the script. Sometimes they can hang if its not there. So in your case your script might look like:

/usr/sbin/brctl addbr br0
/usr/sbin/brctl setfd br0 0
/usr/sbin/brctl sethello br0 0
/usr/sbin/brctl addif br0 eth0
exit 0

Your advice works here. Thanks

B.R.
satimis

[krielallmighty]

Your advice works here. Thanks

B.R.
satimis

I have the same problem.....

But is your problem not in the capitalization of the variable "bridge"??

TYPE=Bridge

[satimis]

I have the same problem.....

But is your problem not in the capitalization of the variable "bridge"??

TYPE=Bridge

Sorry, this is an old thread. The CentOS 6 VM has been wiped out already.

satimis