Category: Linux

UPDATED for CentOS 7:

CentOS 7 multiple VLANs on one interface

The scenario I had was 1 eth0 device, and my port trunk’d to allow 9 and 10 vlans. I wanted to assign the full /24 to this box, using only eth0 and the trunk port in CentOS 6. This is what I had to do.

in linux NEED eth0 and one VLAN’d CFG:

cd /etc/sysconfig/network-scripts/

ifcfg-eth0.9 the .9 is the vlan

# Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express
DEVICE=eth0.9
BOOTPROTO=none
HWADDR=00:1d:xx:xx:xx:xx
ONBOOT=yes
TYPE=Ethernet
IPADDR=173.243.116.2
NETMASK=255.255.255.0
VLAN=yes

ifcfg-eth0.10

# Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express
DEVICE=eth0.10
BOOTPROTO=none
HWADDR=00:1d:xx:xx:xx:xx
ONBOOT=yes
TYPE=Ethernet
IPADDR=173.243.117.2
NETMASK=255.255.255.0
VLAN=yes

ifcfg-eth0
# Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:1d:xx:xx:xx:xx
ONBOOT=yes
TYPE=Ethernet

ifcfg-eth0.9-range0
IPADDR_START=173.243.116.3
IPADDR_END=173.243.116.254
NETMASK=255.255.255.0
CLONENUM_START=3

ifcfg-eth0.11-range0
IPADDR_START=199.96.80.3
IPADDR_END=199.96.80.254
NETMASK=255.255.255.0
CLONENUM_START=257

******************************************************************************************

CENTOS 6 REQUIRES NO GATEWAY in ifcfg-eth0.xx so remove it

CENTOS 6 REQUIRES ROUTES ADDED:

You can do this to test, as once the server is rebooted, or network restarted these rules drop:
ip route add default via 192.119.164.1 dev eth0.8 table 1
ip route add default via 192.119.165.1 dev eth0.9 table 2
ip rule add from 192.119.164.2 tab 1 priority 500
ip rule add from 192.119.165.2 tab 2 priority 501
ip rule add from 192.119.164.0/24 table 1
ip rule add from 192.119.165.0/24 table 2

To make it permanent:
cd /etc/sysconfig/network-scripts/

echo ‘default via 192.119.169.1 dev eth0.3 table 1’ > route-eth0.3
echo ‘default via 192.119.174.1 dev eth0.6 table 2’ > route-eth0.6
echo ‘from 192.119.169.2 tab 1 priority 500’ > rule-eth0.3
echo ‘from 192.119.174.2 tab 2 priority 501’ > rule-eth0.6
echo ‘from 192.119.169.0/24 table 1’ > rule-eth0.3
echo ‘from 192.119.174.0/24 table 2’ > rule-eth0.6

******************************************************************************************

I always find it easier when my history has a time stamp, you can coorolate a lot of things, like last, start/stops of services, who done it, etc.

export HISTTIMEFORMAT=”%F %T ”

This will work for the session, but if you want it saved for every log in add to respective bash_profile:
~/.bash_profile or /root/.bash_profile

I kept getting: Firewall Status: Enabled but Stopped in my CSF in cPanel. I am currently running WHM 11.40.1 (build 11) and csf v7.03.

I tried just clicking start, no luck it would just flip back a few minutes later. So I ended up dropping to shell and running

service csf stop
iptables –flush
service csf start

that seemed to work, there must have been a hung iptables rule, or a bad rule that caused CSF to flip to disabled.

What I did to disable it was go to: /etc/sysconfig/rhn

and delete all of the files in it. If you want to re-enabled it after, you can just copy the files back, so you may want to copy them to a location you want to keep them at.

wget -O - -q icanhazip.com

you will get a very easy looking readout

example:

root@madhost419 [~]# wget -O - -q icanhazip.com
74.122.196.130
root@madhost419 [~]#

or via curl:

curl http://www.cPanel.net/showip.cgi

Using the squirrel app: http://www.squirrelsql.org/ I had issues with only seeing 100 rows in a table. I fixed this by going to File -> New Sessions Properties -> Object Tree -> Contents -> limit rows. The default is 100, but you can uncheck it and you should be good.

If not, you can also do the same under New Sessions Properties -> SQL -> SQL Results – limit rows. Then uncheck it and hit OK.

That worked for me!