CentOS - Oct 2005 - iproute create policy routes after reboot

Which files do I need to edit in order to initialize a route after a 
reboot.

I have a 802.1q tagged VLAN interface which I need to create a rule, and a 
route for.

I see on my CentOs 4.2 box that in /etc/iproute2 there are the following 
files. I realize that I can add my tables to /etc/iproute2/rt_tables, but 
when I want to create a rule I am not sure where to put the information 
for the next reboot.

[root at smtcormx01 ~ ]# ls -la /etc/iproute2/
total 104
drwxr-xr-x   2 root root  4096 Oct 28 13:44 .
drwxr-xr-x  87 root root 12288 Oct 28 21:47 ..
-rw-r--r--   1 root root   299 Feb 21  2005 rt_dsfield
-rw-r--r--   1 root root   286 Feb 21  2005 rt_dsfield.rt_config
-rw-r--r--   1 root root   296 Feb 21  2005 rt_protos
-rw-r--r--   1 root root   276 Feb 21  2005 rt_protos.rt_config
-rw-r--r--   1 root root   113 Feb 21  2005 rt_realms
-rw-r--r--   1 root root   112 Feb 21  2005 rt_realms.rt_config
-rw-r--r--   1 root root    98 Feb 21  2005 rt_scopes
-rw-r--r--   1 root root    92 Feb 21  2005 rt_scopes.rt_config
-rw-r--r--   1 root root    91 Feb 21  2005 rt_tables
-rw-r--r--   1 root root    87 Feb 21  2005 rt_tables.rt_config

On Fri, 2005-10-28 at 22:39 -0400, Robin Mordasiewicz
wrote:
> Which files do I need to edit in order to initialize a route after a 
> reboot.
> 
> I have a 802.1q tagged VLAN interface which I need to create a rule, and a 
> route for.
> 
> I see on my CentOs 4.2 box that in /etc/iproute2 there are the following 
> files. I realize that I can add my tables to /etc/iproute2/rt_tables, but 
> when I want to create a rule I am not sure where to put the information 
> for the next reboot.
> 
> [root at smtcormx01 ~ ]# ls -la /etc/iproute2/
> total 104
> drwxr-xr-x   2 root root  4096 Oct 28 13:44 .
> drwxr-xr-x  87 root root 12288 Oct 28 21:47 ..
> -rw-r--r--   1 root root   299 Feb 21  2005 rt_dsfield
> -rw-r--r--   1 root root   286 Feb 21  2005 rt_dsfield.rt_config
> -rw-r--r--   1 root root   296 Feb 21  2005 rt_protos
> -rw-r--r--   1 root root   276 Feb 21  2005 rt_protos.rt_config
> -rw-r--r--   1 root root   113 Feb 21  2005 rt_realms
> -rw-r--r--   1 root root   112 Feb 21  2005 rt_realms.rt_config
> -rw-r--r--   1 root root    98 Feb 21  2005 rt_scopes
> -rw-r--r--   1 root root    92 Feb 21  2005 rt_scopes.rt_config
> -rw-r--r--   1 root root    91 Feb 21  2005 rt_tables
> -rw-r--r--   1 root root    87 Feb 21  2005 rt_tables.rt_config
> 
> _______________________________________________
Interesting, I didn't think their was something stock for this, I always
spun my own sctipt for QOS policies when I was using htb qdisc a while
back.


Ted

On Fri, 28 Oct 2005, Robin Mordasiewicz wrote:
> Which files do I need to edit in order to initialize a route after a
reboot.
>
> I have a 802.1q tagged VLAN interface which I need to create a rule, and a 
> route for.
>
> I see on my CentOs 4.2 box that in /etc/iproute2 there are the following 
> files. I realize that I can add my tables to /etc/iproute2/rt_tables, but 
> when I want to create a rule I am not sure where to put the information for
> the next reboot.
>
I wrote the following /sbin/ifup-local script. Mebbe someone has something 
to say...

<snip /sbin/ifup-local>
#!/bin/bash
#
# Robin Mordasiewicz <robin at bullseye.tv>
# The following script is copied and pasted together from the existing
# network startup scripts found on RedHat-AS/CentOS

# This custom script is run last. This is called by the ifup-post script
# on a RedHat/CentOS based system.
#
# This script will add a routing table and a rule for each VLAN interface
# so that when responding to traffic from a box with multiple tagged VLAN
# interfaces the proper VLAN tags are added.

# The problem is that Linux repsonds to traffic based on the routing
# table, which means that packets which are sent out the device which the
# default gateway is configured will be tagged with the wrong VLAN

# The only devices that this script should act on are tagged VLAN
# interfaces Tagged VLAN interfaces will be in the form bond0.xxx, or
# eth0.xxx. Other regular devices such as lo, eth0, or bond0 should not
# require this script to run

# This requires that you have a "GATEWAY=x.x.x.x",
"TABLE=???", and
# optionally a "PRIORITY=xx" configured in the interface config,
# ie. /etc/sysconfig/network-scripts/ifcfg-bondx.xxx,
# or /etc/sysconfig/network-scripts/ifcfg-ethx.xxx

# It is also required that your tables are properly listed in
# /etc/iproute2/rt_tables

# For more information read the following websites.
# http://www.linuxjournal.com/article/7291
# http://lartc.org/howto/lartc.rpdb.html
if echo ${1} | LANG=C egrep -v '(:)' | LANG=C egrep -q \
           '(eth|bond)[0-9][0-9]*\.[0-9][0-9]?[0-9]?[0-9]?'; then
     . /etc/init.d/functions

     cd /etc/sysconfig/network-scripts
     . network-functions

     [ -f ../network ] && . ../network

     CONFIG=${1}

     [ -z "${CONFIG}" ] && {
         echo $"Usage: ifup <device name>" >&2
         exit 1
     }

     need_config ${CONFIG}

     [ -f "${CONFIG}" ] || {
         echo $"$0: configuration for ${1} not found." >&2
         echo $"Usage: ifup-local <device name>" >&2
         exit 1
     }

     source_config

     if [ -z "$TABLE" -o -z "$GATEWAY" ]; then
         exit 0
     fi

     VID="`echo ${DEVICE} | \
         LANG=C egrep '(eth|bond)[0-9]+\.[0-9][0-9]?[0-9]?[0-9]?$' | \
         LANG=C sed 's/^[a-z0-9]*\.//g;s/^0*//'`"
     PHYSDEV="`echo ${DEVICE} | \
         LANG=C egrep '(eth|bond)[0-9]+\.[0-9][0-9]?[0-9]?[0-9]?$' | \
         LANG=C sed 's/\.[a-z0-9]*$//g'`"

     if [ -z ${PRIORITY} ]; then
         PRIORITY=${VID}
     fi
     action $"Setting default route ${GATEWAY} for table: ${TABLE}" \
        /sbin/ip route replace default via ${GATEWAY} dev ${DEVICE} \
            table ${TABLE}

     while `ip rule list | LANG=C egrep -q \
       "from ${IPADDR} lookup ${TABLE}"`; do
           /sbin/ip rule delete from ${IPADDR} lookup ${TABLE}
     done

     action $"Setting Source ${IPADDR} to use routing table: ${TABLE}"
\
         /sbin/ip rule add from ${IPADDR} table ${TABLE} \
             priority ${PRIORITY}

fi