Difference between revisions of "Source based routing"
(fixed forum links, use template:forum) |
m (added missing bracket) |
||
| Line 9: | Line 9: | ||
* <code>$IP</code> is an IP address which should use non-default gateway. You can also use netmask here, e.g. <code>10.9.8.0/24</code> will mean that all VEs with addresses like 10.9.8.x will be routed through the given gateway. | * <code>$IP</code> is an IP address which should use non-default gateway. You can also use netmask here, e.g. <code>10.9.8.0/24</code> will mean that all VEs with addresses like 10.9.8.x will be routed through the given gateway. | ||
* <code>$GW</code> is a gateway for this IP address. | * <code>$GW</code> is a gateway for this IP address. | ||
| − | * <code>$TBL</code> is any free table number, I use numbers from 6 upwards. Note that tables 250-255 are usually reserved (see <code>/etc/iproute2/rt_tables</code>. | + | * <code>$TBL</code> is any free table number, I use numbers from 6 upwards. Note that tables 250-255 are usually reserved (see <code>/etc/iproute2/rt_tables</code>). |
Note that every new non-standard gateway will require another table number. | Note that every new non-standard gateway will require another table number. | ||
Revision as of 17:42, 20 July 2006
Sometimes you have more than one router in your network, and want different VEs to use different routers. For that, you need to set up source-based routing on the host system. For example:
# /sbin/ip rule add from $IP table $TBL # /sbin/ip route add default dev eth0 via $GW table $TBL
where
$IPis an IP address which should use non-default gateway. You can also use netmask here, e.g.10.9.8.0/24will mean that all VEs with addresses like 10.9.8.x will be routed through the given gateway.$GWis a gateway for this IP address.$TBLis any free table number, I use numbers from 6 upwards. Note that tables 250-255 are usually reserved (see/etc/iproute2/rt_tables).
Note that every new non-standard gateway will require another table number.
For more details on routing rules, see man ip.
