netconf route_destination

[Patrick Farho]

I was wondering how you determine what the route_destination will be if you have multiple IP addresses with different route_gateway addresses.

I understand the [n] information, but I just do not know what to put in the route_destination. Any insight would be helpful.

Thank you,

[RAC_1]

Route destination is what use when you do route command. Like route add host/network.

Also /etc/rc.config.d/netconf gives explaination about it. so if you are going to define a route to a host it will look like follows.

ROUTE_DESTINATION[x]="host_ip_address"
ROUTE_MASK[x]=""
ROUTE_GATEWAY[x]="aa.bb.dd.ffy"
ROUTE_COUNT[x]="1" -- > one if remote, else 0
ROUTE_ARGS[x]=""

If it is going to be network, then put network address in route_destination.

[John Dvorchak]

Here is part of my /etc/rc.config.d/netconf file on a system that has 3 NICs installed:

ROUTE_DESTINATION[0]="default"
ROUTE_MASK[0]=""
ROUTE_GATEWAY[0]="123.123.123.3"
ROUTE_COUNT[0]="1"
ROUTE_ARGS[0]=""

ROUTE_DESTINATION[1]="net 172.123.123.0"
ROUTE_MASK[1]=""
ROUTE_GATEWAY[1]="172.123.123.4"
ROUTE_COUNT[1]="0"
ROUTE_ARGS[1]=""

ROUTE_DESTINATION[2]="net 172.223.223.0"
ROUTE_MASK[2]=""
ROUTE_GATEWAY[2]="172.223.223.4"
ROUTE_COUNT[2]="0"
ROUTE_ARGS[2]=""

Of course these addresses are bogus but I think you will see that for every NIC [0] there is a ROUTE_DESTINATION[0] (network address) and a ROUTE_GATEWAY[0] (default router) associated with each instance of the NIC [0] or [1] etc.

[Patrick Farho]

So if my router address is a 151.123.12.123 I should be entering something like "net 151.123.12.0"?

[John Dvorchak]

correct if your netmask is a class C network like 255.255.255.0 then the network would be the octet 123.123.123.0 because the network is always the first number of the address, in this case a 0 is used. Then the first host on that network would be 1 then 2 etc. like 123.123.123.1 and 123.123.123.2 etc.

[Patrick Farho]

What if the netmask is a 255.255.255.192 that has an ip of 151.123.12.123 or 255.255.254.0 that has an ip of 10.1.12.1?

Would the .192 still be 151.123.12.0 and the .254 be 10.1.0.0?

Thank you,

Patrick

[John Dvorchak]

If you have a bunch of these NOT Class A B or C netmasks and you want to be sure, try using a "netmask calculator" like the one I found here:

http://jodies.de/ipcalc


Address: 151.123.12.123 10010111.01111011.00001100.01 111011Netmask: 255.255.255.192 = 26 11111111.11111111.11111111.11 000000Wildcard: 0.0.0.63 00000000.00000000.00000000.00 111111=>
Network: 151.123.12.64/26 10010111.01111011.00001100.01 000000 (Class B)Broadcast: 151.123.12.127 10010111.01111011.00001100.01 111111HostMin: 151.123.12.65 10010111.01111011.00001100.01 000001HostMax: 151.123.12.126 10010111.01111011.00001100.01 111110Hosts/Net: 62

[John Dvorchak · Accepted solution]

That was pretty ugly looking so here it is a little more readable with your example:

http://jodies.de/ipcalc

Network: 151.123.12.64
Broadcast: 151.123.12.127
HostMin: 151.123.12.65
HostMax: 151.123.12.126

[John Dvorchak]

I have never seen a 255.255.254.0 netmask but I guess some network guy could think of a reason to use it.

But it does look like this:
Network: 10.1.12.0
Broadcast: 10.1.13.255
HostMin: 10.1.12.1
HostMax: 10.1.13.254

[Patrick Farho]

So, I should not have to make the 10.1.12.12 10.1.0.0 for the ROUTE_DESTINATION.

This sounds like fun, but I think my daughter would have more fun at an amusement park!