[LARTC] one dude about rt_tables

[LARTC] one dude about rt_tables

[Luis Miguel Cruz Miranda]

Can I add routes to rt_tables by hand with the vi editor?
If I add a route to that file, it will be there if I reboot the box?

I am sure there are stupid questions but I can't find the answer into the 
papers I have here.

Luis Miguel Cruz Miranda.
CCNA - Systems Administrator

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Re: [LARTC] one dude about rt_tables

[Martin A. Brown]

Luis,

 : Can I add routes to rt_tables by hand with the vi editor?

/etc/iproute2/rt_tables contains a mapping of human names to routing table 
numbers.  I call them table identifiers to table ids.  This file does not 
contain routes.

 : If I add a route to that file, it will be there if I reboot the box?

If you wish to add static routes to the system at boot, you should be able
to use the system network initialization scripts and config files (e.g.,
redhat has a file /etc/sysconfig/static-routes).

Otherwise, you should write your own startup script or modify 
/etc/rc.d/rc.local to include the routes you wish to add.

If you are using network address translation, you may find my NAT SysV 
init scripts convenient:

  http://plorf.net/linux-ip/html/scripts/nat
  http://plorf.net/linux-ip/html/scripts/static-nat

Does that answer your question?

-Martin

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com


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Re: [LARTC] one dude about rt_tables

[Luis Miguel Cruz Miranda]

>/etc/iproute2/rt_tables contains a mapping of human names to routing table
>numbers.  I call them table identifiers to table ids.  This file does not
>contain routes.

So, if I understand all correctly, I don't need that file to use multiple 
route tables, do I?


>  : If I add a route to that file, it will be there if I reboot the box?
>
>If you wish to add static routes to the system at boot, you should be able
>to use the system network initialization scripts and config files (e.g.,
>redhat has a file /etc/sysconfig/static-routes).

I found a solution here:
http://www.samag.com/documents/s\x1824/sam0201h/0201h.htm


>Otherwise, you should write your own startup script or modify
>/etc/rc.d/rc.local to include the routes you wish to add.
>
>If you are using network address translation, you may find my NAT SysV
>init scripts convenient:
>
>   http://plorf.net/linux-ip/html/scripts/nat
>   http://plorf.net/linux-ip/html/scripts/static-nat
>
>Does that answer your question?
>
>-Martin
>
>--
>Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com

Luis Miguel Cruz Miranda.
CCNA - Systems Administrator

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Re: [LARTC] one dude about rt_tables

[Martin A. Brown]

 : >/etc/iproute2/rt_tables contains a mapping of human names to routing table
 : >numbers.  I call them table identifiers to table ids.  This file does not
 : >contain routes.
 : So, if I understand all correctly, I don't need that file to use multiple 
 : route tables, do I?

You are correct.  It simply maps names to numbers so that you can use
something like this if you want:

# ip route add default via 10.0.0.1 table dsl-link
# ip route add default via 10.0.0.2 table t1-link

Where the rt_tables file contains:

1       dsl-link
2       t1-link

If you do not have the file /etc/iproute2/rt_tables, you can use the 
following syntax .

# ip route add default via 10.0.0.1 table 1
# ip route add default via 10.0.0.2 table 2

 : I found a solution here:
 : http://www.samag.com/documents/s\x1824/sam0201h/0201h.htm

I've not seen this before and will have to read this article.  Thanks for
the link.

I do have some general documentation on the use of "ip route" and "ip 
rule" in the appendices of my documentation available here: 

  http://plorf.net/linux-ip/

Let me know if you find any flaws, areas for improvement, or missing 
content.

-Martin

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com



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