How to enable more than ~256 routing tables?

How to enable more than ~256 routing tables?

[Ben Greear]

I would like to have a routing table per interface, and would like to support
1k interfaces or so (virtual interfaces like vlans, for instance).

I notice in rtnetlink.h there is this code:

enum rt_class_t
{
	RT_TABLE_UNSPEC=0,
/* User defined values */
	RT_TABLE_DEFAULT=253,
	RT_TABLE_MAIN=254,
	RT_TABLE_LOCAL=255
};
#define RT_TABLE_MAX RT_TABLE_LOCAL


Is it possible to just change the RT_TABLE_MAX to be higher and have 256-????
be more /* User defined values */ ?

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>       <Ben_Greear AT excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear

Re: How to enable more than ~256 routing tables?

[YOSHIFUJI Hideaki / 吉藤英明]

In article <3EA4EAFD.5020808@candelatech.com> (at Tue, 22 Apr 2003 00:10:53 -0700), Ben Greear <greearb@candelatech.com> says:

> Is it possible to just change the RT_TABLE_MAX to be higher and have 256-????
> be more /* User defined values */ ?

No. rtm_table in rtmsg{} is unsigned char.

-- 
Hideaki YOSHIFUJI @ USAGI Project <yoshfuji@linux-ipv6.org>
GPG FP: 9022 65EB 1ECF 3AD1 0BDF  80D8 4807 F894 E062 0EEA

Re: How to enable more than ~256 routing tables?

[Ben Greear]

YOSHIFUJI Hideaki / ???? wrote:
> In article <3EA4EAFD.5020808@candelatech.com> (at Tue, 22 Apr 2003 00:10:53 -0700), Ben Greear <greearb@candelatech.com> says:
> 
> 
>>Is it possible to just change the RT_TABLE_MAX to be higher and have 256-????
>>be more /* User defined values */ ?
> 
> 
> No. rtm_table in rtmsg{} is unsigned char.

Thanks for the response...but I was definately hoping for some better
news!

I'm guesing that to change this would mean at least a recompile of
the user-space 'ip' utility, (and who knows what else!)

Why o why did someone think that 256 was all anyone would ever want!

Think we could at least increase this to 16 bits for 2.5?

Ben

-- 
Ben Greear <greearb@candelatech.com>       <Ben_Greear AT excite.com>
President of Candela Technologies Inc      http://www.candelatech.com
ScryMUD:  http://scry.wanfear.com     http://scry.wanfear.com/~greear