Route table max up to 32K

Ondrej Zajicek santiago at crfreenet.org
Mon Nov 18 12:28:33 CET 2013


On Wed, Nov 06, 2013 at 09:30:26AM +0200, Sergey Popovich wrote:
> ?? ???????????? ???? 5 ???????????? 2013 15:19:20 ???????????????????????? Bryan Duff ??????????????:
> > Any reason why the max route table is limited to 256 and not the Linux
> > limit of 32767?
> > 
> 
> This is a BIRD kernel protocol implementation limitation. This limitation
> comes from old kernel versions where table id represented in rtnetlink
> protocol message structure as "unsigned char" (8 bits long, 256 values max).
> 
> Modern Linux kernels has support for 4294967295 table ids, implemented
> as rtnetlink attribute RTA_TABLE with 32 bit length.

Hello

Thanks for the thorough overview, i was not aware of RTA_TABLE
attribute.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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