* IPv4 TOS vs DSCP
@ 2020-11-12 0:09 Russell Strong
2020-11-12 16:13 ` Stephen Hemminger
0 siblings, 1 reply; 2+ messages in thread
From: Russell Strong @ 2020-11-12 0:09 UTC (permalink / raw)
To: netdev
Hello,
After needing to do policy based routing based on DSCP, I discovered
that IPv4 does not support this. It does support TOS, but this has
never been upgraded to the new ( now quite old ) DSCP interpretation.
Is there a historical reason why the interpretation has not changed?
I could copy the dscp into a fwmark and then use that, but that seems a
little unnecessarily complicated. If I were to change this, what would
be the objections?
Russell
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: IPv4 TOS vs DSCP
2020-11-12 0:09 IPv4 TOS vs DSCP Russell Strong
@ 2020-11-12 16:13 ` Stephen Hemminger
0 siblings, 0 replies; 2+ messages in thread
From: Stephen Hemminger @ 2020-11-12 16:13 UTC (permalink / raw)
To: Russell Strong; +Cc: netdev
On Thu, 12 Nov 2020 10:09:54 +1000
Russell Strong <russell@strong.id.au> wrote:
> Hello,
>
> After needing to do policy based routing based on DSCP, I discovered
> that IPv4 does not support this. It does support TOS, but this has
> never been upgraded to the new ( now quite old ) DSCP interpretation.
>
> Is there a historical reason why the interpretation has not changed?
>
> I could copy the dscp into a fwmark and then use that, but that seems a
> little unnecessarily complicated. If I were to change this, what would
> be the objections?
>
> Russell
Probably a couple of reasons: no one needed it badly enough to work on it.
And more importantly any change would have to retain the legacy behavior
as the default.
^ permalink raw reply [flat|nested] 2+ messages in thread
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