[70337] in North American Network Operators' Group
Re: Type of Service (TOS)
daemon@ATHENA.MIT.EDU (Vicky Rode)
Mon May 10 17:31:47 2004
Date: Mon, 10 May 2004 14:31:20 -0700
From: Vicky Rode <vickyr@socal.rr.com>
Reply-To: vickyr@socal.rr.com
To: Scott McGrath <mcgrath@fas.harvard.edu>
Cc: Vicky Rode <vickyr@socal.rr.com>, nanog@merit.edu
In-Reply-To: <Pine.LNX.4.58.0405101413300.28254@ls03.fas.harvard.edu>
Errors-To: owner-nanog-outgoing@merit.edu
Hi,
Do you know by default if the routers pass the TOS bits?
regards,
/vicky
Scott McGrath wrote:
>
> The answer is it depends. routers _usually_ honor the TOS bits unless
> they are configured to clear or rewrite them. We use the TOS bits for
> designating traffic classes so in some cases we rewrite the TOS bits set
> by the host so in your case we would modify the TOS bits.
>
> Scott C. McGrath
>
> On Mon, 10 May 2004, Vicky Rode wrote:
>
>
>>Hi there,
>>
>>Say if I had a qos appliance installed on networks between a lan and a
>>wan box would the qos policies be carried across wan end points (point
>>to point connection)? In other words, will the router retain the TOS
>>bits across to the other side of the wan connection to provide QoS-style
>>priority for the packets or will it clear the TOS bits? BTW, the other
>>side of the wan connection also has the qos appliance sitting between a
>>lan and a wan box.
>>
>>Just so that I'm clear, I'm not talking about an upstream neighbor being
>>an ISP connection which I know they will likely ignore the TOS bits
>>unless I pay them extra for the feature. The above scenario is a point
>>to point connection to a remote site.
>>
>>
>>Any insight will be appreciated.
>>
>>
>>regards,
>>/vicky
>>
>
>
