From: Andi Kleen <ak@suse.de>
To: "Kevin W. Rudd" <ruddk@us.ibm.com>
Cc: davem@redhat.com, kuznet@ms2.inr.ac.ru, netdev@oss.sgi.com,
chester.f.johnson@intel.com
Subject: Re: PMTU issues due to TOS field manipulation (for DSCP)
Date: Wed, 10 Dec 2003 20:34:33 +0100 [thread overview]
Message-ID: <20031210203433.3747b7fd.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.44.0312101020480.21684-100000@w-kevinr.svc.beaverton.ibm.com>
On Wed, 10 Dec 2003 10:23:15 -0800 (PST)
"Kevin W. Rudd" <ruddk@us.ibm.com> wrote:
>
> Thoughts? Comments?
I don't think the network users will be very happy if you require changing all
end hosts this way. How about the following hack? For DF=1 packets
the ipid field is useless. When you rewrite the TOS to DSCP save
the old TOS in the ipid field. When you see an ICMP fragment required
message with the right DSCP on the router restore the old TOS from the ipid
field.
One drawback is that there are a few VJ header compression servers that
require changing ipid. But you can still handle these by not overwriting
all bits of ipid so that it still changes (keep a few changing bits)
-Andi
next prev parent reply other threads:[~2003-12-10 19:34 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-10 18:23 PMTU issues due to TOS field manipulation (for DSCP) Kevin W. Rudd
2003-12-10 19:34 ` Andi Kleen [this message]
2003-12-10 20:20 ` Julian Anastasov
2003-12-10 20:33 ` Nivedita Singhvi
2003-12-10 21:18 ` Julian Anastasov
2003-12-10 22:36 ` Nivedita Singhvi
2003-12-10 22:51 ` David S. Miller
2003-12-10 23:15 ` Julian Anastasov
2003-12-10 23:20 ` David S. Miller
2003-12-11 0:06 ` Julian Anastasov
2003-12-11 0:09 ` David S. Miller
2003-12-11 0:34 ` Julian Anastasov
2003-12-12 8:31 ` David S. Miller
2003-12-12 23:38 ` Julian Anastasov
2003-12-18 23:17 ` Kevin W. Rudd
2004-01-19 22:43 ` Kevin W. Rudd
2004-01-20 4:29 ` David S. Miller
2003-12-13 0:10 ` Julian Anastasov
2004-03-04 9:36 ` David S. Miller
2004-03-04 20:56 ` Julian Anastasov
2004-03-04 22:02 ` kuznet
2004-03-06 11:55 ` Julian Anastasov
2004-03-06 16:02 ` Julian Anastasov
2003-12-10 20:26 ` Kevin W. Rudd
2003-12-10 20:52 ` Andi Kleen
2003-12-10 20:30 ` Nivedita Singhvi
2003-12-10 20:55 ` Andi Kleen
2003-12-10 21:11 ` Nivedita Singhvi
-- strict thread matches above, loose matches on Subject: below --
2003-12-10 21:35 Johnson, Chester F
2003-12-10 23:36 Johnson, Chester F
2003-12-11 0:17 ` Julian Anastasov
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