, January 23, 2009 11:51 AM
To: Dunn, Jeffrey H.
Cc: Rémi Denis-Courmont; ipv6@ietf.org; Huang, Frank; Sherman, Kurt T.; Liou,
Chern; steve_eiser...@uscourts.gov; ipv6-boun...@ietf.org; v6...@ops.ietf.org;
Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Hi Jeffrey,
Here is a link
@ietf.org; Huang, Frank; Sherman, Kurt
T.; Liou, Chern; steve_eiser...@uscourts.gov; ipv6-boun...@ietf.org; v6...@ops.ietf.org
; Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Hi Jeffrey,
I have attached a picture which shows one of the topologies we use for
our PMTUD tests.
In this
...@ietf.org; v6...@ops.ietf.org;
Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Hi Jeffrey,
I have attached a picture which shows one of the topologies we use for
our PMTUD tests.
In this test case we transmit an Echo Request from REF-Host2 to TAR-
Host1 with a packet size of
; Sherman, Kurt T.;
ipv6@ietf.org; Liou, Chern; steve_eiser...@uscourts.gov; ipv6@ietf.org;
v6...@ops.ietf.org; Grayeli, Parisa
Subject: RE: End System PMTUD behavior question
On Fri, 23 Jan 2009, peter.h...@nokia.com wrote:
> For example, if a user does a "ping -s 1500" to a destinati
; Liou, Chern; steve_eiser...@uscourts.gov; ipv6-boun...@ietf.org;
v6...@ops.ietf.org; Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
In message <3c6f21684e7c954193e6c7c4573b762701d3dd7...@imcmbx1.mitre.org>, "Dun
n, Jeffrey H." writes:
> Mark,
>
> Could
On Fri, 23 Jan 2009, peter.h...@nokia.com wrote:
For example, if a user does a "ping -s 1500" to a destination whose PMTU is
1280, the only way to avoid IP fragmentation is for the ping
application to split the data into multiple messages, or for IPCMPv6 to do so.
Either way, you have to introd
In message <3c6f21684e7c954193e6c7c4573b762701d3dd7...@imcmbx1.mitre.org>, "Dun
n, Jeffrey H." writes:
> Mark,
>
> Could you elaborate on what you mean by "DNS servers just tell the kernel t=
> o fragment at network mtu for UDP/IPv6 and ensure that DF is off for UDP/IP=
> v4." What is the "netwo
t T.;
ipv6@ietf.org; Liou, Chern; steve_eiser...@uscourts.gov; ipv6-boun...@ietf.org;
v6...@ops.ietf.org; Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
In message <808f2ece7425024994976ac3d44bdcf4c8b...@vaebe108.noe.nokia.com>, Pet
er.h...@nokia.com writes:
> Heman
essage =
> size to avoid IP fragmentation.
> =20
> Peter Hunt
> Software Engineer
> Nokia S&S.
> =20
>
> --_=_NextPart_001_01C97CEC.C9F8E0DD
> Content-Type: text/html;
> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-prin
Hemant,
Forgive me if I've misunderstood, but it sounds like you're saying that we
should require protocols or applications above IP to always send data in
messages small enough to avoid IP fragemntation.
I agree it makes sense for a higher layer to use the PMTU information in IP's
cache whe
Jeffrey,
Both IPv4 and IPv6 standards recommend not to fragment. So the first
impact on the system behavior for host receiving an PTB message is to
try and not fragment. I have not paid attention to older RFC's. I am
working off of RFC 4821 that recommends a host keep "conceptual"
variables in
ps.ietf.org
; Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Hi Jeffrey,
This is Thomas Peterson from the InterOperability Laboratory at UNH.
We have done extensive testing in this area and would be happy to work
with you off line to examine this scenario.
If you would like
: End System PMTUD behavior question
> The following questions occurred to us:
> 1. Should the hosts re-transmit the ICMPv6 echo request(s) in
fragments?
If the ICMPv6 echo reqs were being used for PMTUD, the answer should be
a No. The host just received an Indication of Too Big that also sa
: Wednesday, January 21, 2009 3:00 PM
To: Dunn, Jeffrey H.
Cc: Rémi Denis-Courmont; ipv6@ietf.org; Huang, Frank; Sherman, Kurt T.; Liou,
Chern; steve_eiser...@uscourts.gov; ipv6-boun...@ietf.org; v6...@ops.ietf.org;
Grayeli, Parisa
Subject: Re: End System PMTUD behavior question
Hi Jeffrey,
This is
> The following questions occurred to us:
> 1. Should the hosts re-transmit the ICMPv6 echo request(s) in
fragments?
If the ICMPv6 echo reqs were being used for PMTUD, the answer should be
a No. The host just received an Indication of Too Big that also said
the PMTU is 1280, so the host should
t: Re: End System PMTUD behavior question
Le mercredi 21 janvier 2009 20:56:23 Dunn, Jeffrey H., vous avez
écrit :
Colleagues,
We have been performing some PMTUD tests and have found that
different
operating systems handle PMTUD differently. Specifically, we found
that the
"ping"
s-Courmont [mailto:rde...@simphalempin.com]
Sent: Wednesday, January 21, 2009 2:33 PM
To: ipv6@ietf.org
Cc: Dunn, Jeffrey H.; ipv6-boun...@ietf.org; v6...@ops.ietf.org; Sherman, Kurt
T.; Liou, Chern; steve_eiser...@uscourts.gov; Huang, Frank; Grayeli, Parisa
Subject: Re: End System PMTUD behavior qu
Le mercredi 21 janvier 2009 20:56:23 Dunn, Jeffrey H., vous avez écrit :
> Colleagues,
>
> We have been performing some PMTUD tests and have found that different
> operating systems handle PMTUD differently. Specifically, we found that the
> "ping" application behaves in the following way when the
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