[127363] in North American Network Operators' Group
RE: pls help about mtu setting again
daemon@ATHENA.MIT.EDU (kmedcalf@dessus.com)
Wed Jun 23 15:43:11 2010
Date: Wed, 23 Jun 2010 15:42:58 -0400
In-Reply-To: <AANLkTinmsBXQYphJiq95U1azM8MAjmfhDs2j4DJ4Dsnt@mail.gmail.com>
From: "kmedcalf@dessus.com" <kmedcalf@dessus.com>
To: "Deric Kwok" <deric.kwok2000@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
1472 is the maximum ICMP payload size for standard Ethernet. 1480 fails be=
cause, well, it is > 1472.
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>-----Original Message-----
>From: Deric Kwok [mailto:deric.kwok2000@gmail.com]
>Sent: Wednesday, 23 June, 2010 12:53
>To: nanog list
>Subject: pls help about mtu setting again
>
>Hi
>
>Thank you for your reply about DSL mtu
>
>Now I have question about internet cable connection. ls it same as DSL?
>
>I tested it in my friend cable connection.
>
>1470 is fine but 1480 is problem. Why it needs header in cable connection
>also?
>
>C:\Documents and Settings\deric>ping yahoo.com -f -l 1470
>
>Pinging yahoo.com [98.137.149.56] with 1470 bytes of data:
>
>Reply from 98.137.149.56: bytes=3D1470 time=3D96ms TTL=3D50
>Reply from 98.137.149.56: bytes=3D1470 time=3D91ms TTL=3D50
>Reply from 98.137.149.56: bytes=3D1470 time=3D92ms TTL=3D50
>Reply from 98.137.149.56: bytes=3D1470 time=3D89ms TTL=3D50
>
>Ping statistics for 98.137.149.56:
>=A0 Packets: Sent =3D 4, Received =3D 4, Lost =3D 0 (0% loss),
>Approximate round trip times in milli-seconds:
>=A0 Minimum =3D 89ms, Maximum =3D 96ms, Average =3D 92ms
>
>C:\Documents and Settings\deric>ping yahoo.com -f -l 1480
>
>Pinging yahoo.com [98.137.149.56] with 1480 bytes of data:
>
>Packet needs to be fragmented but DF set.
>Packet needs to be fragmented but DF set.
>Packet needs to be fragmented but DF set.
>Packet needs to be fragmented but DF set.
>
>Ping statistics for 98.137.149.56:
>=A0 Packets: Sent =3D 4, Received =3D 0, Lost =3D 4 (100% loss),
>
>Thank you for your help
