RE: pls help about mtu setting again

["kmedcalf () dessus com" <kmedcalf () dessus com>]

1472 is the maximum ICMP payload size for standard Ethernet.  1480 fails because, well, it is > 1472.

--
()  ascii ribbon campaign against html e-mail
/\  www.asciiribbon.org

> -----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=1470 time=96ms TTL=50
> Reply from 98.137.149.56: bytes=1470 time=91ms TTL=50
> Reply from 98.137.149.56: bytes=1470 time=92ms TTL=50
> Reply from 98.137.149.56: bytes=1470 time=89ms TTL=50
>
> Ping statistics for 98.137.149.56:
>   Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
> Approximate round trip times in milli-seconds:
>   Minimum = 89ms, Maximum = 96ms, Average = 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:
>   Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
>
> Thank you for your help