On 24 May, 05:32, wilowolf <wilow...@terra.net.lb> wrote:
> Hi,
>
> I have two routers connected connected back to back with an Ethernet
> cable. I set MTU size on bother GigaEthernet intefaces to 1524 yet,
> when the routers cant ping each with packets of size more than 1518
> when set the DF on. Any hint ?
Maybe you have already taken this into account, however:
There is no standard for a ping program.
The size specified as a parameter to the ping command
may not be the "ethernet" packet length.
It may be -
Frame length with CRC - default for ethernet is 1518
Frame length without the CRC - 1514
IP packet total length - 1500
IP packet total length less the IP header
ICMP payload length - ?
Some other number the designer fancied at the time
It may also vary (and does if I recall correctly)
with the exact ping program being used. Cisco
router one being different from Windows one I
suspect.
I always just check with wireshark on a PC.
I seem to recall that on Windows you specify -l 1472
to get a maximal length ethernet packet (however
that may well be incorrect). This I guess will be the ICMP
payload length.
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