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what is the size of icmp echo reply ?

we can do extended ping and change the size of the ping request,

but what will be the size of echo request ?

does this varies and is it the same for cisco router or pc ?

2 REPLIES

Re: what is the size of icmp echo reply ?

I would think is the same size. As it the receiver would only reply your packet.

so it would only change icmp type, and source/destination IP.

check the reply:

C:\Documents and Settings\Administrator> ping -l 1500 19.18.249.1

Pinging 19.18.249.1 with 1500 bytes of data:

Reply from 19.18.249.1: bytes=1500 time=2ms TTL=255

Reply from 19.18.249.1: bytes=1500 time=2ms TTL=255

Reply from 19.18.249.1: bytes=1500 time=2ms TTL=255

Reply from 19.18.249.1: bytes=1500 time=2ms TTL=255

Ping statistics for 19.18.249.1:

Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

Approximate round trip times in milli-seconds:

Minimum = 2ms, Maximum = 2ms, Average = 2ms

HTH,

please rate this post if it do

Vlad

Re: what is the size of icmp echo reply ?

when ever you ping using extended facility you will get the reply with the same byte of packets...

as you know in window when ever you are going to ping the destination with various packet size, you will receive the same size of packet reply...

ya their may be possiblity that you will have variable time in ms due to the congesition or any other problem...

actully extended ping facility you can use for check it out the MTU size or you can send packe using DF bit also, so you can have lots of practical testing using it...

hope this will clear your idea

rate all the useful post

regards

Devang

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