Wireshark · Wireshark-users: Re: [Wireshark-users] Lost packets can not ping my machine on my network

[Stephen Fisher <stephentfisher@xxxxxxxxx>]

On Sun, Oct 08, 2006 at 03:43:23PM +0100, wrote:

> My problem is that I can not ping to M1 from M2 or M3 ??? but I can 
> Ping M1 from M1 of course -- I can Ping M2 to M3 or vis versa works .. 
> Ping M1 to M2 or M3 works as well

I assume all three machines are on the same IP subnet?  Can you make 
connections from M2/M3 to M1 other than ping?

> But I do not know how to read the info & from what machine to what .. 
> I pinged M2 to M1 and saw some bad check sums ?? I really need some 
> help with this so I can attempt to solve this

Which machine were you running Wireshark/Ethereal on when you did the 
ping?  Sometimes network cards process the checksums themselves and 
incorrectly hand it to the operating system/network monitoring software 
with an incorrect checksum so this may be a false alarm (or may not be).  
Did you see the icmp echo go out of M2 and/or come in to M1?  It may be 
helpful to run Wireshark/Ethereal on both M1 and M2 or M3 then ping back 
and forth between them.  A proper ping will have an echo request from 
source to destination then an echo reply the reverse direction.


Steve