From: Mohammad Saeed (mzsaeed@gmail.com)
Date: Wed Sep 12 2007 - 20:15:59 ART
But in traceroute you can't set the packet size as you can do it in
Ping....and traceroute has ability that if packet gets dropped on some
device because of MTU size it will cut the size of MTU and I am not
sure, it won't tell you about that.
Regards,
Mohammad Zahed Saeed
On 9/12/07, Travis Anderson <totaldrive2000@yahoo.com> wrote:
> Mostly switches will drop the frame the exceed the MTU
> and routers/firewall will send back a ICMP/fragment.
>
> Do a traceroute. If you cannot reach the closest
> router it's probably a switch before the first router.
>
> Depending on the platform you might get a dynamic
> route with a smaller MTU if a ICMP is sent back.
>
> A packet trace will help with finding a ICMP that is
> returned.
>
> Travis,
> --- Mohammad Saeed <mzsaeed@gmail.com> wrote:
>
> > Hello everybody,
> >
> > Is there any utility that I can use to check the MTU
> > size on all the
> > devices from some source to destination?
> >
> > For example, in Extended Ping you can set the packet
> > size. I can reach
> > from a particular source to a destination if I use
> > packet size 1000,
> > but if I make it 1100 all the packets get
> > dropped.....but Ping does
> > not tell you which hop is dropping the packets...
> >
> > In Extended traceroute, there is no option of
> > setting the packet size
> > and even if some device has smaller MTU size
> > traceroute will adjust
> > the packet size for its packets to pass through that
> > device.
> >
> > So, I am looking for some way/utility to find the
> > MTU size on all the
> > devices a packet passes from some source to a
> > destinantion.
> >
> > I appreciate any help in this regard.
> >
> > Best Regards,
> >
> > Mohammad Zahed Saeed
> >
> >
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