Hubs, repeaters, and level 2 switches do not reduce the
size of packets. Routers decrement the TTL field, but
do not change the size of the packet (this is assuming
the same media on both sides of the device).
Runt packets on ethernet are a result of collisions. Too
many repeaters/hubs cause problems because such
topologies can cause the collision detection algorithm
to fail.
-paul
--On Friday, 14 April, 2000 18:12 -0700 Marc Renner
<[EMAIL PROTECTED]> wrote:
> Sheesh! one hastily posted suggestion is all it takes to really get
> yourself put in check!
>
> You are right for the most part, however every hop (hub OR repeater)
> DOES reduce the size of the packet (hence the "Runt" errors)..why do you
> think theyre called "runt" packets?? cuz theyre too small..
>
> You are correct about the routing loop being the problem however..
>
> I only saw the "Too Many Hops" part of the original post, hence the
> hasty post (I'll try to read more of the message in the future *smile*)
>
>
> Hope this helps you out..
>
> cheers..
>
> +++++++++++++++++++++++
> Marc Renner - Director http://ci.marysville.wa.us
> Network Operations Dept. Mailto:[EMAIL PROTECTED]
> City of Marysville, Wa. (360) 651-5000
> ISSA Member # 10281 http://www.issa.org
> +++++++++++++++++++++++
>
>>>> Shamsul <[EMAIL PROTECTED]> 04/13/00 12:18AM >>>
>
> Hello Marc,
>
> I have read your reply to firewall mailling list and I beg to differ
> with your opinion.
>
> I believed if you cascade too many hub together, you will only see
> 'runt error' due to delay cause by hub everytime it pass packet to
> another hub. And I believed a hub is just like a repeater which just
> propagate any packet without doing anything on the packet.
>
> The problem experience by Syed might be due to its routing loop or might
> be due to other error which is premature for us to determine with the
> information given.
>
> I hope thats help you out.
>
> Shamsul
> APNIC
>
> Date: Wed, 12 Apr 2000 14:27:23 -0700
> From: "Marc Renner" <[EMAIL PROTECTED]>
> Subject: Re: Too many hops
>
> You can't have more than 4 hops (hubs) between your workstation and your
> firewall.
>
> What you can do is replace 1 or more hubs with switches. The reason is
> that every hub your packets go through strips off a bit from the header,
> and after 4 there isnt enough left to make the entire trip. (in a
> nutshell, anyway). Switches do not strip this Bit from the header and
> thus don't limit you to the 3-4-3 rule.
>
> Or, your Firewall or mail server may be hozed..but thats another issue
> entirely.
>
> cheers..
>
>>>> Syed Qamar <[EMAIL PROTECTED]> 04/12/00 10:32AM >>>
> Hi,
>
> I am trying to send mail through firewall but getting following message:
>
> <<returned mail: too many hops 18(17 max): from <> SIZE=5889 via
> localhost, to firewall.
>
> the number of these messages are increasing every day. Does any one have
> any clue about this error message. I am not very strong in routers and
> will appreciate any input on this error.
>
> thanks
>
> syed
>
>
>
>
> -
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