[olug] bad practices at home - not relevant!

[puzzled]

   big factor if its smaller - your IP packet which neatly fits into every
physical frame size on a hop by hop basis suddenly has to be cut into two (or
more) pieces to pass.

   real world numbers - the ethernet frame is 1514 bytes so an IP packet is
nearly that large (1460?). There were some limits related to X25 way back in
the past of 576 (I think) bytes per frame - so if you hit some old
router/misconfigured link you could wind up having each of your packets
converted to three separate fragments. Ugly, to say the least.



David Walker wrote:

> Wouldn't it be true that if the MTU for the router with the internal IP was
> the same or smaller than that of the routers on either side of it that it
> would not be a factor in Path MTU Discovery?
>
> Thanks for the article puzzled.
>
> And thanks for the illuminating message Brian.  I learned a lot from it.
> I'd appreciate it if you'd try to offer some type of explanation in the
> future as not all of us share your genius or knowledge.
>
> -----Original Message-----
> From: puzzled [mailto:puzzled]On Behalf Of puzzled
> Sent: Saturday, May 26, 2001 3:09 PM
> To: olug at bstc.net
> Subject: Re: [olug] bad practices at home - not relevant!
>
>    yeah yeah yeah, works fine outbound from you because the IP is
> reachable for you, won't work on the return leg back from the remote host.
> Doesn't seem to cause much of a problem in real life.
>
>   A much more verbose explanation can be found below.
>
> http://www.worldgate.ca/~marcs/mtu/
>
> Brian Roberson wrote:
>
> > Do you understand PMTU discovery? Obviously not.
> >
> > -----Original Message-----
> > From: puzzled [mailto:puzzled] On Behalf Of puzzled
> > Sent: Saturday, May 26, 2001 8:34 AM
> > To: olug at bstc.net
> > Subject: Re: [olug] bad practices at home - not relevant!
> >
> >    You can't route *to* an address from private space but you can route
> > *through* one as long as its within a single autonomous system.
> >
> >     This technique is used by those that have a large AS and don't want
> > to burn up/fragment their public IPs on purely internal devices.
> >
> >     Looks funny, works great! Don't think any more about it ...
> >
> > Vincent wrote:
> >
> > > Has anyone else done a traceroute to or from an @home system lately?
> > > I'm seeing private/reserved 10. addresses!?!
> > >
> > > 10.88.40.53 (10.88.40.53)  9.320 ms  9.285 ms  24.627 ms
> > >
> > > ...that's pretty lame...
> > >
> > >
>
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