[TriLUG] why is it slow?

[Brian McCullough]

On Tue, Sep 12, 2006 at 04:53:07PM -0400, jason watts wrote:
> 
> >On 9/11/06, jason watts <jsnthegod at hotmail.com> wrote:
> >
> >> i noticed that doing my ip address
> >>71.71.xx.xx takes forever to load, but if i stay in my network, my
> >>192.xx.xx.xx address, it loads instantly.  when my dad trys to load the
> >>website, he has a delay of about 3 or 4 seconds to load one of the images.
> >>
> >>so, my thought to that is that it is getting confused trying to go out of 
> >>my
> >>house and come back in?
> >>other than this, i have no real idea as to what is up with this.
> 
> >Some appliance routers have problems with looping back the address of
> >their external wan interface when it comes from the lan side.   Some
> >just can't do it at all, I suppose others might do it but with
> >performance problems.


OK, I think I understand now, but feel free to correct me.

You are on your LAN, with a private IP, 192.168.123.456, trying to talk
to another machine on your LAN, 192.168.123.457, and see very good
speeds.  However, if you try to address the second machine with an
"outside" address, 71.71.123.457, from that same internal machine,
192.168.123.456, your throughput drops to nothing.  I have never ( ? )
been able to do such a thing, using any firewall that I have used,
because they generally refuse to pass traffic ( let me see if I can get
the language correct ) that is addressed to the external interface, but
originates on the internal interface.  This is, perhaps, a special case,
since, of course, you can originate other external traffic ( all of your 
Internet traffic ) on the internal interface, but in that case it is
trying to go out through the external interface, not coming in.

Am I understanding?


Thanks,
Brian