Re: route takes long time to give the table

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Date: Wed, 17 Nov 2004 13:00:16 -0800 (PST)
To: debian-user@lists.debian.org

--- "H. S." <greatexcalibur@yahoo.com> wrote:

> Sergio Basurto Juarez wrote:
> > --- "H. S." <greatexcalibur@yahoo.com> wrote:
> >
> >
> >>Apparently, _Riccardo Tortorici_, on 16/11/04
> >>22:39,typed:
> >>
> >>>Check your iptables settings...I had this problem
> >>
> >>months ago...
> >>
> >>What did you find your problem was? How did you
> >>solve it?
> >>
> >>->HS
> >>
> >>
> >>
> >>>H. S. wrote:
> >>>
> >>>
> >>>>On Debian Testing running 2.6.7,the 'route'
> >>
> >>command is taking
> >>
> >>>>unusually long time to give the table:
> >>>>~# time route
> >>>>Kernel IP routing table
> >>>>Destination Gateway Genmask Flags
> >>
> >>Metric Ref Use Iface
> >>
> >>>>x.y.z.z * 255.255.255.255 UH
> >>
> >>0 0 0 ppp0
> >>
> >>>>192.168.1.0 * 255.255.255.0 U
> >>
> >>0 0 0 eth0
> >>
> >>>>192.168.0.0 * 255.255.255.0 U
> >>
> >>0 0 0 eth1
> >>
> >>>>default x.y.z.z 0.0.0.0 UG
> >>
> >>0 0 0 ppp0
> >>
> >>>>real 0m20.010s
> >>>>user 0m0.002s
> >>>>sys 0m0.002s
> >>>>
> >>>>
> >>>>However, 'route -n' command gives the output
> >>
> >>almost instantly.
> >>
> >>>>Anybody else experiencing this? Any idea why
> this
> >>
> >>would be so?
> >>
> >>>>->HS
> >>>>
> >>>>
> >>>
> >
> > When you type the command:
> > #route -n
> > you are telling to route that does not try to
> resolv
> > names. That's why it returns almost immediatly.
> > Nevertheless if your dns server is setup correctly
> it
> > does not have to take long time in fact the
> difference
> > is tiny:
> >
> > # time route
> > Kernel IP routing table
> > Destination Gateway Genmask
> Flags
> > Metric Ref Use Iface
> > 10.0.0.0 * 255.255.255.0 U
>
> > 0 0 0 eth1
> > 192.168.0.0 * 255.255.255.0 U
>
> > 0 0 0 eth0
> > default 10.0.0.1 0.0.0.0 UG
>
> > 0 0 0 eth1
> >
> > real 0m0.005s
> > user 0m0.000s
> > sys 0m0.000s
> > # time route -n
> > Kernel IP routing table
> > Destination Gateway Genmask
> Flags
> > Metric Ref Use Iface
> > 10.0.0.0 0.0.0.0 255.255.255.0 U
>
> > 0 0 0 eth1
> > 192.168.0.0 0.0.0.0 255.255.255.0 U
>
> > 0 0 0 eth0
> > 0.0.0.0 10.0.0.1 0.0.0.0 UG
>
> > 0 0 0 eth1
> >
> > real 0m0.003s
> > user 0m0.010s
> > sys 0m0.000s
> >
> >
> > Regards.
>
>
> Ah. Thanks for the explanation. I am connecting to
> my ISP through ADSL
> modem (that x.y.z.z was my IP at that time). So from
> your explanation
> the problem could be at their end?
>
> ->HS

Yes, I think so, nevertheless you can test this if you
setup a bind9 server as a caching only name server,
and the response from route -n should be faster than
the one you have right now.

Extending the explanation:
Also if you have a private network and route try to
resolve the ip's from your private network to names,
then the problem comes becuase your ISP does not map
your private ip's to names, and that's why it takes
too much time. Then if you have a private network I
recommend you set up a caching only server, and
resolve your ip's to names, you do not need a public
domain, but you must have a line in your named.conf
like

notify no;

in order to don't get other servers confused with the
private domain that you will use. Also you can map
your ip's just to names like 192.168.0.1 correspond to
alex_arc for example.

You can get a much better picture of all with the
DNS-HOWTO and also recommend you to read the RFC's
that comes in the HOWTO (Just for fun).

Regards.

=====

--
Sergio Basurto J.
If I have seen further it is by standing on the 
shoulders of giants. (Isaac Newton)
--
		
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