Hi Tony,
Yes you were correct. There are a large number of
packets crossing the subnet. This is think creates a
bottleneck on the ethernet port on the router.
The Ping response within the same subnet also was
badly affected.( I could see a lot of users coming
towards me... so Rebooting the router saved me
temporarily.
could enabling something like ip route-cache on the
router help.
Even pinging from the router to machines on either of
the subnets gave this output
ping xxx.xxx.1.76
Sending 5, 100-byte ICMP Echos to xxx.xxx.1.76,
timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip
min/avg/max = 24/41/52 ms
#ping xxx.xxx.2.199
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to xxx.xxx.2.199,
timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip
min/avg/max = 36/48/56 m
Need your suggestions
Thanks & regards
Amit
--- Tony van Ree <[EMAIL PROTECTED]> wrote:
> Hi Amit,
>
> At the time you experience the slowness log into
> your router and check the traffic levels going into
> and out of your Ethernet port. Look also for
> broadcast errors etc. I recommend you clear the
> counters before you start. note any abnormalities.
>
> If you notice high levels of error free taffic then
> maybe put ip accounting on the ethernet
> router#conf t<return>
> router#(config)int e 0<return> (or whatever)
> router#(config-if)ip account<return>
> router#(config-if)<ctrl z>
> router#
> wait 30 seconds
> router#sh ip account
>
> This will show you who is doing the traffic out of
> your ethernet. You may notice high packet rates
> between your subnets. If so this is what you need
> to sort.
>
> If you like capture the screen showing your ethernet
> and send it to me.
>
> Secondly you may need to look at your switches.
> What sort are they? Let me know.
>
> Here are just some little trouble shooting ideas
>
> Teunis
> Hobart, Tasmania
> Australia
>
> On Tuesday, January 09, 2001 at 05:22:51 AM, Amit
> Gupta wrote:
>
> > Hi Tony,
> >
> > I am sensing something abnormal on the network.
> > During certain times of the day a ping response to
> the
> > router's ethernet interface say xxx.xxx.1.1 from a
> > station in the same subnet is also taking 60-80ms
> >
> > Need your help on this
> >
> > Regards
> >
> > Amit
> >
> >
> > --- Tony van Ree <[EMAIL PROTECTED]> wrote:
> > > Hi Amit,
> > >
> > > If you are using
> > > xxx.xxx.1.0 and xxx.xxx.2.0 the 255.255.254.0
> subnet
> > > is not going to be any good. If you are using
> > > "private addressing" then 255.255.252.0 will be
> ok.
> > >
> > > It is best you have your addresses designed to
> fit
> > > nicely into the subnet boundaries. eg
> xxx.xxx.0.0 ,
> > > xxx.xxx.1.0 or xxx.xxx.2.0, xxx.xxx.3.0. I'm
> sure
> > > you'll see what I mean.
> > >
> > > Having to two network cards in your server is a
> good
> > > idea then pointing each network to the cards.
> This
> > > will allow easier conversion into VLAN's at some
> > > later point.
> > >
> > > All you should need to do is install the second
> card
> > > and configure it to point with a gateway address
> the
> > > same as the clients on the second network. DO
> NOT
> > > HAVE A DEFAULT GATEWAY ON THE SECOND CARD.
> > >
> > > When installed you should find the xxx.xxx.2.0
> > > address will point stuff for the xxx.xxx.2.0
> network
> > > out that card. Once again to avoid confusion it
> is
> > > best to have the clients on the second LAN
> pointing
> > > to the second card in the first place.
> > >
> > > Should you go to VLAN's?
> > >
> > > Well it will take a little reconfig less than an
> > > hour I should imagine. Just this week I did
> similar
> > > with a Technical College here where I am. In
> this
> > > case we really wanted to keep the students away
> from
> > > the staff LAN's. Control was also required to
> stop
> > > unlimited access to the Internet for students.
> > >
> > > Solution,
> > >
> > > 2 VLAN's the staff on a public network
> > > ppp.ppp.pp0.000/23 and the students on a private
> > > xxx.xxx.xx0.000/23. This allows some 500
> devices on
> > > each network. In this case there are some 30
> > > switches involved. The servers and access
> switches
> > > (mainly Cat1900) come back to a a Cat5000. Some
> of
> > > the servers have two network cards one to each
> > > network. The router in this case is not the
> normal
> > > run of the mill router so the config here is
> > > different but what would do fine is running ISL
> > > trunking back to the switch from the router then
> > > have 2 sub interfaces under the Ethernet port
> (one
> > > for each VLAN).
> > >
> > > This allows access lists and individual control
> for
> > > each network.
> > >
> > > As a form of traffic control whilst the staff
> card
> > > in the server has a 100Meg Full duplex setting
> the
> > > second card in the server has a 10Meg/Half on
> the
> > > student LAN. This restricts the utilisation by
> the
> > > students.
> > >
> > > As you can see the are a multitude of ways to
> hanle
> > > the problem based on your needs. However, the
> > > important thing is to get your initial design
> right.
> > > Keep it simple and follow the fundamental
> rules.
> > >
> > > Keep smilin'
> > >
> > > Teunis,
> > > Hobart, Tasmania
> > > Australia
> > >
> > >
> > > On Wednesday, January 03, 2001 at 11:56:58 PM,
> Amit
> > > Gupta wrote:
> > >
> > > > Hi Tony,
> > > >
> > > > Got the idea ..
> > > >
> > > > Wonder if putting each of these networks in a
> > > > different VLAN would also help.
> > > >
> > > > I think supernetting is also a good solution.
> > > >
> > > > Just another query that by placing 2 network
> cards
> > > on
> > > > the servers will the router's ethernet
> interface
> > > not
> > > > come into picture for cross subnet
> communication.
> > > >
> > > >
> > > > Thanks for your timely help.
> > > >
> > > > Amit
> > > > New Delhi, India
> > > >
> > > > --- Tony van Ree <[EMAIL PROTECTED]> wrote:
> > > > > Hi Amit,
> > > > >
> > > > > Ok you have an issue that can be overcome by
> two
> > > > > methods. I assume xxx.xxx are the same.
> > > > >
> > > > > 1 By flattening your network ie setting the
> > > subnet
> > > > > masks on your servers and clients to
> > > 255.255.254.0
> > > > > the two subnets will appear as one. The
> traffic
> > > on
>
=== message truncated ===
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