[SunHELP] About route question (very interesting topic)

Kevin Stevens sunhelp at sunhelp.org
Wed Sep 5 15:01:06 CDT 2001 

They are using router-supported RARP to respond to the ARPed requests
from the worksation.  It is possible to configure Sun stations to work
this way as well, I saw the documentation a couple of months back, I
believe on Cisco's site.

KeS


--- "Fogg, James" <JFogg at vicinity.com> wrote:
> Sorry, but I don't have enough CPU cyles left in my old brain to
> scratch out
> a decent answer for this odd behaviour. I can tell you with excellent
> authority that the default gateway needs to be the address of the
> router for
> that VLAN (not to brag, but I only admin as a sideline & hobby, I am
> actually a network engineer by trade).
> 
> If you want to forward me a detailed network drawing that includes
> addresses
> of major nodes (incl. netmask) and the configs of your
> switches/routers I
> can definately produce a quick and accurate answer. But, please
> remember
> that you will compromise security by releasing such information. If
> you
> choose to take me up on my offer please as a minimum delete any SNMP
> information (espcially community strings which are really a password)
> from
> your configs.
> 
> Also remember that if you have static routes programmed into your
> equipment
> that a default gateway is irrelavent. I never suggest static routes
> in
> hosts, but someone may have done it. I **really** don't suggest it
> for Unix
> hosts unless unavoidable. For the hell of it try a netstat -r on a
> Unix
> machine and include that in the package. There is also an equivalent
> to
> netstat -r for Windows.
> 
> What I'm getting at here, is that the anomoly rests in the Windows
> world,
> not the Unix world. Another possiblity is that the network does not
> truly
> use VLANs (you can get VLAN-like behaviour without having a true
> VLAN).
> 
> <having read reply more carefully> No, Windows is not VLAN-aware. No
> O/S
> should *ever* be VLAN-aware, as it would break the reasons for having
> VLAN's. VLAN's only exist in the network world. To the attached O/S,
> it
> appears to have a LAN that is physically separate from the other
> LANs.
> 
> 
> 
> > -----Original Message-----
> > From: John Lee [mailto:johnlee at sc.mcel.mot.com]
> > Sent: Tuesday, September 04, 2001 9:48 PM
> > To: sunhelp at sunhelp.org
> > Subject: RE: [SunHELP] About route question (very interesting
> topic)
> > 
> > 
> > Hi Fogg,
> > 
> > Thanks for your input.
> > 
> > Actually, I don't think my NT machine is broken because all 
> > our more than
> > 200 NT machines have the same case. This is an interesting 
> > thing. Let me
> > decribe it in detail.
> > 
> > On one subnet 200.10.2.x(mask is 255.255.255.0), If I set one 
> > NT machine's
> > default gateway as its IP(for example: 200.10.2.25), then run
> tracert
> > command, the result will be as below:
> > -----------------------------------------
> > c:>tracert 200.2.1.27
> > Tracing route to 200.2.1.27 over a maximum of 30 hops
> > 1    <10ms    <10ms    <10ms    200.3.1.254
> > 2    <10ms    <10ms    <10ms    200.2.1.27
> > -----------------------------------------
> > If I run traceroute command  on a solaris machine with 
> > IP=200.10.2.26, the
> > result will be:
> > -----------------------------------------
> > %traceroute 200.2.1.27
> > traceroute to 200.2.1.27 (200.2.1.27), 30 hops max, 40 byte packets
> > 1    200.10.2.254(200.10.2.254)     0.397 ms  0.361 ms  0.322 ms
> > 2    200.4.3.254(200.4.3.254) 0.514 ms *  0.499 ms
> > 3    200.2.1.27(200.2.1.27)     4.116 ms *  3.323 ms
> > ----------------------------------------
> > 
> > From above, We can see NT machine's IP traffic route is different
> with
> > Solaris machine. What I want to do is let Solaris machine go 
> > through the
> > same route as NT machine. I don't know how to do. It seems 
> > that NT machine
> > is VLAN aware, but Solaris isn't.
> > 
> > By the way, Many of my colleagues think it is strange thing. 
> > But it is true
> > and I have tested on serveral subnets. Our network equiment 
> > include Cisco
> > and CableTron.
> > 
> > I think this is an interesting topic worth of discussing. I 
> > don't know if I
> > need install the third-party software on Solaris so that it 
> > can be VLAN
> > aware.
> > 
> > Thanks for all your input !
> > 
> > Best Regards
> > John
> > 
> > 
> > 
> > 
> > -----Original Message-----
> > From: Fogg, James [mailto:JFogg at vicinity.com]
> > Sent: Tuesday, September 04, 2001 9:16 PM
> > To: 'sunhelp at sunhelp.org'
> > Subject: RE: [SunHELP] About route question
> > 
> > 
> > Your NT machine is actually broken. Its default gateway should be
> the
> > gateway for the VLAN router. MS networking uses broadcast netbios
> > annoucements to "find" each other and build the network browse
> lists.
> > Because of this, the brokeness isn't apparent.
> > 
> > > -----Original Message-----
> > > From: John Lee [mailto:johnlee at sc.mcel.mot.com]
> > > Sent: Tuesday, September 04, 2001 2:50 AM
> > > To: sunhelp at sunhelp.org
> > > Subject: [SunHELP] About route question
> > >
> > >
> > > Greetings Everyone,
> > >
> > > I encounted a route question and want to get help from you.
> > >
> > > We have a network with VLAN enabled. On this network, if one
> > > NT machine have
> > > its default gateway same IP address as its IP, it will have
> > > no problem in
> > > connection to other network nodes. But for a Solaris machine,
> > > it can't.
> > >
> > > Can anyone advise me why ?
> > >
> > > Regards.
> > > John
> > >
> > > _______________________________________________
> > > SunHELP maillist  -  SunHELP at sunhelp.org
> > > http://www.sunhelp.org/mailman/listinfo/sunhelp
> > >
> > _______________________________________________
> > SunHELP maillist  -  SunHELP at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/sunhelp
> > 
> > 
> > _______________________________________________
> > SunHELP maillist  -  SunHELP at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/sunhelp
> > 
> _______________________________________________
> SunHELP maillist  -  SunHELP at sunhelp.org
> http://www.sunhelp.org/mailman/listinfo/sunhelp


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