Router Problem

Wed Apr 6 16:58:05 UTC 2005

brad.mugleston at comcast.net wrote:
> On Tue, 5 Apr 2005, Rick Stevens wrote:
> 
> 
>>brad.mugleston at comcast.net wrote:
>>
>>>On Mon, 4 Apr 2005, Rick Stevens wrote:
>>>
>>>
>>>
>>>>brad.mugleston at comcast.net wrote:
>>>>
>>>>
>>>>>On Sat, 2 Apr 2005, Ted Potter wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>just guessing but you have two routers both using the same ip block
>>>>>>space. So how does one router route to the other router. Wow, can't
>>>>>>believe I just typed that.
>>>>>>guess two: turn the wireless router in to a wireless access point.
>>>>>>
>>>>>>trust me when I say I am guessing. Someone with network experience
>>>>>>should be able to squash my little guesses like bugs.
>>>>>>
>>>>>>hth
>>>>>>
>>>>>
>>>>>
>>>>>Ted,
>>>>>
>>>>>Thanks for the guesses 8^)
>>>>>
>>>>>Let me see if I understand them.
>>>>>
>>>>>G1 - As they are both 192.168.1. I can go from one to the other
>>>>>but not back out.  I believe your saying I should change one to
>>>>>192.168.2. (the wireless as it's only got one machine connected
>>>>>so it should be eaiser).  Will that give me any problems getting
>>>>>in and out of other computers?
>>>>
>>>>Wait...both the Linksys and the Motorola are use the same IP?  Bad!
>>>>You're only allowed one machine per IP per network segment.
>>>>
>>>>It's possible you've got conflicting routes.  It'd help if you were to
>>>>show us the config for both the Linksys and Motorola devices, as well
>>>>as the routing table ("netstat -rn") of a machine having problems.
>>>>
>>>>
>>>>
>>>>>G2 -not sure what a wireless access point is.....
>>>>
>>>>Any radio that connects wireless machines to wired networks is an access
>>>>point.  While the term is generally reserved for devices that do only
>>>>that, an AP can do other things as well.  For example, your wireless
>>>>routers is also an access point--since it connects wireless devices to
>>>>your wired network.
>>>>----------------------------------------------------------------------
>>>>- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
>>>
>>>
>>>OK, I think I'm confusing things
>>>
>>>Linksys - assigned IP 192.168.1.1
>>>Motorola assigned IP 192.168.1.2
>>
>>Ah.  Ok.
>>
>>
>>>Linksys does DHCP for all other addresses.
>>
>>You're sure?  You've verified the Motorola's DHCP (if it has it) is
>>turned off?  As Regan once said, "Trust, but verify!"
> 
> 
> Yep, the Motorola would assign the next address as 192.168.1.3 or
> at least that's what it says if it wasn't greyed out.
> 
> 
>>>Wireless computer not available right now but it's assigned IP
>>>was 192.168.1.107 the other day.  I could ping both 192.168.1.2
>>>and 192.168.1.1 but nothing else on the home network (i.e. 192.168.1.100
>>>my son's computer).  My Linux machine has a fixed IP of 192.168.1.50 so
>>>others can get their mail.  I could not ping that either from
>>>192.168.1.2.
>>>
>>>I'll get the wireless machine and try it out tomorrow.
>>
>>Ok.  When you get it back up, check the following:
>>
>>"ifconfig -a" and check the IP and the netmask.  Your netmask should
>>probably be 255.255.255.0, but 255.255.0.0 will also work (the non-
>>routable network 192.168 is a /16).
> 
> 
> 255.255.255.0
> 
> 
>>"netstat -rn" and check the default gateway (the one with "0.0.0.0"
>>under the "destination" column).
> 
> 
> Not good - I went into the Motorola and set up a gateway of
> 192.168.1.1 (the Linksys machine) and now I can PING the network.

Hmmm, that smells like the Motorola is also acting as a router.  I'd
look at it and see if it has multiple operational modes.  If it does,
you probably want it in "access point" mode.  Your Linksys is your
router and you don't need two routers.

Wireless devices typically have three modes:

Access point:  An access point typically just takes data on the wired
network and transmits it over the wireless.  Conversely, received
wireless traffic gets transmitted over the wire.  In other words, it
acts like someone simply attached an antenna to the wired network.  It
doesn't need an IP address assigned to it as it's just an antenna, but
often does for management purposes.

Bridge: Connects two segments of a wired network via a radio link.
You've probably heard of using microwave links between parts of a LAN?
Those microwave sets are acting as a wireless bridge.  802.11a/b/g isn't
really great at this due to their relatively short ranges.  Again, IPs
aren't needed but are often used for management purposes.

Client:  Acts as a wireless interface for a device that doesn't have
one.  For example, if you had a hub (note: a hub--not a switch), you
could attach it to a wireless client device.  You can then plug multiple
devices into that hub and let them all share the wireless.  Note that
the wireless client device needs an IP address of its own, but the
devices plugged into the hub use their own IPs.
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-   NEWS FLASH! Intelligence of mankind decreasing!  Details at...   -
-     uh, when, uh, the little hand is, uh, on the...  Aw, NUTS!     -
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