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Virgin Media 'Cabled' Broadband + Cisco Small Business WRVS4400N Wireless Router problems

Posted on 2009-05-18
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Last Modified: 2013-11-10
Ok Interesting one here

System was all set up and appears to work ok,  the network comprises of 4 wireless clients, and 1 'occasionally' hard wired client (laptop).  All clients connect to the Cisco Router, and gain the internet through the routers connection to the Virgin modem.

However there are some idiosynconies (if thats how its spelt)

1.  If the only 'hard' wired conenction is not connected.  None of the wireless clients seem to have access to the internet.  allthough they report there connection to the router is fine.  Only by plugging the wired pc in do we get internet.

2.  Occasionally,  we have total loss of the internet, again we seem to connect to the router ok, just that the router looses the connection to the virgin modem.  This reason is totally unknown. we have to pull the plug on the virgin modem and plug it back in for the router to gain DHCP, only for it to loose it again a little while later.  I'm not sure why this is happening.  

I know virgin 'cabled' modems only ever give out 1 IP, so once its given out that it wont service anymore DHCP requests.  but as far as i can tell, i dont know why the cisco router would drop its WAN IP and ask for another.   if this is indeed whats going on.
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Question by:tiranathon
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by:tiranathon
ID: 24412002
update : seems i was mistaken, once the 'wired' client is disconnected from the network, none of the 'wireless' clients will obtain a IP from the router.

Error log on the router reveals :

May 18 14:33:26 - unexpected reply: 535 Error: authentication failed

but no idea why, as soon as i connected the wired client back to the router, the wireless clients work correctly again!... strange, anyone have any idea?

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mutahir earned 500 total points
ID: 24415778
Which cisco router are you using ?
IOS version ?
Is your cisco router just connected to the virgin modem and serving 4 wireless and one wired client only and nothing else ?
Does your cisco have anyother configuration on it, like a vpn server config or any other ?
to isolate the fault, I would suggest either :
a) Use anyother router (for temp/test purposes) and see if wireless and wired works fine
b) Try to use any other or a new wireless client and see what happens ?
The wireless laptops (their operating system type and version), do they have the latest wireless drivers installed?
I would still suggest to check with any other router (broadband router) and see if everything works
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by:tiranathon
ID: 24419587
@ Mutahir

Cisco Router is the WRVS4400N (mentioned in the title) its a wireless router with VPN and security

Cisco router sits between Virgin's Modem (Cable) and the 4 wiresless laptops + another laptop which is hardwired
(note: the 5th laptop has to be hard wired as without it being so, no one can connect to the router) we would like it to be wireless as well. but this is the core problem.  This particular laptop is taken out of the office on a daily basis as its needed for the road.

a) cant test with another router as we dont have one.

b) tested it with another laptop from home, again... unless the one laptop is 'hard wired' via ethernet is connected, nothing else connects.

ALL the wireless clients, detect the router, but fail to get a DHCP IP address... i suppose i could manually set their IP addresses up to get round it, that might work, but surely the DHCP SHOULD work!

As soon as the laptop next to the router is plugged directly in, they all get connection straight away with no problems!
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Assisted Solution

by:mutahir
mutahir earned 500 total points
ID: 24424867
Hi,
What OS is running on the laptops ?
What is the wireless Security standard you are using on your cisco router ?
Try to unsecure your wireless network completely (no Security, no wep, wpa, no wpa2psk) and then see if everything connects
Make sure the DHCP is running on your cisco router
If no security on router and your clients connect then try to use WEP and see if they connect
Let me know after these steps and please provide what laptops are they (latest ones or old ones ) operating system
switch off/disable any firewall on your router.
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by:tiranathon
ID: 24429491

Hi,

What OS is running on the laptops ?
            All laptops are running Windows XP

What is the wireless Security standard you are using on your cisco router ?

             WPA/TKIP
Try to unsecure your wireless network completely (no Security, no wep, wpa, no wpa2psk) and then see if everything connects

            I'll try this and let you know the results
Make sure the DHCP is running on your cisco router
             Yes it is runnning


If no security on router and your clients connect then try to use WEP and see if they connect
                 

Let me know after these steps and please provide what laptops are they (latest ones or old ones ) operating system
             Some old, some new, oldest is a dell inspiron 1200

switch off/disable any firewall on your router.

            Disabled Firewall to no avail
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Author Comment

by:tiranathon
ID: 24471881
ok latest results

I disabled all security on the router, so it was completly unsecured.

Still had the same problem, wireless clients find the router, it reports its connected, but 'limited or no connection' is displayed, upon doing ipconfig at this point, reveals a privatly assigned 169.... IP address, pursumably because the router failed to give out DHCP.

So at this point i tried disabling any and all firewalls on the laptops to see if that was interfering with the authentication process... again, 'limited or no connection' and a private 169... address.

So then i overrode the DHCP, and manually configured the machines IP's to 192.168.1.n, filled out the gateway and dns servers manually. ... result.. Instant connection! Internet and everything works properly!

However, if you set back to manual, its back to 'limited or no connection'

I've hard reset the router, i've cleared the cache etc. and run out of ideas.

and STILL the strange thing that ONLY when the laptop upstairs (next to the router) is connected to it through ethernet cable as apposed to wireless... can the other machines connect wirelessly on DHCP with no problems.

As soon as we unplug the laptop upstairs from the ethernet port, do all the wireless machines loose their ability to connect.

I'm assuming as a result of this, its not the security on the router but some sort of fault with the DHCP server within the router not servicing DHCP request's unless something is already connected using Ethernet.

However I have no way of resolving it that i know of, any idea's?
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by:tiranathon
ID: 24528303
update again : Having the router replaced totally now, i suspect it maybe faulty. if i still have the same fault i think i'll go spare!

let me know if anyone has any ideas or experienced the same problem?

Cheers

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Author Closing Comment

by:tiranathon
ID: 31582527
no a solution but question aborted, assigning points to thanks Mutahir for his input :)
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