how to fix network issues with possible IP conflicts

the problem i'm trying to figure is out is why REC-PC-1 and FRONT-DESK-PC won't connect to the network after i have assigned fixed IPS. I have 2 x routers, a talktalk technicolor router for my IP phones and the 2nd is a netgear router for my network PCS and printers

If i set the DHCP to ON on both routers I can get FRONT-DESK PC online but not connected to the network. message is cable unplugged.

REC-1-PC could get online and on the network previously but now it says unrecognised network. no matter if i have both routers as DHCP ON

the technicolor router cannot be set to DHCP OFF - If i choose custom set up the router will not authenticate so i have to leave DHCP on


i've tried swapping the DSL lines, deleting all devices and setting up again on the netgear router table and having only 1 router on for phones and PCs together and there is always some connection problem or network problem

i've checked the ethernet points with different cables and sometimes its shows the connection is fine and then other days it shows unknown network. i also have a 48 port switch with a fixed IP assigned to the PCs router

192.168.0.3 FRONT-DESK-PC
192.168.0.5 REC-PC-2
192.168.0.4 REC-PC-1
192.168.0.239 48-PORT-SWITCH

FRONT-DESK-PC is running windows XP
REC-PC-1 cannot access the internal network or reach internet.
REC-PC-2 can reach network and internet

if i Ping the PCs i get packets sent 4, packets reached 4 , packets lost 0

any advice on how to get past the unrecognized network message and have all 3 x pcs seeing each other on the network would be really appreciated!

Thanks

Jamie

Ok you can't have both routers handing out IP's through DHCP, you absolutely must turn off DHCP on one of those routers or it won't work. It's usually best to turn off DHCP on the secondary router. Both routers will be using the same gateway address from the router which is the DHCP server. It has to be this way if you want everything to work.

As for the static IP's, you must assign IP's which are outside the range of DHCP IP's that the router is handing out, otherwise you will have an IP conflict.

So if the router's DHCP uses a range of 100 IP's from 192.168.0.2-192.168.0.101, then you must use IP's starting from 192.168.0.102 etc., or you can change the range of IP's that the router is using, either way you can't use IP's which can be included in the DHCP range.

Hi

I have the 2 x routers running on separate adsl broadband lines.

The netgear router is 192.168.0.1 and the technicolor router is 192.168.1.254

If these 2 x routers are on different subnets would the dhcp being on turned on for the technicolor affect the range I use for the fixed ips on the netgear router?

Hi

I have the 2 x routers running on separate adsl broadband lines.

The netgear router is 192.168.0.1 and the technicolor router is 192.168.1.254

If these 2 x routers are on different subnets would the dhcp being on turned on for the technicolor affect the range I use for the fixed ips on the netgear router?

jcwood said:

Hi

I have the 2 x routers running on separate adsl broadband lines.

The netgear router is 192.168.0.1 and the technicolor router is 192.168.1.254

If these 2 x routers are on different subnets would the dhcp being on turned on for the technicolor affect the range I use for the fixed ips on the netgear router?

Two different lines would create two different networks so one shouldn't effect the other.

Most likely the static IP's weren't set up correctly. If you want all PC's to see each other then put them on the same subnet, same router, same default gateway etc.

Hi Josh

I tried pinging both IP address and web address but was unreachable

I tried the tracert 173.194.66.94 but this did not show any results.

at the moment the default gateway shows blank and the IP address when trying to get off the DHCP shows 169. etc

i have had more PCS drop off the network now so the problem is getting worse.

Thanks

Jamie

Hi

There are 2 x ADSL lines connected to the routers. (tecnicolor and netgear)

Technicolor is on subnet 192.168.1.254 - router set up has DHCP on in its basic settings. When I try to set it up on custom settings the router fails to authenticate and cannot link to the wired network

Netgear is on subnet 192.168.0.1 - router can have DHCP turned off or on quite easily but when i try altering the settings the technicolor router fails.

These are both connected by a 48 Port Switch as a bridging connection - i think there is a setting I can change on here that allows DHCP on or off, it is currently on static IP address 192.168.0.239 and default gateway 192.168.0.1

the DNS servers for the netgear router are set to receive off ISP and are blanked out

subnet masks are both 255.255.255.0