Cable Forum - View Single Post - Problems connecting via a router,,,,heres a workaround solution !

Ubermik · 14-01-2007, 01:37

Garry, the reason for that is twofold

The first part of the reason, why the router doesnt seem to even try and send packets is because its a layer 3 router

Either it will just decide to not bother routing any LAN traffic to the modem because the gateway is wrong or the actual act of routing the packets itself will fail due to not having a valid destination on each attempt although the effects will be identical in that no traffic will get from the lan to the WAN side of the router, the only real difference being that one will be due to each individual packet being discarded and the other will be due to it simply ceasing to route due to the lack of a valid gateway which will depend on how the firmware is written for the router

The reason it WILL work when connected directly to the modem is because the modem isnt a router so it wont wrap any routing information around the packets, that will instead be done by Telewests routers who dont rely on the packets routing information for the gateway but which use their own routing tables which will contain the real gateway for each subnet meaning it will carry on its way merrily

---------- Post added at 01:37 ---------- Previous post was at 01:34 ----------

So basically the information the router and PC get are identical, but the router being a router is what means it doesnt work

If you connect the PC directly to the modem and then do an ipconfig or ipconfig /all you will see the information thats tendered by the DHCP server is still just as wrong and will be identical to that the router obtains when its connected between the PC and the modem

I hope that clears it up

Mike

14-01-2007, 01:37	#11
Ubermik Inactive Join Date: Jan 2007 Posts: 15	Re: Problems connecting via a router,,,,heres the workaround solution ! Garry, the reason for that is twofold The first part of the reason, why the router doesnt seem to even try and send packets is because its a layer 3 router Either it will just decide to not bother routing any LAN traffic to the modem because the gateway is wrong or the actual act of routing the packets itself will fail due to not having a valid destination on each attempt although the effects will be identical in that no traffic will get from the lan to the WAN side of the router, the only real difference being that one will be due to each individual packet being discarded and the other will be due to it simply ceasing to route due to the lack of a valid gateway which will depend on how the firmware is written for the router The reason it WILL work when connected directly to the modem is because the modem isnt a router so it wont wrap any routing information around the packets, that will instead be done by Telewests routers who dont rely on the packets routing information for the gateway but which use their own routing tables which will contain the real gateway for each subnet meaning it will carry on its way merrily ---------- Post added at 01:37 ---------- Previous post was at 01:34 ---------- So basically the information the router and PC get are identical, but the router being a router is what means it doesnt work If you connect the PC directly to the modem and then do an ipconfig or ipconfig /all you will see the information thats tendered by the DHCP server is still just as wrong and will be identical to that the router obtains when its connected between the PC and the modem I hope that clears it up Mike