Problems on networking

[wishmegood]

Hi, i have a network connection as shown below:
http://i72.photobucket.com/albums/i171/fhlse/1-1.jpg
Now i have problems on PC A, PC B, PC C, PC D and PC E that they could hardly get connected to internet, though only one or two computers access to internet in a time to check email. Is it because the connection is too complicated?
Any inputs are very much appreciated.

[greEd]

Whats the rated speed of your ADSL connection?

Do the PC's connected to switch 1 experience the same issue?

[wishmegood]

greEd, thanks for your input.

The rated speed of the ADSL connection is 2Mbps / 512Kbps.

As the client doesn't want the computers linked to switch 1 to get connected with internet, didn't check whether they have same issue.

Thanks again for your advices.

[sundar_ramnath]

hi
tell how your both routers are connected. is it a lan to wan connection or lan to lan connection. if it's a lan to lan connection the second router will act as a switch. so PC D and PC E will not go online

[YeOldeStonecat]

DHCP disabled on router 2?
Is the LAN IP address of router 2 unique?
...
Ideally, you want to evenly distribute your switches..not have one cascade into another which cascades into yet another.

Have one top level switch with servers and internet, and uplink other switches individually into that one.

[wishmegood]

sundar_ramnath:
thanks for your reply, i am not sure whether they are connected in lan to lan or lan to wan connection. The connection is i plug one end of a cable to one of 4 ports of router modem, the other end is connector to one of 4 ports of router too...no uplink or downlink connection...so i don't know they are grouped with which type of connection...
YeOldeStonecat:
thanks for your reply too. Well, i've disabled the DHCP for router modem (the first one), and yet the second one i didn't check its settings, as well the LAN IP of router 2 i still have no idea how it is set.

thanks again for your advices! ;)