Member Avatar for Braga_ESI

Hello, I'm having a problem. you see, I'm living in a house that has a internet conection thrue a computer(PC1) that has a ADSL modem. só this computer is linked to standard switch with 8 ports. until now thereś no problem.
the problem: I byed a new PC and a router NTech 4-port, so I could have internet on the two computers in my room(PC7 & PC8). but the router won't distribute internet or lan. :rolleyes:

I have this configuration:
PC1:
ip
submask
getway

PC7:
ip
submask
getway
DNS

PC8:
ip
submask
getway
DNS

I tryed to enter the router and change it's ip to some other ip and change the DNS of the PC7 and PC8 to that ip. :o Didn't work!

I attached a image to help out... :cheesy:

I don know what to do...

Untitled-1.gif 11.81 KB
  • 5 Contributors
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  • Latest Post Latest Post by AJR1415

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Brief summary and a clear plan: the problem is almost always an addressing/DHCP mismatch when a router is dropped into an existing flat switch. has a host acting as the Internet gateway and a separate four‑port router was added downstream; the replies from , and point at two sensible approaches. One keeps a single flat LAN (simpler) and the other creates a separate routed LAN (works too but needs attention to NAT and routes).

Option 1 — make the NTech behave like a switch / access point (preferred if one single LAN is wanted):

  • Physically use a LAN port on the NTech to connect to the house switch (do not use the router WAN port).
  • Give the NTech a unique, unused LAN address on the existing LAN (so the admin page stays reachable) and turn off the NTech’s DHCP server and firewall.
  • Devices plugged into the NTech will get addresses from the existing LAN DHCP and join the same network as the rest of the house. This avoids extra routing and is simplest for file/print sharing.

Option 2 — keep the NTech as a router (separate subnet):

  • Plug the router WAN into the house switch, let or set the WAN side to an address on the main LAN, enable NAT on the NTech, and let its LAN side use a different private subnet with its own DHCP.
  • This isolates the two groups but avoids changing the gateway host. Be aware double NAT can break port forwards, some VPNs and peer services; if avoiding NAT is required, a static route must be added on the gateway host.

Useful commands and checks (replace placeholders):

ipconfig /all
ping <router-admin-ip>
route -p add <secondary-subnet> mask <netmask> <router-wan-ip>
arp -a

Quick troubleshooting checklist: confirm link LEDs and correct physical port (LAN vs WAN), ensure only one DHCP server per broadcast domain, remove any duplicate static addresses, try a factory reset and reconfigure, and test with one PC wired directly to the NTech before adding more machines. The posts by and already point to these options; pick Option 1 for simplicity or Option 2 if true subnet isolation is required.

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Member Avatar for w1r3sp33d

OK unless you have turned off routing somehow you must have different networks on each interface of a router. Since four of those ports are really just switchports off an internal interface that router should have two networks; 192.168.0.X (.100 for my example) on the "outside" and something else like 192.168.1.X on the inside, let's say .1 for the router.

Router will have to do NAT, use a default route to , and should provide DHCP to the "inside" area.

PC7 and PC8 will need an ip on the 192.168.1.X side, SM , DG, DNS will be still. The PC1 will need a static route pointing the network to (router)

This should be enough to get you started in the right direction, if anyone notices something I missed please post it as I have to get to work. A dual NAT setup sometimes causes some weird problems, occasionally depending on the limitations of the routers it just doesn't work.

A final question what OS and version are you running on PC1?

Member Avatar for Braga_ESI

I'm using windows XP2, thanks a lot, I'll try to do what you sayed...

Thanks, once more.

Member Avatar for ulul

ulul cra ulo kamali set up mo internet muna tapos router tapos switch

Member Avatar for mrjbrunet

you're addressing scheme is all wrong ...first of all routers divide networks...thats why they're so good in terms of security...what i'm getting at is you have the same addressing scheme right acroos the board when in my view you have 3 different network 1)everything attached to the switch...2)a network between the switch and the router and 3) everything on the other side of the router...to add to your problem you didn't address the router nor the switch>>>these devices need not only an address but a default gateway(which would be the next device...not the router!

Member Avatar for AJR1415

All of your IP settings are the same as the gateway and dns...it sounds like you are entering static IP addys.On each computer Under network settings click on your network settings, click on your network, TCP/IP settings, then click on automatically obtain an IP. Your Router/Switch comes configured with an addy of Do not assign this to your computers. this will work...any questions, repost

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