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ADSL router's WAN PORT & LAN PORT connected to one broadcast domain

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http://serverfault.com – In our MD's house, we have fibre optic connection given by the ISP upto Distribution box inside the house where the fibre optic cable is connected to HUAWEI-ECHOLFIE HG865 terminal .From the RJ 45 port in that device , the ethernet cable goes to the DLINK 8 port switch. All the 8 ports are connected with ethernet cables to 8 rooms going concealed through the wall. Our ISP person tested the connection by connecting one patch cable (from the DLINK SWITCH via the wall socket)to the WAN port of LINKSYS WRT300N wireless router and connecting other ethernet cable from the lan port of the router to (HowTos)

xskl's picture
Submitted by xskl on 02/22/2012 – Made popular on 02/22/2012

Stories similar to ADSL router's WAN PORT & LAN PORT connected to one broadcast domain

I get my internet from a cable modem thru Comcast. My house has a smart panel with 8 LAN ports, each going to the 8 rooms in my house. The cable modem links directly to an 8-port hub which allows 8 lines to feed each of the 8 ports in the house's smart panel... so every room has a live ethernet wall jack.

In room #1, I have a netgear wifi router connected to the wall jack.

Home Net Topology

ISP/WAN > Modem > Router (linksys) >Router(CISCO 851W) > (serial cable) 2008 R2

I have the loopback cable connected from my server to the CISCO router. The router is connected to the router in the office with a crossover cable. It is connected to Lan port 4 (Linksys) and the cable is plugged in to the WAN port(CISCO).

I have a netcomm nb16vw router which supports cable, adsl2+ and 3g internet. The router has 4 ports.

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Currently, I have a network setup that kind of duct-taped together.

I recently bought a noname wireless router (abit 5002), I configured it and everything works perfectly, except that i can't connect to the internet from linux using the ethernet cable. My phone and laptop detect and connect to it flawlessly, also right now im connected using the ethernet cable from Windows 7.

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Environment:

I have a Brother 7360N Network Printer connected to a TPLINK Router over an Ethernet cable.

My desktop, running Windows 8 is connected to the TPLINK Router over an Ethernet cable. A ROKU device is connected over Ethernet.

The TPLINK Router is setup as "Client Bridge (Routed)" wirelessly connected to my other router, a Linksys 3000. Both routers are on DD-WRT.

I have a Cisco 2950 switch which has one of its ports connected to an Internet router provided by my ISP; I have no access to the router configuration, but I manage the switch.

If I leave all switch ports with their default setup (auto-negotiation of speed and duplex mode), this link always connects at 100 MBit/s, but in half-duplex mode.

I've tried replacing the cable, and also moving the link

after doing a lot of research I am even more confused about what the best setup would be for my new house and I would appreciate any help.

Thanks Tim

My default situation is this:

A cable modem let's me access the web.

I would like to tcpdump all traffic that my router does when it makes a firmware update.

So I have taken a HP ProCurve 1800-8G switch and mirrored port 7 to port 8.

I have connected:

Internet connection in port 6 routers WAN port in port 7 Linux host running tcpdump in port 8

I suppose the router have a dhcp client on the WAN interface.

However I don't see any activity.