[PLUG] Network confusion

Bill Barry bill at billbarry.org
Sun Feb 23 20:56:46 UTC 2014


On Sun, Feb 23, 2014 at 12:12 PM, John Jason Jordan <johnxj at comcast.net> wrote:
> I have a new phone (Samsung Galaxy Note 3), so I needed to get it
> working with my Linksys WRT54G. The Linksys is connected to the main
> router (D-Link), as are two switches for ethernet connections. The only
> thing I use the Linksys for is the phone; everthing else is connected
> via ethernet (laptop, desktop, HDHomeRun).
>
> When I tried to connect the phone to the Linksys it can't get a
> connection. Neither can myt laptop. From Firefox I can get into the
> D-Link (192.168.0.1), but Firefox cannot connect to the Linksys
> (192.168.0.179).
>
> The reservations in the D-Link are:
>
>         Linksys         00:0F:66:09:8C:BF 192.168.0.179
>         Desktop                 00:1A:92:E4:39:68       192.168.0.155
>         HDHR-           00:18:DD:03:D3:9F 192.168.0.135
>         Laptop          00:23:54:8C:65:20       192.168.0.126
>
> Also, I actually have two wrt54G routers, so I swapped them out, but no
> change.
>
> >From the command line on the laptop:
>
> ifconfig
> eth0   Link encap:Ethernet  HWaddr 00:90:f5:ef:f2:59
>           UP BROADCAST MULTICAST  MTU:1500  Metric:1
>           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> eth1   Link encap:Ethernet  HWaddr 00:23:54:8c:65:20
>           inet addr:192.168.0.126  Bcast:192.168.0.255
> Mask:255.255.255.0 inet6 addr: fe80::223:54ff:fe8c:6520/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:49218553 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:64499368 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:6638232415 (6.6 GB)  TX bytes:54929998969 (54.9 GB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>           RX packets:648109 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:648109 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:57506452 (57.5 MB)  TX bytes:57506452 (57.5 MB)
>
> The results from ifconfig above are baffling. Why are there two
> ethernets? And I assume that the missing wlan0 is because something is
> wrong with the Linksys configuration. When I disconnect the cable
> between the D-Link and the Linksys the lights on both go out, so the
> connection must be OK.
>
> Consider that I am an idiot when it comes to networking. Any suggestions
> welcome.

How is the Linksys connected to the D-Link?  You should have a wire
going from one of the LAN ports on the Linksys to one of the LAN ports
on the D-Link.
You do not want a wire going from the WAN port on the Linksys to the
D-Link. The WAN port on the Linksys should not have anything connected
to it (footnote).

(footnote unless you have purposely bridged the WAN port  so that it
can act as a LAN port)

Bill


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