Re: 2 wire DSL
- From: Luke Militello <luke@xxxxxxxxxxxxxxxxx>
- Date: Sun, 07 Dec 2008 00:18:51 -0500
Leonard Chatagnier wrote:
--- On Sat, 12/6/08, Luke Militello <luke@xxxxxxxxxxxxxxxxx> wrote:
BIG SNIP
Sounds to me the problem is a double NAT. From what I amHonestly, Luke, I have no idea what you mean at the beginning
reading... is
this how your network is setup?
INET <----> 2WIRE-DSL <----> WIFI-RTR
<----> END-USERS
Most DSL routers do NAT by default, however lack the option
of WiFi
capabilities so most users opt for a secondary router. If
your network
is like the one above, then your WiFi router is
"NAT'ing" down to one IP
address on the "DSL network". Although double
NAT is bad for port
forwarding and I wouldn't recommend it, it can be done,
however you must
be sure the two private ranges are not conflicting. In
other words, if
the device doing NAT sees the same network on each side, it
will get
confused. If this is the case, do something like this.
INET <----> 2WIRE-DSL <--(192.168.1.0/24)-->
WIFI-RTR
<--(192.168.2.0/24)--> END-USERS
You will still have double NAT in place, but this should
allow
connectivity to 192.168.1.254 (your DSL box). Because this
IP address
only exists on one side, your WiFi router would treat it
like a "public"
IP and translate it just fine. Feel free to use any of
these networks
as they are all reserved for private use.
10.0.0.0/8 (10.0.0.0-10.255.255.255)
172.16.0.0/12 (172.16.0.0-172.31.255.255)
192.168.0.0/16 (192.168.0.0-192.168.255.255)
However, the best approach would be to directly connect one
PC to your
DSL box (via DHCP), login and disable NAT, connect your
WiFi router back
up, reboot both DSL and WiFi router (in that order), then
login to your
WiFi router and verify for its public address that it does
NOT have an
IP address which falls in the ranges given above.
One more thing to mention, most DSL routers will
automagically disable
NAT once they see a connection to the WAN/DSL/Internet
side. In this
case, your network should be fine. Simply disconnect the
DSL box from
the phone line, reboot it and you should get connectivity
to
192.168.1.254 for management purposes. Once plugged back
in to the
phone line, connectivity to 192.168.1.254 will go away.
However, to do
this, I would plug a PC directly into the DSL box to avoid
network
confusion if you WiFi router uses the same network as your
DSL box (as
stated above).
Hope this helps, if not, please enlighten me on your
network setup as
there are too many posts for me to trace back on ;)
of your reply so let me try to explain. Two machine LAN. Outside
world connected to 2wire DSL router/ modem combo. Router wired
to new Gateway Intrepid machine which is now in shop so I have no
hard wired maching in place currently. The other machine in anther
room has a syslink wmp54g wifi card installed and a NIC also but
not connected to anything. The eth0 interface is setup with same
IP as the wifi.
I don't know about NAt either and If I understand what you said
I don't have a separate router and modem. They are all in one box,
a 2wire 1701hg router/modem combo. I've only had experience
with this one router.modem combo. it seem that you refer to
each separately above, but I'm not sure. In any case, I'm about
to move the wireless machine and hook it up directly to the
router/modem(after unplugging it to reset) and start the machine
back up under DHCP to see if I can connect to 192.168.1.254 and
access the 2wire setup page again. Hope this explains a liitle. I
know what you mean, I've been answering replyies on this issue all
day and haven't had time to move the machine or switch back to DHCP
yet but will do so now. Thanks for you input. Sorry I didn't uderstand
most of it but I did say I was a network idiot in an earlier post.
Leonard Chatagnier
lenc5570@xxxxxxxxxxxxx
No, problem, that does clear some stuff up so ignore the bulk of my last
reply. So to clarify, you have (right now) one PC connected via
wireless to your 2Wire DSL. You can connect to the Internet just fine,
but cannot connect to the 2Wire? Try this command...
[luke@Ignignokt ~]$ netstat -nr
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt
Iface
10.188.39.192 0.0.0.0 255.255.255.192 U 0 0
0 eth0 <-- My local network.
169.254.0.0 0.0.0.0 255.255.0.0 U 0 0
0 eth0 <-- If you have this as well, ignore it.
0.0.0.0 10.188.39.193 0.0.0.0 UG 0 0
0 eth0 <-- My default gateway.
See where I have "10.188.39.193"? That is my default gateway hence the
"G" flag. In your case, is yours 192.168.1.254? If it is something
different, that is most likely the IP address of your 2Wire. Try
connecting to whatever IP address is listed there in Firefox.
--
Luke J Militello, CCNA
Network Engineer
Technical Operations
Charter Communications
Cisco Certified Network Associate
Michigan Technological University, BS
Computer Network & System Administration
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