ICS via NAT with ethernet crossover cable

[hawat.thufir]

the hardware:

1.) internal ethernet NIC with an RJ-45 socket
2.) external 802.11b USB NIC
3.) PAP2 <http://www.linksys.com/products/product.asp?prid=651&scid=38>
4.) one computer
5.) one telephone (plugged into the PAP2)

Linksys support says to connect the internal ethernet NIC with the PAP2
using an ethernet crossover cable. They also say the don't offer any
support beyond that. Digital Voice, <http://www.digitalvoice.ca/>,
also offers no support for this setup.

I'm looking at <http://www.webopedia.com/TERM/N/NAT.html> but haven't
found an applicable how-to. I'm not sharing a wireless connection
between two computers, but configuring the computer to act as a
"router" between the two NIC's to enable the PAP2 for VOIP.

Once I buy ($$$$) the crossover cable, how do I enable ICS, please?

thanks,

Thufir

 

[David H. Lipman]

| the hardware:

| 1.) internal ethernet NIC with an RJ-45 socket
| 2.) external 802.11b USB NIC
| 3.) PAP2 <http://www.linksys.com/products/product.asp?prid=651&scid=38>
| 4.) one computer
| 5.) one telephone (plugged into the PAP2)

| Linksys support says to connect the internal ethernet NIC with the PAP2
| using an ethernet crossover cable. They also say the don't offer any
| support beyond that. Digital Voice, <http://www.digitalvoice.ca/>,
| also offers no support for this setup.

| I'm looking at <http://www.webopedia.com/TERM/N/NAT.html> but haven't
| found an applicable how-to. I'm not sharing a wireless connection
| between two computers, but configuring the computer to act as a
| "router" between the two NIC's to enable the PAP2 for VOIP.

| Once I buy ($$$$) the crossover cable, how do I enable ICS, please?

| thanks,

| Thufir



You don't want to use ICS !

If you are using Cable or DSL, get a Cable/DSL Router such as the Linksys BEFSR41. With it
you can use standard cat-5 twisted pair networking cable. There are many benefits to using
this device such as a Simplistic FireWall and a 4-port 10/100Mb/s Ethernet switch and allow
sharing the one ISP WAN address with up to 253 LAN nodes.

This way you won't need to have the overhead of ISC nor *any* ISP provided software
especially if you are on DSL via PPPoE as the Router, not a PC, will make the PPPoE
connection.

As always, I suggest blocking both TCP and UDP ports 135 ~ 139 and 445 on *any* SOHO Router.

 

[Herb Martin]

How you connect the machines (e.g., crossver cable)
is irrelevant to ICS and NAT.

the hardware:
1.) internal ethernet NIC with an RJ-45 socket
2.) external 802.11b USB NIC
3.) PAP2 <http://www.linksys.com/products/product.asp?prid=651&scid=38>
4.) one computer
5.) one telephone (plugged into the PAP2)

Linksys support says to connect the internal ethernet NIC with the PAP2
using an ethernet crossover cable. They also say the don't offer any
support beyond that. Digital Voice, <http://www.digitalvoice.ca/>,
also offers no support for this setup.

Ok, can you ping the PAP2 from the computer?

What does the computer "Ipconfig /all" show?

(Paste it in here rather than trying to type it in.)

I'm looking at <http://www.webopedia.com/TERM/N/NAT.html> but haven't
found an applicable how-to. I'm not sharing a wireless connection
between two computers, but configuring the computer to act as a
"router" between the two NIC's to enable the PAP2 for VOIP.

ICS and NAT have nother to do with this since
you are using the PAP2 for those functions and
the computer is merely a network client node.

Once I buy ($$$$) the crossover cable, how do I enable ICS, please?

It's less than $10 and you can buy a hub instead
for less than $20 plus $5 for the (2) cables (which
you may already have.)

 

[hawat.thufir]

David H. Lipman wrote:
[..]

You don't want to use ICS !

If you are using Cable or DSL, get a Cable/DSL Router such as

[..]

Thank you for the reply. My landlord has a Cable modem to which an
802.11b router is connected. I connect to the router (and internet)
with an external 802.11b USB NIC. The router and cable modem are
inacessable for me...?

The PAP2 is then connected to the internal ethernet NIC with a regular
RJ-45 ethernet cable. The support guy at Linksys said to use a
crossover cable for that.

Sorry if I wasn't clear. Do you still recomend a router? The two
NIC's need to "talk" to each other, I believe.


thanks,

Thufir

 

[hawat.thufir]

How you connect the machines (e.g., crossver cable)
is irrelevant to ICS and NAT.

[..]
That's good to know.

Ok, can you ping the PAP2 from the computer?

The ethernet NIC isn't working, I don't have an IP to ping for the
PAP2.

What does the computer "Ipconfig /all" show?

[..]

The PCI ethernet adapter is "disconnected"

C:\>
C:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : arrakis
Primary DNS Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection 2:

Media State . . . . . . . . . . . : Cable Disconnected
Description . . . . . . . . . . . : SiS 900 PCI Fast Ethernet
Adapter
Physical Address. . . . . . . . . : 00-0A-E6-A0-24-27

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : SMC EZ Connect Wireless
USB Adapter
(SMC2662W)
Physical Address. . . . . . . . . : 00-04-E2-A9-F8-BF
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.2.139
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1
DHCP Server . . . . . . . . . . . : 192.168.2.1
DNS Servers . . . . . . . . . . . : 192.168.2.1
Lease Obtained. . . . . . . . . . : Thursday, March 03, 2005
10:28:13 AM

Lease Expires . . . . . . . . . . : Thursday, March 10, 2005
9:18:51 AM

C:\>

It's less than $10 and you can buy a hub instead
for less than $20 plus $5 for the (2) cables (which
you may already have.)

[..]

I'll shop around, thanks. If those were US prices, have to account for
Canadian exchange rate, BTW.


thanks,

Thufir

 

[Doug Sherman [MVP]]

To enable ICS, right click on My Network Places and select Properties.
Right click on the Local Area Connection for the 802.11b USB NIC and select
Properties. Click the Sharing tab and check the box for Enable Internet
Connection Sharing for this connection.

However, what does your 802.11b USB NIC connect to? If you are using a
wireless router, the PAP2 should be connected to an RJ45 port on that
device, and you do not need ICS.

Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

 

[hawat.thufir]

Doug Sherman [MVP] wrote:
[..]

However, what does your 802.11b USB NIC connect to? If you are using a
wireless router, the PAP2 should be connected to an RJ45 port on that
device, and you do not need ICS.

[..]

telephone connects to the PAP2. the PAP2 connects to an internal
ethernet NIC. The 802.11b USB NIC connects wirelessly to the 802.11b
router.

from advice here (and from linksys) there needs to a hub between the
PAP2, or a crossover cable needs to replace the regular ethernet cable.

the PAP2 can't connect to the router because the router is too far
away. Hence the ICS?


thanks,

-Thufir

 

[Doug Sherman [MVP]]

Your solutions are:

1. Best - extend the phone lines and use a short ethnet cable to connect
the PAP2 to the router; OR get a long ethnet cable. Don't know what "the
router is too far
away" means if you are close enough to get adequate performance over
802.11b.

2. 2nd Best - use a crossover cable (or standard cable and hub/switch) to
connect the PAP2 to the ethernet NIC on the computer. Do NOT enable ICS -
edit the registry to enable routing. This will work provided you can enter
a static route on the router pointing to the subnet on which the computer
and PAP2 device reside. If you cannot do this, then:

3. 3rd Best - Use ICS. The problem with this is that ICS provides Network
Address Translation (NAT) and your router also provides NAT. When you
double NAT, sometimes it works fine and sometimes ............

4. Also, there are such things as ethernet to wireless devices - ie. an
adapter which plugs into an RJ45 jack and provides 802.11x wireless
cabability. Such a device may (or may not) work with the PAP2 and allow it
to connect wirelessly to the router. eg:
http://www.jr.com/JRProductPage.process?Product_Code=BKN+F5D7330&JRSource=google.datafeed



Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

Doug Sherman [MVP] wrote:
[..]

However, what does your 802.11b USB NIC connect to? If you are using a
wireless router, the PAP2 should be connected to an RJ45 port on that
device, and you do not need ICS.

[..]

telephone connects to the PAP2. the PAP2 connects to an internal
ethernet NIC. The 802.11b USB NIC connects wirelessly to the 802.11b
router.

from advice here (and from linksys) there needs to a hub between the
PAP2, or a crossover cable needs to replace the regular ethernet cable.

the PAP2 can't connect to the router because the router is too far
away. Hence the ICS?


thanks,

-Thufir

 

[hawat.thufir]

Your solutions are:

1. Best - extend the phone lines and use a short ethnet cable to connect
the PAP2 to the router; OR get a long ethnet cable. Don't know what "the
router is too far
away" means if you are close enough to get adequate performance over
802.11b.

I *should've* said it'd involve long ethernet cables, which the Mrs.
Landlord doesn't want, or it'd involve drilling holes in stuff, which
Mr. Landlord & Mrs. Landlord don't want

2. 2nd Best - use a crossover cable (or standard cable and hub/switch) to
connect the PAP2 to the ethernet NIC on the computer. Do NOT enable ICS -
edit the registry to enable routing. This will work provided you can enter
a static route on the router pointing to the subnet on which the computer
and PAP2 device reside. If you cannot do this, then:

huh. I bought the crossover cable, plugged it in, enabled ICS, took a
nap, and everything works...then read your message here saying not to
do that!

3. 3rd Best - Use ICS. The problem with this is that ICS provides Network
Address Translation (NAT) and your router also provides NAT. When you
double NAT, sometimes it works fine and sometimes ............

Hmm. I'd like to know what's going and why it works. This setup, with
the PAP2, is just a trial run. <http://www.digitalvoice.ca/> is too
expensive for me, I'm just taking advantage of free month and free use
of the PAP2 for that period. I'll be switching to
<http://www.peopleline.net/> by April first.

The "point" of this was to try VOIP out for free and make it work
before plunking down any cash. (I can return the crossover cable if I
don't find a longterm use for it.) I'll have to do some research into
NAT, it'd suck to monkey with this once I start paying monthly.

any suggestions as to where to start?

Of course, thank you for the help!


-Thufir

 

[Doug Sherman [MVP]]

I did not say not to do that. In fact, I told you exactly how to enable ICS
in my first post. I said that for your 2nd best alternative - straight
routing, do not enable ICS. I said ICS was your 3rd best solution because
double NAT sometimes does not work. Obviously, it is working fine in your
case; so it would seem that your problem is solved.

Good luck.

Doug Sherman
MCSE Win2k/NT4.0, MCSA, MCP+I, MVP

 

[hawat.thufir]

I did not say not to do that. In fact, I told you exactly how to enable ICS
in my first post. I said that for your 2nd best alternative - straight
routing, do not enable ICS. I said ICS was your 3rd best solution because
double NAT sometimes does not work. Obviously, it is working fine in your
case; so it would seem that your problem is solved.

Good luck.

you're right, I was just on auto-pilot. also, I never looked into
editing the registry.


thanks,

Thufir

 

[hawat.thufir]

Doug Sherman [MVP] wrote:
[..]

2. 2nd Best - use a crossover cable (or standard cable and hub/switch) to
connect the PAP2 to the ethernet NIC on the computer. Do NOT enable ICS -
edit the registry to enable routing. This will work provided you can enter
a static route on the router pointing to the subnet on which the computer
and PAP2 device reside.

[..]
C:\>ipconfig /all

Windows 2000 IP Configuration

Host Name . . . . . . . . . . . . : arrakis
Primary DNS Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Broadcast
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : No

Ethernet adapter Local Area Connection 6:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Linksys Wireless-B USB
Network Adapter v4.0
Physical Address. . . . . . . . . : 00-0F-66-79-41-F7
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.2.150
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1
DHCP Server . . . . . . . . . . . : 192.168.2.1
DNS Servers . . . . . . . . . . . : 192.168.2.1
Lease Obtained. . . . . . . . . . : Saturday, March 12, 2005
5:47:14 AM
Lease Expires . . . . . . . . . . : Saturday, March 19, 2005
3:58:52 AM

Ethernet adapter Local Area Connection 2:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : SiS 900 PCI Fast Ethernet
Adapter
Physical Address. . . . . . . . . : 00-0A-E6-A0-24-27
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.0.1
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DNS Servers . . . . . . . . . . . :

C:\>

there's a hub connected to Local Area Connection 2, to which the PAP2
telephone adapter's connected. I'm searching the MS knowledge base for
info on editing the registry to enable routing; so far no luck

-Thufir

 

[hawat.thufir]

Doug Sherman [MVP] wrote:
[..]

4. Also, there are such things as ethernet to wireless devices - ie. an
adapter which plugs into an RJ45 jack and provides 802.11x wireless
cabability. Such a device may (or may not) work with the PAP2 and allow it
to connect wirelessly to the router. eg:

http://www.jr.com/JRProductPage.process?Product_Code=BKN+F5D7330&JRSource=google.datafeed
[..]
I think I might get this one:
<http://www.asus.com/products/communication/wireless/wl-300/overview.htm>,
but I'm looking into this.

thanks,

Thufir