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shorun

join:2012-09-03
94001

[General] Correct Cisco WIC for SBC DSL?

Hey all. I am in the SF Bay Area and looking to replace my 6 year old Siemens DSL modem with a Cisco WIC in an 1841.

I've heard the ADSL WICs are flaky in general with SBC and more so with PPPoE (this is a residential connection with a dynamic IP).

It's also rumored that everyone will be forced to switch to U-Verse, and then I would presumably need to buy a different WIC.

Questions:
1.) Has anyone here successfully used an ASDL WIC with PPPoE & SBC / AT&T?
2.) What DSLAM does SBC/AT&T currently use for traditional DSL? (such as Alcatel ASAM, Lucent Stinger, Cisco 6000)
3.) What DSLAM are they using for U-Verse?
4.) What WIC will be compatible with the U-Verse DSLAM?

If nobody has specifics I'd still like to discuss options for a DSL modem that is transparent and doesn't filter packets or perform NAT - even better if it has only a CLI and no web interface.

Thanks!


d_l
Barsoom
Premium,MVM
join:2002-12-08
Reno, NV
kudos:7
Why not try to find a used Seimens Speedstream 4100, 4100b or 5100b from eBay or at a Goodwill store as a replacement. They are usually cheap. They are the best modems ever made for AT&T DSL. Often when they seem to be "dead" or flaky, only their wall wart power supply needs to be replaced.

If your area is forced to switch to Uverse, you won't have a big investment in an incompatible modem.
--
TCE Weather -- Mt. Rose Cam

public

join:2002-01-19
Santa Clara, CA
reply to shorun
said by shorun:

If nobody has specifics I'd still like to discuss options for a DSL modem that is transparent and doesn't filter packets or perform NAT - even better if it has only a CLI and no web interface.

Netopia/Motorola 3347N is another possibility.
You can ignore the web setup an use only telnet cli.
In bridge mode it just passes packets.
I have extra if you are interested.

shorun

join:2012-09-03
94001
Hey, thanks guys, good call. I got a speedstream 5100 bridge. You can't even log into the web interface without manually creating an ARP entry. So far it appears to be completely transparent, and no more issues with being disconnected / having to reauthenticate. Perfect.

I was also able to get my ASA to grab an IP via PPPoE by using this:

interface Vlan2
nameif outside
security-level 0
pppoe client vpdn group sbcpppoe
ip address pppoe setroute

vpdn group sbcpppoe request dialout pppoe
vpdn group sbcpppoe localname me@sbcglobal.net
vpdn group sbcpppoe ppp authentication pap
vpdn username *****@sbcglobal.net password ***** store-local

Thank you for your help


d_l
Barsoom
Premium,MVM
join:2002-12-08
Reno, NV
kudos:7
reply to shorun
Glad it worked out for you. That sounds like you got a 5100a version. That's an OK modem, but they tended to run hotter than the later Speedstreams listed above because of an older chipset. So keep it well ventilated or it could fail.

You might keep an eye out for a cheap price on one of those other modems. The 5100a can make a good back up modem.
--
TCE Weather -- Mt. Rose Cam

public

join:2002-01-19
Santa Clara, CA
reply to shorun
said by shorun:

Hey, thanks guys, good call. I got a speedstream 5100 bridge. You can't even log into the web interface without manually creating an ARP entry.

Sadly that means no access to line parameters when there are sync issues.

shorun

join:2012-09-03
94001
Thanks for pissing on my parade! That is a good point - but I do have a Siemens 4100 I can plug in for troubleshooting

The 4100 gave me a bunch of problems though. When I would fire up certain games or run NMAP it would flip out and log me off. I'd have to power cycle my modem and firewall, and then go to the web interface and click "Connect". Huge pain... works fine now


d_l
Barsoom
Premium,MVM
join:2002-12-08
Reno, NV
kudos:7
The 4100 modems had problems with too many connections when the modem was handling the PPPoE. Certain online games expected to make more connections than the modem's limited NAT memory could handle and the modem would reboot.

The last available firmware update helped this problem some, but the real cure is to run the modem in bridged mode and let the router behind it handle the PPPoE encapsulation.
--
TCE Weather -- Mt. Rose Cam

public

join:2002-01-19
Santa Clara, CA
reply to shorun
said by shorun:

The 4100 gave me a bunch of problems though. When I would fire up certain games or run NMAP it would flip out and log me off. I'd have to power cycle my modem and firewall, and then go to the web interface and click "Connect". Huge pain... works fine now

Do not use ppp on the modem. Get one that has line statistics, put it in a bridge mode, and use one of many techniques to access it in front of the firewall.

shorun

join:2012-09-03
94001
reply to d_l
Ah - I had determined the problem to be too many Xlates / connections, but didn't know you could put it in bridged mode. I'll try that when my 5100 overheats. I actually found the 5100 in our ewaste closet at work, and I think there is a netopia floating around somewhere too.

Thank you for the insight on this.


d_l
Barsoom
Premium,MVM
join:2002-12-08
Reno, NV
kudos:7
reply to shorun
AT&T configured the 4100 and 4100b modems to have an ACK prioritization buffer and that reduced the NAT table memory. You could take an AT&T version modem and flash the generic 4100 firmware version onto it and you would have ample NAT table memory to play games when the modem made the PPPoE connection, but you lost the ACK prioritization.
--
TCE Weather -- Mt. Rose Cam


boethius
Boo-Yah
Premium
join:2002-01-28
Winters, CA
reply to shorun
I'm running the DSL WIC cards in 2800 series routers in two locations for a couple years and have had nary a problem. Not sure where you got the notion it was flaky and the speed seems as advertised to me.

They're not expensive and you can keep the whole setup internal to your router obviously.