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Maxo
Your tax dollars at work.
Premium Member
join:2002-11-04
Tallahassee, FL

Maxo to McSummation

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Re: Speedstream 5100b hardware configuration

As mentioned I have written up some FAQs for the modem:
»SBC DSL FAQ »How do I setup the 5100b to connect to the internet?
»SBC DSL FAQ »What are the lights and what do they mean?
»SBC DSL FAQ »How can I put the 5100b in bridge mode?
These should answer a number of your questions. I'm not really sure what the difference is between Bridge and Bridge with IP Pass Issuance. Hopefully someone else will clear this up. Even with the modem is bridge mode I don't see any reason why the GUI shouldn't still be accessible. I have the Zyxel 645M with Sprint and when it is bridged everything is still accessible (including line stats) except the connect and disconnect button.
As had been stated if you want to hook up a router your best bet is to just go ahead and bridge the modem. One issue that might come up is that (from what I've told) this modem Linksys routers both have an IP of 192.168.0.1 which will probably cause some problems.
Once thing of important note is if you need help connecting SBC will only provide tech support with the modem in PPPoE on board mode. This includes if you have bridged and are using XP/OSX PPPoE or Enternet 300. If you have problems connecting first unbridge the modem and try that way before calling in.

MyTechLife
Tech Guru
join:2001-01-17
Reno, NV

MyTechLife

Member

I had an issue with the new modem today. Using Windows98 with no router in the equation, I decided to do a firewall test at www.grc.com. The test failed with all ports closed, except for port 139 being open. The IP address was a public one in the 68.xxx.xxx.xxx range. After that I inadvertently hit the power switch on the modem and the DSL or Internet light wouldn't go steady green (the 2nd light from the right). It would flash green for a while then go dark. A few times I had a solid red on that light. While this was happening I checked winipcfg, and it showed the LAN adapter IP address as 192.168.0.64, with the gateway as 192.168.0.1

After rebooting the computer and modem a few times I clicked the SBC connection troubleshooter in the system tray, and finally the light on the modem went solid green again, and I was able to connect to the internet. Checking winipcfg again, the LAN adapter was back at a 68.xxx.xxx.xxx address with the gateway as one IP address off the LAN adapter address.

I thought that this new modem would act like a firewall, hiding the LAN adapter address from the internet. I confirmed that the setting was "PPP is on the modem". Why couldn't I connect to the internet when the modem was issuing 192.xxx.xxx.xxx address to the LAN adapter? How did it end up issuing a 68.xxx.xxx.xxx address to the modem? I was also expecting to find a "b" in the model number on the bottom of the modem ??

Flippant
So Much For Subtlety

join:2000-06-04
Katy, TX

Flippant

Ned,

Perhaps it would be better to post your specific problems to a new thread, this one is more on the general abilities of the modem not specific problems.

Thanks.

MyTechLife
Tech Guru
join:2001-01-17
Reno, NV

1 edit

MyTechLife

Member

Never mind, I found my answer in this post »Re: [Modem] Speedstream 5100b in this thread »[Modem] Speedstream 5100b

Also found more info here »help.sbcglobal.net/artic ··· tem=3411

I think my problem was that I had an open browser window that was trying to hold onto the 192.168.0.1 IP, and wouldn't let the public IP (68.xxx.xxx.xxx) be set on the LAN. Guess we'll still have to use 3rd party firewall software for pre-XP computers.

I'll post some more configuration screenshots when I have access to a 5100B again.
The Chef
join:2003-12-09

The Chef to MyTechLife

Member

to MyTechLife
said by MyTechLife:
Checking winipcfg again, the LAN adapter was back at a 68.xxx.xxx.xxx address with the gateway as one IP address off the LAN adapter address.

I thought that this new modem would act like a firewall, hiding the LAN adapter address from the internet. I confirmed that the setting was "PPP is on the modem". Why couldn't I connect to the internet when the modem was issuing 192.xxx.xxx.xxx address to the LAN adapter? How did it end up issuing a 68.xxx.xxx.xxx address to the modem?

The new modem is not a firewall. Unless configured otherwise, once a connection is established to the Internet the public IP address is passed to the LAN adapter.

Until that occurs, or when you are not connected, a private IP address is passed to the LAN adapter.

If you want to always pass a private IP address to the LAN adapter, modify the modem via the GUI at 192.168.0.1 to issues a private IP address (and not a public IP address).
said by MyTechLife:
I was also expecting to find a "b" in the model number on the bottom of the modem ?
The 5100b was the name for the new modem during development and not the actual model number. For whatever reason it stuck and alot of people are using the b designation.

MyTechLife
Tech Guru
join:2001-01-17
Reno, NV

MyTechLife

Member

said by The Chef:
...If you want to always pass a private IP address to the LAN adapter, modify the modem via the GUI at 192.168.0.1 to issues a private IP address (and not a public IP address)...
At what page in the GUI would I do this? (I do not currently have access to the modem to find this in the GUI myself.)

Would this effectively change the modem to a NAT "firewall"?

jm8
join:2003-09-21
Graceville, FL

jm8

Member

Advanced>Connection Configuration, you will see it at the bottom of the page.
The Chef
join:2003-12-09

The Chef to MyTechLife

Member

to MyTechLife
said by MyTechLife:
Would this effectively change the modem to a NAT "firewall"?
Not really. All traffic from the DSL connection is directed to the one PC in both cases.

MyTechLife
Tech Guru
join:2001-01-17
Reno, NV

1 edit

MyTechLife

Member

OK, before I bought my router I had purchased the Webshare firmware upgrade for my Westell Wirespeed modem that unbridged the modem and made my computer's IP address invisible to the internet. I guess the 5100B is configured differently.

Doctor Olds
I Need A Remedy For What's Ailing Me.
Premium Member
join:2001-04-19
1970 442 W30

Doctor Olds

Premium Member

I'm still trying to understand what your Wirespeed (and it's firmware being upgraded or not) has to do with this thread???

MyTechLife
Tech Guru
join:2001-01-17
Reno, NV

MyTechLife

Member

I'm trying to understand the capabilities of the new modem (or non-capabilities compared to previous SBC modems). Thanks to those who've helped. I'll be playing with the new modem again tomorrow, so I won't have to hi-jack the thread any longer.

Doctor Olds
I Need A Remedy For What's Ailing Me.
Premium Member
join:2001-04-19
1970 442 W30

1 recommendation

Doctor Olds

Premium Member

said by MyTechLife:
I'm trying to understand the capabilities of the new modem
All that really required was reading this thread and following the links in this thread, not posting about problems you had and then asking for specific help in this thread.