nwrickert
sand groper
Premium,MVM
join:2004-09-04
Geneva, IL
 ·AT&T Midwest
| reply to wayjac
Re: IP Passthrough and DMZ
You might be missing some context.
Most bellsouth users have Westell modems. Most Ameritech users have Speedstream modems.
The Westell modems are often fully fledged routers in their own right, and using them with IP pass through makes little sense. The speedstream modems are crippled routers, so using IP passthrough has some benefits when connected via a real router.g
I am currently using a Westell 327w, though in Ameritech territory. I cannot think of any reason to use IP pass through, except perhaps out of curiousity to see how it works. I also have a Speedstream 5100b as a spare modem, and that is configured for IP pass through (gives the best results that way).
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AT&T dsl; Westell 327w modem/router; SuSE 10.1; firefox 2.0.0.14 |
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wayjac
Premium
join:2001-12-22
Indy | Here's the setup I have, a bellsouth 2210 modem and a linksys wrt54g router.
I configure the 2210 for PPPoE and ip passthrough or dmz |
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wayjac
Premium
join:2001-12-22
Indy | reply to nwrickert
I didn't want to include att/sbc speedstream modems in this discussion.
Bellsouth modems are router and modem, and usually connected to a second router. |
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ropeguru
Premium
join:2001-01-25
Hollywood, FL
clubs:
edit:
May 6th, @04:54PM
| reply to wayjac
Save yourself a lot of headache and just setup the 2210 in bridged mode and let your linksys do the PPPoE and get the external IP. Even when ip passthrough is enabled or you setup the DMZ, some applications just don't like it. |
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NormanS
Premium,MVM
join:2001-02-14
San Jose, CA
·Pacific Bell - SBC
| said by ropeguru  :Save yourself a lot of headache and just setup the 2210 in bridged mode and let your linksys do the PPPoE and get the external IP. Even when ip passthrough is enabled or you setup the DMZ, some applications just don't like it. Although wayjac doesn't want to hear about the SBC SpeedStream modems, I'd like to weigh in with my experience. Putting my SS4100 modem in "PPPoE on the modem, use a public IP address" worked for me, and is comparable to the IP passthrough. The only problem I encountered was that every time I reset my router, I forced a new IP address, and that required a number of other steps to get my mail server on track again.
I am currently using "PPPoE on the modem, use a private IP address". The result is "cascaded NAT".
Now I've learned that you AT&T Southeast folks have your own way of doing things, primarily based on the nature of the CPE issued by Bellsouth. But SBC issued equipment with a different configuration, and we have actually figured out how to make things work with the SBC issued CPE. For those of us with single user modems, even with limited router functions, adding a router was necessary for IP sharing because the SpeedStream modems, being crippled routers, were no good at IP sharing. For us, cascaded NAT has rarely been a problem, and bridging the modem is usually a last resort, not a first resort.
It appears that wayjac has decided to become a Lab Rat, and try to mix BS CPE in an old SBC region, and is merely trying to find a new way of doing things.
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Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum |
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Canezoid
join:2001-02-16
Powder Springs, GA
·AT&T Southeast
| It basically boils down to the same result, maybe just different wording. The issue of bridging of AT&T SE CPE gateways is usually the result of a sub using a 3rd party router, aka Linksys and not understanding the NAT'g of the 2 devices when they are in series and not being able to configure either device correctly, hence they can't surf, game or whatever.
I'm not really sure what jist of the question is. Yes, Bellsouth CPE are "routers", they have DHCP functions, most ISP issued equipment will nowadays. The "advice" of bridging is only given as per what I said above. It's not that "other" functions are being ignored, it's just what's done sometimes.
Mixing equipment between ISP areas would usually only require the VPI/VCI settings to be reconfigured, has nothing to do w/ IP Passthrough. |
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wayjac
Premium
join:2001-12-22
Indy
·AT&T Midwest
| Thanks for the reply.
With 2wire, speedstream and a few others reconfiguring vpi/vci is not needed they "autoconfigure"
The 2701HG-B has a PVC list
8/32, 8/35, 8/37, 8/38, 8/81, 0/32, 0/35, 0/38, 0/105, 0/100
The user can set the vpi/vci to 88/332 and the modem will detect and use the vpi/vci if its on the list |
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