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Which ADSL Modem

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Which ADSL Modem - 16.Mar.2004 2:15:00 AM   
leonhughes

 

Posts: 149
Joined: 19.Mar.2001
From: UK
Status: offline 		Hi! I need to install an ISA server to provide firewall / proxy services from an ADSL connection. Basically I need an ADSL modem that can handle multiple public IP's, and present them to the ISA server via ethernet without introducing NAT!
Budget contraints rule out anything exotic like a nice Cisco box - I need to find a linksys equivelent that can handle the multiple IP's.

Any suggestions would be greatly appreciated.

Leon.
Post #: 1
RE: Which ADSL Modem - 21.Mar.2004 4:05:00 AM   
sniper

 

Posts: 687
Joined: 9.Aug.2001
From: OK, USA
Status: offline 		Netgear or alcatel will work. Why can'the DSL do NAT. I have seen that config serveral times. And it works. Just make sure when the LAT is built it does not contain all the other private IP address ranges

(in reply to leonhughes)
Post #: 2
RE: Which ADSL Modem - 22.Mar.2004 2:08:00 AM   
leonhughes

 

Posts: 149
Joined: 19.Mar.2001
From: UK
Status: offline 		I Don't want NAT as I need to be able to support L2TP VPN's from clients that potentially don't support NAT-T. I could be wrong, but I thought the Netgear stuff had to use NAT?

(in reply to leonhughes)
Post #: 3
RE: Which ADSL Modem - 22.Mar.2004 4:02:00 AM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		Isa 2000 is aways nat from lat
Isa 2004 routing and nat

http://www.winnetmag.com/Article/ArticleID/40597/40597.html

http://www.tacteam.net/isaserverorg/vpnkitbeta2/outboundnat-t.htm

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/isa/isaabout_2jzi.asp

http://www.isaserver.org/tutorials/ISA_Server_Security_Checklist__Part_2_Securing_the_ISA_Server_Configuration.html

http://www.winnetmag.com/Articles/Print.cfm?ArticleID=9749

(in reply to leonhughes)
Post #: 4
RE: Which ADSL Modem - 22.Mar.2004 1:07:00 PM   
leonhughes

 

Posts: 149
Joined: 19.Mar.2001
From: UK
Status: offline 		Thanks for the reply. I know that NAT cannot be turned off if the destination network is in the LAT etc.., I also know about the patch that is available for the various OS's. Point is that some of the machines that will be connecting to the VPN through L2TP WILL NOT have ths patch installed.

All I want is some pointers to which ADSL modem to buy that WILL NOT ITSELF use NAT - thus allowing all of the not patched clients to connect.

Thanks,

Leon.

(in reply to leonhughes)
Post #: 5
RE: Which ADSL Modem - 22.Mar.2004 4:20:00 PM   
miqbal

 

Posts: 19
Joined: 10.Oct.2003
From: U.K
Status: offline 		Hi Leon
Take a look at this one, it is used by BT for NAT/NONAT.
http://www.uk-bug.net/modules.php?op=modload&name=Sections&file=index&req=listarticles&secid=2

(in reply to leonhughes)
Post #: 6
RE: Which ADSL Modem - 22.Mar.2004 9:21:00 PM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		Any modem can work...Whan you install ISA NAT and SNAt is used to conect the mashines on LAT modem istaslf it is just a modem if you use a router the router could be use nat and this is differnt

(in reply to leonhughes)
Post #: 7
RE: Which ADSL Modem - 24.Mar.2004 1:10:00 PM   
leonhughes

 

Posts: 149
Joined: 19.Mar.2001
From: UK
Status: offline 		fabl99 - thanks for that..
papata - I have no idea what you're on about - that makes no sence to me at all. What's a 'LAT Modem'?

Cheers,

Leon.

(in reply to leonhughes)
Post #: 8
RE: Which ADSL Modem - 24.Mar.2004 7:01:00 PM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		Sorry for that ....
ISA Server use the NAT not the modem itself...
modem its just a device working with the OS ...
on the other side routers are fully working machines have their own OS and have their own functions, they can use NAT for multiple machines sharing a single Internet connection as well as the ISA Server or Internet Connection Sharing or MS Routing and Remote Access - static and Dinamic NAT,if you install the ISA 2000 you can only USE Dynamic NAT in 2004 you can use both...nothing to do with the modem unless is a router using his own Software,Flash, OS and NAT Network Address Translation is performed by a NAT router, so is a NAT device as well as the ISA Server .

http://www.isaserver.org/tutorials/Tom_Shinders_ISA_Server_Questions_of_the_Week__10142002.html

read the bootom lines
If you don't want NAT--->
Cisco ADSL Routers,PIX...this is just my opinion and I AM NOT A guru not even a litle .

(in reply to leonhughes)
Post #: 9
RE: Which ADSL Modem - 24.Mar.2004 7:21:00 PM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		fabl99
if this is a good router that is fine.
If you can choose not to use nat on the router even better...
I had a litle problem with a ADSL connection before - >changed about 5 diferent ADSL routers with build in modems and found that only the cisco router and internal modems can keep the conection withouth crashing...the exchange was too far and all routers except Cisco 2600 and the internal Zomm ADSL was unable to keep the conection...but this is diferent matter and the 2600 series with DSL card still expensive...

Good luck, Leo soory for the LATModem [Smile]

(in reply to leonhughes)
Post #: 10
RE: Which ADSL Modem - 25.Mar.2004 2:58:00 AM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		http://www.sangoma.com/products/p_s518adsl-specs.htm

http://www.lancom-systems.de/eu/produkte/lc_1621_adsl_isdn.php

http://www.lancom-systems.de/eu/produkte/lc_821_adsl_isdn.php

http://www.cisco.com/warp/public/cc/pd/rt/1700/index.shtml

(in reply to leonhughes)
Post #: 11
RE: Which ADSL Modem - 26.Mar.2004 7:28:00 PM   
papata

 

Posts: 83
Joined: 1.Feb.2004
From: London
Status: offline 		WAN routing without external routers! Our award winning WANPIPE(TM) drivers and software use the S-Series cards to add the functionality of a powerful Wide Area Network router to all popular PC Server and workstation platforms.

http://www.sangoma.com/products/p_wanpipe_specs.htm

http://www.sangoma.com/products/p_adsl_cards.htm
$250

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3087350552 business class router from Siemens

if you pay the shipping price from USA don't forget that the $ is cheap if you use GB ú

[Smile]

(in reply to leonhughes)
Post #: 12
RE: Which ADSL Modem - 29.Mar.2004 1:04:00 AM   
leonhughes

 

Posts: 149
Joined: 19.Mar.2001
From: UK
Status: offline 		Thanks for the replies!

Will be a couple of weeks before this needs to go in. Will be thoroughly researching the options.

Thanks Again!

Leon.

(in reply to leonhughes)
Post #: 13

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