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643 posts

Ultimate Geek


  # 55029 8-Dec-2006 17:17

Ben: Hmmmm... I thought it duplicated the routers MAC addresses to the modem's outside interface and then blindly forwarded packets?

You got the idea but thats a 'full' bridge mode. Half bridge leaves the modem in control of the PPP-over-ATM (authentication & encapsulation) and uses it's TCP/IP stack to deliver the WAN IP packets straight from out of the PPPoA layer to your PC/router (and not through it's NAT engine).

The PPPoA ADSL topology is ugly compared to PPPoE ADSL or ethernet, it looks a bit like this;

Physical Link         Link     Transport   Data?
ADSL     ATM VCs   PPP     IP             UDP/TCP
                         ^       ^
                         |        |
Bridge mode -----/        |
                                  |
Half-bridge --------------/




Sniffing the glue holding the Internet together

11 posts

Geek


  # 55551 15-Dec-2006 10:01
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OK, so I'm following about half of this. I think I have a simpler version of the problem but would be keen on understanding and resolving it ...

Have just moved from Woosh to PDQ, and have a Dynalink RTA 1025W wireless modem/router. Internet works wonderfully. I can use FileZilla or Windows ftp to access my FTP sites; but I develop applications (field and office) that use FTP; I develop in Delphi using the Indy FTP client, and when I'm on PDQ I'm getting a message "I won't open a connection to 192.168.1.2 (only to 121.72.14.147)"

My applications work fine if I'm going through Woosh or my Vodem; and the other FTP sites work fine through PDQ.

I figure I can tackle this issue on two fronts : working out what the Indy client is doing differently, and working out what is different about the PDQ setup.

Can anyone give me some pointers about setting up the wireless modem/router ?

Cheers,

Simon

 
 
 
 


11 posts

Geek


  # 55552 15-Dec-2006 10:07
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Well, doh.

IDFTP1.Passive:=True;

Works immediately. Would still be interested in a lesson on NAT and my router though ...

Simon


Ben

317 posts

Ultimate Geek

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# 55567 15-Dec-2006 11:10
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Hmmm, I think the problem is with the ":=" in your code. 
No sane language uses that for an assignment statement. ;-P

643 posts

Ultimate Geek


  # 55634 16-Dec-2006 13:31

Ben: Hmmm, I think the problem is with the ":=" in your code. 
No sane language uses that for an assignment statement. ;-P
some RADIUS servers use that assignment operator
here is some NAT info for those interested:
http://en.wikipedia.org/wiki/Network_address_translation




Sniffing the glue holding the Internet together

Ben

317 posts

Ultimate Geek

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  # 55636 16-Dec-2006 14:19
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barf I was kidding.  I was harassing him for using pascal/delphi =)

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