Re: TAL-IPC protocol with pf

[Brandon Mercer <b.mercer@trustetc.com>]

jason@dixongroup.net wrote:

>>Hello Group,
>>Boy have I got one for you!  So my broker dealer upgrades his software
>>that he uses to get pricing and he can't get any information.  I'm on
>>the phone with their tech support and she says that I need to allow port
>>1838 outbound on my firewall.  Fair enough, I try that and things still
>>don't work.  So I verify with the tech support rep that it runs over
>>tcp... **BIG PAUSE** she replies, well actually it works over TAL-IPC
>>which is a proprietary protocol that we've developed.  Oh... ok... so
>>tcp wasn't good enough for you?  Anyway, the problem as it stands is
>>that I still need to make this work.  I'm running OpenBSD 3.5 and here
>>is a snippet of my ruleset.
>>    
>>
>
>I seriously doubt that they've rewritten their own transport-layer
>protocol.  I imagine it's just another application-layer protocol on top
>of TCP.  What type of traffic capture have you performed?  What _really_
>leads you to believe that a broken application upgrade has anything to do
>with the firewall.
>  
>
That was my first impression too.... but in all seriousness it checks 
out.  :-(  Here's a link to provide some humor 
http://www.mastertrader.com/education/firewalls.asp. 
Brandon