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mail_e36 is offline mail_e36
2010-11-12 , 18:29
Posts: 393 | Thanked: 67 times | Joined on Feb 2010
#1
Has anyone noticed that if you try to port scan (nmap) an IP address (or web URL) from a cellular provider (the grps0 interface in our case) you receive an automatic SYN, ACK back, showing the port as open, even if the port being scanned is actually closed?

Does anyone have any insight into this?
 
GameboyRMH is offline GameboyRMH
2010-11-12 , 18:56
Posts: 692 | Thanked: 264 times | Joined on Dec 2009
#2
Cellular data networks are heavily monitored and tightly controlled by the carriers, I'm not one bit surprised to see them meddling with the traffic...
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Creamy Goodness is offline Creamy Goodness
2010-11-12 , 19:10
Posts: 1,463 | Thanked: 1,916 times | Joined on Feb 2008 @ Edmonton, AB
#3
probably your cell provider is "unique"
mine shows closed when i scan my home computer, port 80
 
CormacB is offline CormacB
2010-11-12 , 20:01
Posts: 137 | Thanked: 150 times | Joined on Jan 2010
#4
It might be an attempt to reduce latency on a crappy network.
 
egoshin is offline egoshin
2010-11-12 , 20:09
Posts: 992 | Thanked: 995 times | Joined on Dec 2009 @ California
#5
Originally Posted by CormacB View Post
It might be an attempt to reduce latency on a crappy network.
Yes, it's true - actually, it can be NAT-ed too with TCP connection emulation.

It is all for performance.
 
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