Wireless Access

hi

what does it mean exactly NAT Traversal ?

kind regards
chris

Here is a nice write up from MicroSoft:
http://www.microsoft.com/technet/community/columns/cableguy/cg0802.mspx
or...
http://www.isp-planet.com/technology/2001/ipsec_nat.html
hope this helps. -john

NAT is Network Address Translation. litterally it translates the network address from an internal network to an external network. this is most usefull when you have a network you want to connect to the internet, but you don't have a INAN* routeable subnet.

NAT has some side effects, depending on implemtation, like poor handling of UDP and incomming connections. NAT Transversal simply referse to certain programs and protocols attempts to overcome these limitations.

what is the context? perhaps we could provide more specific information.

*INAN Internet Names and Numbers, 192.168 is not a INAN address

Hi Chris,
NAT is working like this:
Local network using 192.168.1.xxx address (where xxx is number of every PC); ADSL router at 192.168.1.254 and external address by DCHP of ISP (example 80.220.1.28). When a PC connect to internet every socket form PC to router has 192.168.1.xxx address (that's internal IP) then after router become 80.220.1.28.
In this way all PC of local network can access to internet and all use unique IP address (main problem of internet are insufficient address avaiable).
The main problem of NAT is using of same port concurrently by two different PCs.
NAT Traversal solve this problem and some other.

Antonio Vigliotti