Present's enterprises used the computer regarding the staff to carry on the strict limit, for instance could not glance over the homepage, could not play certain games, could not on MSN, limit port and so on. Some limits have the breakthrough, the bilateral contest like a raging fire launch in the local area network, do not have the gunsmoke, but tends the superheating. Below we analyze this contest bilateral respective strategic move.
First, the website is related
1st, limit:
Cannot visit the website, the network game (for instance unites audiences) not to be able to play, this kind of limit limited generally has wanted to visit the website the IP address.
2nd, breakthrough:
Is very easy regarding this kind of limit to break through, acted with ordinary HTTP may, or the SOCKS proxy was also may. Now on-line looks for the HTTP proxy is very easy, as soon as grasps big. Proxy has been possible with ease to visit the goal website in IE the Riga HTTP.
Second, the agreement is related
1st, limit:
Like cannot FTP, TELNET and so on, but also had limits some network game's server to carry the IP address, but these games did not support the ordinary HTTP proxy.
2nd, breakthrough:
This kind of situation may use the SOCKS agent, coordinates the Sockscap32 software, adds to Sockscap32 the software, visits through the SOCKS proxy. The procedure generally may break the limit. Regarding some games, may consider Permeo Security Driver this software. If linked SOCKS also to limit, that might use socks2http, will not link HTTP also to limit.
Third, a package of filtration is related
1st, limit:
Or has forbidden some key words. This kind of limit has been strong, generally is the filtration which does through the agent server or the hardware firewall. For instance: 2006 forbid MSN through ISA Server, has made a package of filtration. This kind of limit is quite difficult to break through, the ordinary proxy is unable to break the limit.
2nd, breakthrough:
Because this kind of limit has made a package of filtration, can filter the key words to come, must therefore use the encryption proxy, i.e. among walks HTTP or SOCKS proxy data stream after encryption, for instance springboard, SSSO, FLAT and so on, so long as acted encrypts has been possible to break through, coordinated Sockscap32 again with these softwares, this kind of limit did not have an effect, MSN might on.
Fourth, the port is related
1st, limit:
Has limited certain ports, the most violent situation is the limit only then 80 ports may visit, also can only have a look at the homepage, including the OUTLOOK receiving, FTP limited. Certainly regarding limits several special ports, the breakthrough principle is the same.
2nd, breakthrough:
(1). looks for the ordinary HTTP 80 port's proxies, looks like 12.34.56.78: 80, coordinate socks2http like this, changes into the SOCKS proxy the HTTP proxy attire, then coordinates SocksCap32 again, was very easy to break through.
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