Re: Airport e Skype

sicuro? io a parte che non ho dovuto aprire nessuna porta perche' zone
alarm mi diceva (su win) ch skype.exe voleva la porta 80, e poi l'ho
letto da tantissime parti

http://www.skype.com/help/guides/firewall.html

Port number: 54058

Common name(s): client-port on Red Hat Linux 9.0, Fedora Core 1, Red
Hat Enterprise 3

Common service(s): client

Service description(s): Outgoing client connections from systems.

Common server(s): RPC based services, Windows Messaging Service.

Common client(s): All client software (SSH, Web clients, etc.)

Common problem(s): Insecure client software

Encrypted options: Not applicable

Secure options: Not applicable

Firewalling recommendations: Block inbound connections to client ports,
allow outgoing connections and returning packets (keep state)

Attack detection: As a general rule data coming in to client ports that
is not part of an established connection is likely an attack.
Exceptions exist of course, such as FTP, various instant messenger
protocols, file sharing protocols, IRC's DCC, and so on.

Related ports: 32768 and other client ports

Related URL(s):
http://seifried.org/security/os/linux/20011005-linux-port-behavior.html

Other notes: Port 32768 is the first port used by the operating system
for outbound connections, thus it is likely you will see outbound
connections from port 32768 and up. If you run netstat on Red Hat Linux
or UNIX you will see something like:

.

Relevant Pages

  • RE: [Full-Disclosure] A rather newbie question
    ... show a few different ports but port 60096 stands out. ... Common name: client-port on Red Hat Linux 9.0, Fedora Core 1, Red Hat ... Outgoing client connections from systems. ...
    (Full-Disclosure)
  • Re: Listening and Establish TCP connections on/from the same IP end po
    ... and accept client connections as well as be able to establish connections to ... The application needs to listen on a specific port because that's where the ... But it does not allow both sockets to actually _use_ that IP/port at the same time, nor would there be any reliable way to let that happen. ... Client ports are pretty much _never_ assigned according to protocol, and firewalls don't block inbound traffic based on the sender's port at all. ...
    (microsoft.public.dotnet.framework)
  • Firewall access rule on ISA2004 for web proxy
    ... I need help getting the web proxy working for browsing the web. ... Connections to port 8080 get denied by a rule further down in the rule list ... All failed entries are client user anonymous. ...
    (microsoft.public.isa)
  • Re: UDP server (in Java)
    ... > wait accepting new connections on a well known port. ... > are mapped onto a new port and handled seperately through that. ... > initial thought was to send the client back the port number of a new ... > arbitrary UDP port. ...
    (comp.lang.java.programmer)
  • Re: [Full-Disclosure] A rather newbie question
    ... show a few different ports but port 60096 stands out. ... Outgoing client connections from systems. ... > Common server: RPC based services, ...
    (Full-Disclosure)