Server dependencies Post: 302650623

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Top Forums UNIX for Dummies Questions & Answers Server dependencies Post 302650623 by frappa on Monday 4th of June 2012 03:50:59 AM

06-04-2012

Registered User

Hi,

sorry for not being too clear.

netstat can be used in order to look both for services provided by the monitored server and external services for which the server is acting as a client.
Actually netstat output reports both 'Local address' and 'Foreign address' columns: the former is for local network sockets, while the latter is for 'external' network sockets.
When I stated "[...]You could find services provided by the server itself[...]", I meant that you could discover services for which the server is acting both as a server and as a client (trivial case: think about SSHing to the server itself).

I also didn't mention that for UDP traffic for which the server acts as a client with respect to an external service provide, you may never see a corresponding row in netstat output, because UDP connections are stateless by design (for exceptions have a look at: networking - netstat -na : udp and state established? - Stack Overflow that is, netstat output will show UDP sockets just for services for which the server is actually acting as a server.
So, in order to see if an application is using DNS (implemented as a service listening on UDP port 53 on the server side) you'd better use a network traffic sniffing tool.

see ya
fra

Last edited by frappa; 06-04-2012 at 04:51 AM.. Reason: correcting some typos

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LEARN ABOUT LINUX

aa-unconfined

AA-UNCONFINED(8)                                                     AppArmor                                                     AA-UNCONFINED(8)

NAME

       aa-unconfined - output a list of processes with tcp or udp ports that do not have AppArmor profiles loaded

SYNOPSIS

       aa-unconfined

DESCRIPTION

       aa-unconfined will use netstat(8) to determine which processes have open network sockets and do not have AppArmor profiles loaded into the
       kernel.

BUGS

       aa-unconfined must be run as root to retrieve the process executable link from the /proc filesystem. This program is susceptible to race
       conditions of several flavours: an unlinked executable will be mishandled; an executable started before a AppArmor profile is loaded will
       not appear in the output, despite running without confinement; a process that dies between the netstat(8) and further checks will be
       mishandled. This program only lists processes using TCP and UDP. In short, this program is unsuitable for forensics use and is provided
       only as an aid to profiling all network-accessible processes in the lab.

       If you find any bugs, please report them at <http://https://bugs.launchpad.net/apparmor/+filebug>.

SEE ALSO

       netstat(8), apparmor(7), apparmor.d(5), aa_change_hat(2), and <http://wiki.apparmor.net>.

AppArmor 2.7.103                                                    2012-06-28                                                    AA-UNCONFINED(8)