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Top Forums UNIX for Beginners Questions & Answers To determine the firewalls/interfaces from and to an AIX server Post 303045128 by rbatte1 on Thursday 12th of March 2020 10:26:50 AM
Old 03-12-2020
It's not a super clear question, but you might consider:-
  • If it's user login, these would be recorded in the system logs - look in /etc/syslog.conf or /etc/rsyslog.conf for the files you write to.
  • If it's FTP or SFTP users, see above.
  • If you are looking for other services that report their activity such as a web-server on port 80, then again look in the relevant logs
If you want to see connections from anything connected when you look, you will get lots of output from something like netstat -na | grep ESTABLISHED however this does not show UDP connections and is only a report of connections at that instant.
If you want to see ALL connections whenever they are made, then you are probably looking at tcpdump, however that can generate vast amounts of traffic. It may be sensible to have a look at the output from netstat -na|grep LISTEN and decide which of the ports listed you want to watch traffic from. Tools such as Wireshark (formerly Ethereal) can help with interpreting the data recorded. If you fire up tcpdump, write it to a file and look at one port at a time to keep the data collected to a manageable size.

When moving to a new server, will it have a new DNS record and a new IP address? Depending how things connect, then you might be able to just create/alter CNAME records in the DNS to re-route the traffic.

Sorry that this might not help much, but it's a little difficult to exactly understand your need.



I hope that this helps,
Robin
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IPTABLES-XML(1) 						  iptables 1.4.21						   IPTABLES-XML(1)

NAME
iptables-xml -- Convert iptables-save format to XML SYNOPSIS
iptables-xml [-c] [-v] DESCRIPTION
iptables-xml is used to convert the output of iptables-save into an easily manipulatable XML format to STDOUT. Use I/O-redirection pro- vided by your shell to write to a file. -c, --combine combine consecutive rules with the same matches but different targets. iptables does not currently support more than one target per match, so this simulates that by collecting the targets from consecutive iptables rules into one action tag, but only when the rule matches are identical. Terminating actions like RETURN, DROP, ACCEPT and QUEUE are not combined with subsequent targets. -v, --verbose Output xml comments containing the iptables line from which the XML is derived iptables-xml does a mechanistic conversion to a very expressive xml format; the only semantic considerations are for -g and -j targets in order to discriminate between <call> <goto> and <nane-of-target> as it helps xml processing scripts if they can tell the difference between a target like SNAT and another chain. Some sample output is: <iptables-rules> <table name="mangle"> <chain name="PREROUTING" policy="ACCEPT" packet-count="63436" byte-count="7137573"> <rule> <conditions> <match> <p>tcp</p> </match> <tcp> <sport>8443</sport> </tcp> </conditions> <actions> <call> <check_ip/> </call> <ACCEPT/> </actions> </rule> </chain> </table> </iptables-rules> Conversion from XML to iptables-save format may be done using the iptables.xslt script and xsltproc, or a custom program using libxsltproc or similar; in this fashion: xsltproc iptables.xslt my-iptables.xml | iptables-restore BUGS
None known as of iptables-1.3.7 release AUTHOR
Sam Liddicott <azez@ufomechanic.net> SEE ALSO
iptables-save(8), iptables-restore(8), iptables(8) iptables 1.4.21 IPTABLES-XML(1)
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