How to see incoming IPs in Linux?

I am wondering what is the command/utility to have a real-time view of incoming IPs to my server, ideally along with the port and connected.

Solution 1:

Use pktstat -n

interface: eth0
bps

   bps    % desc
 162.3   0% arp
 286.5   0% llc 802.1d -> 802.1d
 544.3   1% tcp 172.16.1.5:22 <-> 172.16.1.95:8074
 34.0k  87% udp 172.16.1.1:514 <-> 172.16.1.5:514
 350.1   0% udp 172.16.1.5:24330 <-> 209.18.47.62:53
 329.4   0% udp 172.16.1.5:34870 <-> 209.18.47.62:53
 388.3   0% udp 172.16.1.5:4470 <-> 209.18.47.62:53
 407.4   1% udp 172.16.1.5:47008 <-> 209.18.47.62:53
 741.6   1% udp 172.16.1.5:53 <-> 172.16.1.74:43289
 663.6   1% udp 172.16.1.5:53 <-> 172.16.1.74:44589
 647.7   1% udp 172.16.1.5:53 <-> 172.16.1.74:58223
 128.9   0% udp 172.16.1.74:5353 <-> 224.0.0.251:5353
 160.7   0% udp6 fe80::21c:bfff:fecf:a798,5353 <-> ff02::fb,5353

The pktstat source code is hosted on Debian's site, or you can get it from SourceArchive.com

Solution 2:

For 'purdy' display, I'm partial to a tool called 'iptraf' that will do just what you mention, as well as per interface, and per port aggregates.

For core Linux tools, trusty netstat will do the trick...