09-16-2019
What happens when you look at the arp tables, before and after?
On ethernet, as you know, the actual LAN routing is done by MAC address; so when we change IP address, we need to flush / rebuild the arp table (on both ends), generally speaking.
If we change an IP address and do not flush the arp table, there will often be an incorrect IP address <---> MAC address in the arp table and this can cause LAN routing snafus.
PS: I'm writing this based on knowledge from decades ago, off the top of my head, and have not done any research on arp in a long time.
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https://www.unix.com/unix-for-dummies-questions-and-answers/246504-solaris-11-2nd-nic-different-subnet.html
apologies if linking is not appropriate
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LEARN ABOUT DEBIAN
ringstat
RINGSTAT(1) Voicetronix Telephony Tools RINGSTAT(1)
NAME
ringstat - Perform a simple test of FXS (station) port ring and audio paths.
SYNOPSIS
ringstat [options]
DESCRIPTION
The ringstat utility performs a simple test of FXS port ring circuits. It exercises the card base functions including the audio path, ring
and hook detection. The ports will ring while on hook, play 10 seconds of dial tone if taken off hook, then ring again when they go back
on hook.
Press any key (on the keyboard) to end this test.
OPTIONS
The following options are available:
--help, -?
Show summary of options.
--card number
Explicitly select the card to test. Default is card 0.
--module number
Explicitly select the module of a card to test. Default assumes 8 ports on the card to test. Valid values here are presently 0 or
1. It also assumes all modules have 4 ports. This option may change in the future.
SEE ALSO
vpbecho(1), measerl(1)
AUTHOR
Ron Lee, Peter Wintulich, David Rowe, Voicetronix <support@voicetronix.com.au>
This manual page was written by Ron <ron@debian.org>, for the Debian project (but may be used by others).
VPB driver package Jan 4, 2007 RINGSTAT(1)