09-10-2020 12:17 PM
First I just want to say thank you for adding this to Unleashed! I have configured a Profile for this and enabled it on a WLAN, but I am not seeing my Wi-Fi Calling Client, even after refreshing, on the Summary tab even though I’m currently on a Wi-Fi Call. How do I go about troubleshooting this?
09-10-2020 02:33 PM
09-10-2020 02:44 PM
09-11-2020 02:22 AM
09-11-2020 12:55 PM
In reviewing your reply, I did the following:
Some more detail:
The actual DNS lookup performed by the Wi-Fi Calling client is:
$ sudo tcpdump -ni vlan19 host 198.51.100.200 and port 53
tcpdump: listening on vlan19, link-type EN10MB
13:06:02.082764 198.51.100.200.42157 > 198.51.100.254.53: 24301+ A? epdg.epc.mnc260.mcc310.pub.3gppnetwork.org.(60) (DF)
The host above as well as ss.epdg.epc.mnc260.mcc310.pub.3gppnetwork.org are just CNAMEs for their respective “geo” names:
$ host -t A epdg.epc.mnc260.mcc310.pub.3gppnetwork.org
epdg.epc.mnc260.mcc310.pub.3gppnetwork.org is an alias for epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org.
epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org has address 22.214.171.124
$ host -t A ss.epdg.epc.mnc260.mcc310.pub.3gppnetwork.org
ss.epdg.epc.mnc260.mcc310.pub.3gppnetwork.org is an alias for ss.epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org.
ss.epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org has address 126.96.36.199
The IP addresses returned for epdg.epc.geo.mnc260.mcc310.pub.3gppnetwork.org and related are highly dynamic, change frequently and have a very short TTL..
Lastly, after changing the ePDG to epdg.epc.mnc260.mcc310.pub.3gppnetwork.org, which is what the client actually uses, the web UI started to populate for some reason, but it’s not clear why; it is also very possible my testing results are highly skewed due to the delay between when a change is made and what’s reflected in the Wi-Fi Calling Summary tab. Subsequent Wi-Fi calls appear to eventually get reflected in the web UI—they don’t readily show up with frequent refreshes—but this is definitely not reflected in real-time and this hampers troubleshooting. I guess I’ll consider the matter closed for now unless you are interested in me trying some more things.
Are there any command line operations I can run on the AP to gain greater insight that might be omitted or delayed in relation to the web UI?Thanks Tony!