After reading a lot of DDNS-posting about a mixture of Sophos and other DDNS-providers, I will focus on ONLY Sophos as default DDNS-Service. If you're satisfied you can also like this discussion.
Imho the manuals and help in XG is not perfect, so here quite a few things which you should know and which hopefully helps you to save some time.
1.) Where can I find DDNS?
Section CONFIGURE > Network > Dynamic DNS
2.) What should be entered?
"<HOSTNAME>.myfirewall.co" is the only way that works.
3.) What means "Hostname"?
HOSTNAME ist your device-hostname which you can find under Section SYSTEM > Administration > Admin Settings > Hostname, which is by default your device-ID/SN (for example, looks like: C020024GXBHM5F3)
4.) Can't enter my entry because XG says "DDNS Service in currently unavailable" - And now?
So here it goes a little bit crazy, maybe it's a bug and maybe a Sophos-engineer can fix or explain it.
4.1) Although the manual says "NATed Public IP" which is logical for the most cases with a router in front of your XG, take "Use Port IP" first.
I was also surprised, that the feedback was positive (DDNS account 'xxxxx.myfirewall.co' has been created successfully)
OoooK, IP was updated, DNS lookup for the hostname returns my internal IP "192.168.x.x"... Nice! :D
Btw after some investigations I found out, that the DNS service runs in the AWS cloud, so you can test the DNS lookup with their AWS-DNS like "ns-1407.awsdns-47.org" without a shorter delay, because it's DNS ;)
4.2) After that you can change the IPv4 address setting back and you get the confirmation "DDNS account 'xxxxx.myfirewall.co' has been updated successfully".
And also the public IP shows the NAT- or public-IP.
Check it out and reply if it works or not!
Notice:
* You can't make a lookup for the domain "myfirewall.co". Their are no A/AAAA-Records.
* If DDNS works generally, the update itself fails several times, as you can see in your logs.
Yours,
Chris
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