On 01/04/2015 10:44 AM, Fred n Sandy wrote:
I have a perplexing problem with my lampserver. My location
has a dynamic IP, so I use a DDNS service which, in this case,
requires multiple instances (-M option) of the DDNS client. I
give the command, the processes start and all is right with the
world until some unknown time later when the dirty $#@! quits.
Depending on your ISP, you might have a consistent host name, even
though your IP address changes. If so, just use that host name, instead
of bothering with DDNS. For example, my ISP provides a DHCP address,
which changes so seldom it's virtually static. However, the host name
is based on the cable modem and firewall MAC addresses and so never
changes, unless I change hardware. Failing that, there should be a hook
in the DHCP client, which you can use to trigger a DDNS update.
This is yet another example of why we should be moving to IPv6 as soon
as possible. I have my own /56 IPv6 subnet and every IPv6 capable
device, including tablet and smart phone has a public IPv6 address that
I can reach from just about anywhere. I use a publicly available DNS
server to provide IPv6 addresses for those devices. I also have an
IPv6 tunnel client on my notebook computer that gives it an IPv6 address
when on an IPv4 network. With the incredible number addresses¹, there
is no need for ISPs to use DHCP to conserve them. IPv6 also has built
in auto-configuration methods that make it unnecessary to rely on DHCP
for handing out host addresses and router info, though it is still used
for things like DNS addresses.
1. My /56 subnet is about a trillion times the entire IPv4 address space.
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