[OpenIndiana-discuss] OpenSolaris and dynamic DNS
gary at genashor.com
Wed Feb 9 12:29:10 UTC 2011
On 2/9/11 5:56 AM, Matt Connolly wrote:
> On 08/02/2011, at 6:16 AM, Gary Gendel wrote:
>> Thanks for all the responses. Indeed, I've already replaced my cron script.
>> On 2/7/11 11:08 AM, Dave Miner wrote:
>>> On 02/ 7/11 10:43 AM, Gary Gendel wrote:
>>>> Something that someone mentioned in passing triggered a thought.
>>>> My server gets it's ip address via DHCP from my ISP. Currently I have a
>>>> cron job that queries the address and, if it changed, update a DNS
>>>> server externally. This way I can use mail and web services external to
>>>> my network.
>>>> Can I replace the cron job with a trigger from the dhcp client when it
>>>> gets a new IP address instead? Is this possible with the current dhcp
>>>> client or a replacement?
>>> dhcpagent(1M) describes the eventhook mechanism built into the DHCP client. It's meant for exactly these sorts of uses.
> That's good to know. I've been using "ddclient-3.7.3" for many months now on a cron schedule. In my case though, I have a router which gets the dynamic IP address and uses port mapping to expose only specific ports of my server to the internet, so I don't think I can make use of that at present...
I had a similar setup for many many years. About 4 months ago my ZyWall
router was showing it's age with a lot of "NAT table full" messages and
it would get knocked offline often. Because my Sunfire V20z had dual
NICS, I set it up as my firewall/NAT/router plus a DHCP server which is
why this option became feasible. I haven't looks back at the ZyWall
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