[Merlin] Dual DDNS possible?

[brambil]

I run AsusWRT Merlin 384.3 on an RT-AC68U, using NO-IP as DDNS.

Is possible add another ddns, I would like to add also duckdns without dismissing no-ip service.

 

[RMerlin]

Either manually handle it through a custom DDNS script (see the Wiki for details), or look at DNS-o-Matic, which is able to update multiple DDNS services at once.

 

[JDB]

I have a custom script doing 2, one for IPv4 and one for IPv6.
It’s pretty simple to merge 2 examples from the wiki and with a bit of googling if no example exists for your chosen service (assuming you have basic Linux skills)


Sent from my iPhone using Tapatalk

 

[brambil]

Finally, I decided for a cronjob, http://www.duckdns.org/install.jsp

I will test, if this service works well in next months I'll substitute no-ip and it's annoying months renewal.

 

[peraburek]

you can use duckdns.org through http://dnsomatic.com which is supported in Asus DDNS options

 

[DigitizedMe]

@JDB , can you share your script?

So far it looks like there are two limitations for my dual stack ipv4/ipv6 DNS record renewal:

1. inadyn doesn't support ipv6 yet:
https://github.com/troglobit/inadyn/issues/52

2. Google Domains doesn't allow two dynamic DNS records (A and AAAA) for the same hostname:
https://www.reddit.com/r/homelab/comments/7b6jgq/how_do_i_get_one_dns_hostname_to_point_to_an_ipv4/

Once we get past these limitations, I think it will be as easy as adding the parameter : (checkip-command = "/bin/nvram get ipv6_wan_addr") to another provider config in the /jffs/configs/inadyn.conf.add file.

 

[JDB]

Probably the ugliest script ever made. Literally copied/pasted the contents of the dnsomatic and dynv6 scripts into 1!

Update all the variables with the 'your_' prefix in the contents with the info applicable to your DDNS login. Of course this only works with dnsomatic and dynv6!!

#!/bin/sh -e
 
sleep 60

# Update the following variables:
USERNAME="your_username"
PASSWORD="your_password"
HOSTNAME="your_ipv4_hostname"

# Should be no need to modify anything beyond this point
/usr/sbin/curl -k --silent "https://$USERNAME:$PASSWORD@updates.dnsomatic.com/nic/update?hostname=$HOSTNAME&wildcard=NOCHG&mx=NOCHG&backmx=NOCHG&myip=" > /dev/null
if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi
token="your_token"
hostname="your_ipv6_hostname"
device=br0
file=$HOME/.dynv6.addr6
[ -e $file ] && old=`cat $file`

if [ -z "$hostname" -o -z "$token" ]; then
  echo "Usage: token=<your-authentication-token> [netmask=64] $0 your-name.dynv6.net [device]"                                                                                                                                                         
  exit 1
fi

if [ -z "$netmask" ]; then
  netmask=128
fi

if [ -n "$device" ]; then
  device="dev $device"
fi
address=$(ip -6 addr list scope global $device | grep -v " fd" | sed -n 's/.*inet6 \([0-9a-f:]\+\).*/\1/p' | head -n 1)

if [ -e /usr/sbin/curl ]; then
  bin="curl -fsS"
elif [ -e /usr/sbin/wget ]; then
  bin="wget -O-"
else
  echo "neither curl nor wget found"                                                                                                                                                                                                                   
  exit 1
fi

if [ -z "$address" ]; then
  echo "no IPv6 address found"                                                                                                                                                                                                                         
  exit 1
fi

# address with netmask                                                                                                                                                                                                                                 
current=$address/$netmask

if [ "$old" = "$current" ]; then
  echo "IPv6 address unchanged"                                                                                                                                                                                                                         
  exit
fi

# send addresses to dynv6                                                                                                                                                                                                                               
$bin "http://dynv6.com/api/update?hostname=$hostname&ipv6=$current&token=$token"
if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi
$bin "http://ipv4.dynv6.com/api/update?hostname=$hostname&ipv4=auto&token=$token"
if [ $? -eq 0 ]; then
  /sbin/ddns_custom_updated 1
else
  /sbin/ddns_custom_updated 0
fi


# save current address                                                                                                                                                                                                                                 
echo $current > $file

 

[DigitizedMe]

Thanks for the share!

This would help me jump over the inadyn IPv6 hurdle! If I used your script, I'd be pushing the IPv6 address to a different domain name though (mysite).dynv6.net. For my case, I want to update the same hostname with an A and AAAA record from my dual stack config. I'm still limited by Google Domains. :/

I'll probably just stick with inadyn and use IPv4 for now.

I've subscribed to the GitHub threads for troglobit/inadyn:

https://github.com/troglobit/inadyn/issues/52
https://github.com/troglobit/inadyn/pull/224

and the fork acolomb/inadyn:.

https://github.com/acolomb/inadyn/blob/ipv6-planning/IDEAS-IPv6.md

I wonder who will be first to be fully compatible with IPv4/IPv6 DDNS dual resolution. The small open source hobbyist community, or the corporate giant. Too bad I need both to work...or at least Google Domains with your script.

 

[sanke1]

@DigitizedMe Any update on this?

My ISP might go for IPv4 CG-NAT and IPv6 Dynamic setup in few months. So I would need IPv6 DDNS service to access CCTV cameras and remote desktop services.