DHCP Static-Lease Configuration from Command-line

[gatorback]

I would like command-line ability to configure the static leases found at the tail:

http://Router_IP/Advanced_DHCP_Content.asp

It would look something like:

https://www.dd-wrt.com/wiki/index.php/Static_DHCP#How_to_add_static_leases_into_dhcp_by_command

1. Set the number of lease slots
2. Fill in the data for each lease slot

https://www.dd-wrt.com/wiki/index.php/Static_DHCP#How_to_add_static_leases_into_dhcp_by_command
I set one static lease and tried:

router:/tmp/home/root# nvram show | grep static
vpn_crt_server2_static=
vpn_crt_client1_static=
size: 47431 bytes (18105 left)
vpn_crt_client2_static=
vpn_crt_client3_static=
lan_proto=static
dhcp1_staticlist=
vpn_crt_client4_static=
dhcp_staticlist=<99:52:99:22:9D:5B>192.168.8.110>MyHostname
dhcp_static_x=1
vpn_crt_client5_static=
dhcp1_static_x=0
vpn_crt_server1_static=

I set a second static host


outer:/tmp/home/root# nvram show | grep static
vpn_crt_server2_static=
vpn_crt_client1_static=
vpn_crt_client2_static=
vpn_crt_client3_static=
dhcp1_staticlist=
lan_proto=static
vpn_crt_client4_static=
dhcp_staticlist=<99:52:99:22:9D:5B>192.168.8.110>MyHostnameF<99:02:AF:72:CA:5B>192.168.8.111>NextHostname
dhcp_static_x=1
vpn_crt_client5_static=
dhcp1_static_x=0
vpn_crt_server1_static=
size: 47479 bytes (18057 left)

My Google search was not successful and I hope that others have already published this info. I look forward to seeing how this is done. Thanks

 

[sfx2000]

This is probably as good of place to start as any - dnsmasq is the dhcpd that sets leases...

OpenWRT info - https://wiki.openwrt.org/doc/uci/dhcp

 

[john9527]

You need to restart dnsmasq to pick up the change,

service restart_dnsmasq

You'll probably also need to manually force the client to renew it's lease.

 

[RMerlin]

You need to restart dnsmasq:

service restart_dnsmasq

 

[gatorback]

This is probably as good of place to start as any - dnsmasq is the dhcpd that sets leases...

OpenWRT info - https://wiki.openwrt.org/doc/uci/dhcp

Thanks for putting me on the right-track. Is there a good example that's applicable to Merlin's 378.58 on an RT-AC78U: I would prefer to be certain that I am doing this correctly and avoid an accidental borking of other services (DNS, etc.) I'd also like to understand where this configuration information is stored (NVRAM?) Thanks

 

[ColinTaylor]

Thanks for putting me on the right-track. Is there a good example that's applicable to Merlin's 378.58 on an RT-AC78U: I would prefer to be certain that I am doing this correctly and avoid an accidental borking of other services (DNS, etc.) I'd also like to understand where this configuration information is stored (NVRAM?) Thanks

I wouldn't use that page as a guide if I were you. OpenWRT uses a different method to configure DNS/DHCP with a different syntax. It's better to look at: http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html

The ASUS uses the "normal" dnsmasq configuration file at /etc/dnsmasq.conf. The firmware builds this file (and others) based on NVRAM settings at boot time.

For example, look at options --addn-hosts (/etc/hosts.dnsmasq) and --read-ethers (/etc/ethers)