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How to have dedicated DHCP options bind to a specific SSID
As the following configuration is applied to a specific interface, you need to identify which interface / virtual interface your SSID is using, to do so you can use the following command:
nvram show | grep WiFiTest
Which should result something similar to:
wl0.2_ssid=WiFiTest size: 48528 bytes (17008 left) wl_ssid=WiFiTest
This example give us wl0.2 as the interface that we need to tweak.
Create the following file:
/jffs/scripts/dnsmasq.postconf
Give it the following permission:
chmod +xxx /jffs/scripts/dnsmasq.postconf
Its content should be:
#!/bin/sh CONFIG=$1 source /usr/sbin/helper.sh logger "dnsmasq-dhcp: Configure wl0.2 to have special DHCP" ifconfig wl0.2 172.30.20.2 netmask 255.255.255.0 iptables -D INPUT -i wl0.2 -j ACCEPT iptables -I INPUT -i wl0.2 -j ACCEPT ebtables -t broute -D BROUTING -i wl0.2 -p ipv4 -j DROP ebtables -t broute -I BROUTING -i wl0.2 -p ipv4 -j DROP pc_append " log-dhcp interface=wl0.2 dhcp-range=wl0.2,172.30.20.150,172.30.20.200,255.255.255.0,86400s dhcp-option=wl0.2,3,172.30.20.1 dhcp-option=wl0.2,6,8.8.8.8,8.8.4.4 " /tmp/etc/dnsmasq.conf
Feel free to customize the DHCP option and range.
You need to create this file to ensure the DHCP service is restarted after the WiFi interface have been mounted. Create the following file:
/jffs/scripts/services-start
Give it the following permission:
chmod +xxx /jffs/scripts/services-start
Its content should be:
#!/bin/sh service restart_dnsmasq
You can restart the dnsmasq server by doing service:
service restart_dnsmasq
It does avoid to reboot the router.
Also ensure your DHCP configuration have the following configuration:
log-dhcp
This last one produce more advance logs that could help you. Example:
available DHCP range: 172.30.20.2 -- 172.30.20.254 vendor class: MSFT 5.0 client provides name: Eric-PC DHCPREQUEST(br0) 172.30.20.231 00:ff:57:99:d8:98 tags: lan, br0 DHCPACK(br0) 172.30.20.231 00:ff:57:99:d8:98 Eric-PC requested options: 1:netmask, 15:domain-name, 3:router, 6:dns-server, requested options: 44:netbios-ns, 46:netbios-nodetype, 47:netbios-scope, requested options: 31:router-discovery, 33:static-route, 121:classless-static-route, requested options: 249, 252, 43:vendor-encap next server: 172.30.20.1 sent size: 1 option: 53 message-type 5 sent size: 4 option: 54 server-identifier 172.30.20.1 sent size: 4 option: 51 lease-time 1d sent size: 4 option: 58 T1 12h sent size: 4 option: 59 T2 21h sent size: 4 option: 1 netmask 255.255.255.0 sent size: 4 option: 28 broadcast 172.30.20.255 sent size: 14 option: 81 FQDN 03:ff:ff:45:72:69:63:2d:53:65:6b:6b:65:69 sent size: 1 option:252 0a sent size: 8 option: 6 dns-server 172.30.20.1, 172.30.20.1 sent size: 4 option: 3 router 172.30.20.1