[OpenWrt-Devel] [PATCH] [dnsmasq] support enforced start-IP, end-IP, netmask

[John Crispin]

try this

config dhcp 'roaming'
  option interface 'voyager'
  option netmask '255.255.255.0'
  option start 1
  option limit 253



On 14/10/2014 12:25, John Crispin wrote:
> On 09/10/2014 17:07, Bastian Bittorf wrote:
>> [dnsmasq] support enforced start-IP, end-IP, netmask
>>
>> there are corner cases where the "simple" setup via start/end/limit
>> option does not fit, in our case we need to hand out
>>
>> 192.168.2.1 ... 192.168.2.254 with a netmask of /24 but
>> the underlying interface has 192.168.0.1/16 so the smart
>> autodetection method of the init-script does not work.
>>
>> our section looks like:
>>
>> config dhcp 'roaming'
>>         option interface 'voyager'
>>         option force_netmask 255.255.255.0
>>         option force_startaddr 192.168.2.1
>>         option force_endaddr 192.168.2.254
>>
>> we use the setup for having an decentralized roaming
>> mechanism for an OLSR-mesh-network.
> Hi,
>
> this feature already exists. use the netmask option inside the dhcp section
>
>     John
>
>
>> Signed-off-by: Bastian Bittorf <bittorf at bluebottle.com>
>> ---
>>  package/network/services/dnsmasq/files/dnsmasq.init |    5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/package/network/services/dnsmasq/files/dnsmasq.init b/package/network/services/dnsmasq/files/dnsmasq.init
>> index 942acd7..3c0399b 100644
>> --- a/package/network/services/dnsmasq/files/dnsmasq.init
>> +++ b/package/network/services/dnsmasq/files/dnsmasq.init
>> @@ -406,6 +406,9 @@ dhcp_add() {
>>  	config_get leasetime "$cfg" leasetime
>>  	config_get options "$cfg" options
>>  	config_get_bool dynamicdhcp "$cfg" dynamicdhcp 1
>> +	config_get force_netmask "$cfg" force_netmask
>> +	config_get force_startaddr "$cfg" force_startaddr
>> +	config_get force_endaddr "$cfg" force_endaddr
>>  
>>  	leasetime="${leasetime:-12h}"
>>  	start="$(dhcp_calc "${start:-100}")"
>> @@ -413,7 +416,7 @@ dhcp_add() {
>>  	[ "$limit" -gt 0 ] && limit=$((limit-1))
>>  	eval "$(ipcalc.sh "${subnet%%/*}" $netmask $start $limit)"
>>  	if [ "$dynamicdhcp" = "0" ]; then END="static"; fi
>> -	xappend "--dhcp-range=$networkid,$START,$END,$NETMASK,$leasetime${options:+ $options}"
>> +	xappend "--dhcp-range=$networkid,${force_startaddr:-$START},${force_endaddr:-$END},${force_netmask:-$NETMASK},$leasetime${options:+ $options}"
>>  
>>  	dhcp_option_add "$cfg" "$networkid"
>>  }
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