View source for Network Configuration / DHCP General Options Network Mask

= Description =
DHCP general option network mask is modified automatically when modifying the eth1 network configuration.

= Context =

IPBRICK network configuration is tightly connected to the DHCP and DNS services, so when modifying the network configuration at Advanced Configurations - IPBRICK - Definitions, one must expect that every service configuration should be adjusted automatically in accordance with the network modifications operated.

Meanwhile there is a known issue with the DHCP service so you are recommended to check, verify and if necessary adjust the specific configuration of your DHCP server.

= Scenario =
Here we present a known scenario (example) with the description of the issue detected:
* scenario before any modification
** eth0
*** address: 192.168.130.1 / 24 (mask)
*** network: 192.168.130.0
*** broadcast: 192.168.130.255
** eth1
*** address: 192.168.2.1 / 24 (mask)
*** network: 192.168.2.0
*** broadcast: 192.168.2.255
** gateway
*** eth1
*** 192.168.2.254
** DHCP - General Options
*** Network Mask: 255.255.255.0

Now we are going to modify the network configuration of the eth1 interface, this is exclusively the only modification that we will be doing:
* modifying eth1 and gateway
** eth1
*** address: 72.29.87.114 / 29 (mask)
*** network: 72.29.87.112
*** broadcast: 72.29.87.119
** gateway
*** eth1
*** 72.29.87.113

Now if you check the DHCP - General Options you will find that the Network Mask was modified automatically to "255.255.255.248".

Please adjust to the desired value of "255.255.255.0".

= Solution =
When modifying the network configuration of any network interface card (eth0, eth1, eth2, ...) please check and if necessary adjust the settings of the DHCP server.

Advanced Configurations - Support Services - DHCP - Subnets : General Options