windows machine gets assigned wrong netmask

Question

I have a Debian based DHCP server. It assigns correct netmask 225.225.225.0 for all devices (WiFi router, voip, scanner) except for the windows machines. They all get assigned 224.0.0.0 for some reason. They are all set to receive IP over DHCP; no manipulations with routing tables was done. Why do they get configured this way?

Settings of the isc-dhcp-server:

option domain-name "example.com";
option domain-name-servers 8.8.8.8, 8.8.4.4;
option subnet-mask 255.255.255.0;

default-lease-time 600;
max-lease-time 7200;

ddns-update-style none;

subnet 192.168.1.0 netmask 255.255.255.0 {
  option routers 192.168.1.1;
  option subnet-mask    225.225.225.0;
  range 192.168.1.20 192.168.1.200;
}

host gnulinuxpc {
  hardware ethernet 00:30:48:b8:52:cb;
  fixed-address 192.168.1.2;
  option subnet-mask    225.225.225.0;
}

host windowspc {
  hardware ethernet 00:18:f3:5e:bb:d3;
  fixed-address 192.168.1.3;
  option subnet-mask    225.225.225.0;
}

Do Windows clients get correct IP addresses? I mean, it's just the netmask what clients get an incorrect one.. — Humberto Castellon, Nov 06 '18 at 15:04
GregAskew - seeing as how you answered this, why not put this as a proper answer... :) — Stese, Nov 06 '18 at 15:47

score 5 · Accepted Answer · answered Nov 06 '18 at 16:14

5

Probably a typo: option subnet-mask 225.225.225.0; Not a valid mask :-)

answered Nov 06 '18 at 16:14

Greg Askew

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windows machine gets assigned wrong netmask

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