I'm trying to set up a CMTS to use DHCP Relay for CPE and cable modem devices
pointing towards a Mikrotik 450G. The CMTS provides two options for choosing a
private subnet for the cable modems and a different subnet for CPE. DHCP option
118 or DHCP option 82.
DHCP options 118 includes as it's payload, the subnet as hex. Example for MT
Log: Unknown(118) C0-A8-13-00 which would be subnet 192.168.19.0. According
to the RFC for option 118, DHCP servers should choose the subnet that matches
the argument of the option with it's dhcp offer and include the option back in
the reply. How can you do this with a Mikrotik? Is it even possible? I'm
running into issues using option 82 instead as well. What am I missing?
This is the config I've been trying without success.
/ip dhcp-server
add address-pool=CPE-Pool authoritative=yes bootp-support=static disabled=no \
interface=bridge lease-time=3d name=CPE-DHCP relay=192.168.1.1
/ip dhcp-server option
add code=118 name=CM-118 value=C0-A8-13-00
add code=118 name=CPE-118 value=""
/ip dhcp-server lease
add address=CM-Pool client-id=1:3c:75:4a:33:34:62 comment="" disabled=no \
mac-address=3C:75:4A:33:34:62 server=CPE-DHCP
/ip dhcp-server network
add address=192.168.1.0/24 comment="" dhcp-option=CPE-118 gateway=192.168.1.254
add address=192.168.19.0/24 comment="" dhcp-option=CM-118 gateway=192.168.19.254
/ip pool
add name=CPE-Pool ranges=192.168.1.2-192.168.1.253
add name=CM-Pool ranges=192.168.19.1-192.168.19.253
/ip address
add address=192.168.1.254/24 broadcast=192.168.1.255 comment="" disabled=no \
interface=bridge network=192.168.1.0
add address=192.168.19.254/24 broadcast=192.168.19.255 comment="" disabled=no \
interface=bridge network=192.168.19.0
Justin
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