Arris TM502G, CMTS 1000 and Asterisk

Jus an FYI that the CMTS 1000 is 1.0 and will not allow for priotritization of VoIP traffic. Are you able to sell service with little to no QOS?

Just curious

I assume you are using your arris modem with sip firmware rather than using it with packet cable firmware (if your not then I know someone who has Asterisk working in Packetcable mode as well)

In order to work with Asterisk you need to add the following SNMP Mib setting to your cable modems config file

.1.3.6.1.4.1.4115.1.3.3.1.2.3.6.0 (aka arrisMtaDevProvMethod)

set it to 9 (aka gupiMacMta) which uses the mac address of the device as the MTA config file name i.e. 001122334455.bin

Obviously you will need the actual .bin file on your asterisk server.

This is very easy to do with Arris PacketAce software contact their support to get access to it if you do not have.

As far as dhcpd.conf goes

Here is my working sanitized dhcpd.conf file

# Define option 122
option space docsis-mta;
option docsis-mta.dhcp-server-1 code 1 = ip-address;
option docsis-mta.dhcp-server-2 code 2 = ip-address;
option docsis-mta.provision-server code 3 = { integer 8, string };
option docsis-mta.as-req-as-rep-1 code 4 = { integer 32, integer 32, integer 32 };
option docsis-mta.as-req-as-rep-2 code 5 = { integer 32, integer 32, integer 32 };
option docsis-mta.krb-realm-name code 6 = string;
option docsis-mta.tgs-util code 7 = integer 8;
option docsis-mta.timer code 8 = integer 8;
option docsis-mta.ticket-ctrl-mask code 9 = integer 16;
option docsis-mta-pkt code 122 = encapsulate docsis-mta;

# I globally set option 122 settings just in case
option docsis-mta.dhcp-server-1 192.168.2.40;
option docsis-mta.provision-server 0 "\003mta\006domain\003net\000";
option docsis-mta.krb-realm-name "\005BASIC\0011\000";

# Define a class for cable modems
# looks at the vendor-class-identifier for the string "docsis"
# spawn with option agent.remote-id; is used because the cmts is acting as a proxy for the dhcp request and if we used the mac it would be the CMTS mac not customer mac.
# only option 122 setting needed is dhcp-server-1 dhcp-server-2 is optional
# the modem config files are defined further down.
class "CM" {
match if substring(option vendor-class-identifier,0,6) = "docsis";
spawn with option agent.remote-id;
vendor-option-space docsis-mta;
default-lease-time 604800;
max-lease-time 604800;
min-lease-time 302400;
option time-offset -21600;
next-server 192.168.0.40;
option tftp-server-name "192.168.0.40";
option time-servers 192.168.0.33;
option log-servers 192.168.0.40;
option domain-name "mta.domain.net";
ddns-updates off;
option routers 10.1.6.1;
option subnet-mask 255.255.0.0;
option docsis-mta.dhcp-server-1 192.168.0.40;
}

# Define a class for MTAs
# looks at the vendor-class-identifier for the string "pktc1"
# spawn with option agent.remote-id; is used because the cmts is acting as a proxy for the dhcp request
# MTAs want FQDNs so first we set the domain name
# option domain-name "mta.domain.net";
# then we set the host name
# option host-name = host-decl-name; <- which is the mac address
# then you need to set the option 122 settings
# notably missing here is the other option 122 settings
# we use the Arris modems with sip firmware which have much of those settings in config files rather than dhcp.
class "MTA" {
match if substring(option vendor-class-identifier,0,5) = "pktc1";
spawn with option agent.remote-id;
default-lease-time 21600;
max-lease-time 21600;
min-lease-time 10800;
option domain-name "mta.domain.net";
ddns-updates off;
option domain-name-servers 66.218.245.13, 66.218.245.10;
option subnet-mask 255.255.0.0;
option routers 10.1.6.1;
option log-servers 192.168.0.40;
option time-servers 192.168.0.33;
option tftp-server-name "192.168.0.40";
next-server 192.168.0.40;
option time-offset -18000;
option host-name = host-decl-name;
option docsis-mta.provision-server 0 "\003mta\006domain\003net\000";
option docsis-mta.krb-realm-name "\005BASIC\0011\000";
}

# Define our servers subnet just so dhcpd knows about it
subnet 192.168.0.32 netmask 255.255.255.224 {
}

# now we setup our shared network
shared-network cableplant {
# this subnet is the one DHCP requests come accross to the server i.e. the IP of dhcp server is in this subnet
subnet 192.168.1.0 netmask 255.255.255.0 {
}
# This is our modem and mta pools
subnet 10.1.0.0 netmask 255.255.0.0 {
pool {
range 10.1.60.2 10.1.64.254;
allow members of "MTA";
deny unknown-clients;
}
pool {
range 10.1.65.2 10.1.69.254;
allow members of "CM";
deny unknown-clients;
}
}
}
# we use groups to define service levels for the modem
group BroadbandPlus {
filename "BroadbandPlus.bin";
option bootfile-name "BroadbandPlus.bin";
}

# We have a Voice only tier as well with the Ethernet disabled.
group VoipOnly {
filename "VoipOnly.bin";
option bootfile-name "VoipOnly.bin";
}

#here is what CM and MTA entries look like.
# these entries don't exist in our dhcpd.conf because
# we use OMAPI to update the dhcp server while it is running.
# but this is what they look like
## MTA
# nothing special except the mac address
host nh47ab20ee08ad7930 {
hardware ethernet 00:15:a4:85:15:0c;
}
## CM
# just need mac address
# and Group name for service level
host nh47a1fed108891ba0 {
hardware ethernet 00:15:a4:2b:31:4d;
group "BroadbandPlus";
}