Tag Archives: docsis

Configuring DHCP+TFTP for DOCSIS

Recently, it was necessary to configure the issuance of IP addresses to several old DOCSIS modems and the host located after the modem.
At hand was the Arris Cadant C3 and Thomson TCM-420 modems.

First of all, let’s start a DHCP server that will issue IP addresses to modems, for example, as I described in this article – Installing and configuring isc-dhcp-server.
And also we will launch a TFTP server on which there will be files for modems, for example, as I described in the article – Installing and Configuring a TFTP Server

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Script backup configuration DOCSIS ARRIS Cadant C3 CMTS

Actually, this is my script:

#!/bin/bash
# Backup DOCSIS CADANTS config
(
sleep 5
echo "user"
sleep 5
echo "password"
sleep 5
echo "enable"
sleep 2
echo "password"
sleep 2
echo "copy startup-configuration tftp://192.168.0.1/cadant1.xml"
sleep 5
echo "exit"
) | telnet 192.168.0.50
mv /srv/tftp/cadant1.xml /backups/devices/docsis/`date +%Y-%m-%d`_cadant1.xml

Where 192.168.0.50 – cadant, 192.168.0.1 – tftp server.

You can add the script to /etc/crontab for automatic execution (for example, every day at one in the morning):

0 1 * * * root /path/to/script/backup_cadants.sh > /dev/null 2>&1