How to define LAST_OCTET?

To define the LAST_OCTET variable in your Bash script, you simply assign it a value that represents the last octet of the IP address you want to use. Here's how you can do it:

Example Definition:

If your IP address is 192.168.1.1, the last octet is 1. You can define it like this:

LAST_OCTET=1

Complete Example:

Here’s how you can incorporate it into your script:

# Define the last octet
LAST_OCTET=1  # Change this to the desired last octet

# Define the reverse IP (for example, for 192.168.1.1, it would be 1.1.168.192)
REV_IP=1.168.192  # Change this to match your network

# Create the DNS zone file
sudo bash -c "cat > /etc/bind/db.${REV_IP}" << EOF
\$TTL    604800
@       IN      SOA     ns1.mylocaldomain.net. admin.mylocaldomain.net. (
                     $(date +%Y%m%d)01 ; Serial
                             604800     ; Refresh
                              86400     ; Retry
                            2419200     ; Expire
                             604800 )   ; Negative Cache TTL
;
@       IN      NS      ns1.mylocaldomain.net.
;
${LAST_OCTET}     IN      PTR     ns1.mylocaldomain.net.
${LAST_OCTET}     IN      PTR     webserver.mylocaldomain.net.
${LAST_OCTET}     IN      PTR     fileserver.mylocaldomain.net.
EOF

Notes:

• Make sure to replace 1 in LAST_OCTET=1 with the actual last octet of the IP address you are configuring.
• Similarly, adjust REV_IP to reflect the reverse IP format corresponding to your network.

If you have any more questions or need further assistance, feel free to ask!