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Old 01-13-2022, 09:52 AM   #1
Bashed
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Registered: Jul 2015
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BIND Script


For Linux o/s where I assign a large quantity of IPv4 addresses, I use a simple bind script to quickly bind all IPs.

Example:

Code:
for i in $(seq 2 254);
    do
        ip addr add xxx.142.100.$i/24 dev eth0
        ip addr add xxx.142.101.$i/24 dev eth0
        ip addr add xxx.142.102.$i/24 dev eth0
        ip addr add xxx.142.103.$i/24 dev eth0        
    done

ip addr show
Is there an easier way to do a single line for whatever size subnet?

Say for example I want to bind a full straight /19 to the server. I cannot do for example...

ip addr add xxx.142.101.$i/19 dev eth0

...because of the sequence line.

Is there an alternative to this?

Last edited by Bashed; 01-13-2022 at 10:17 AM.
 
Old 01-14-2022, 01:27 PM   #2
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Anyone?
 
Old 01-29-2022, 12:18 AM   #3
beka
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Registered: Dec 2021
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Hi Bashed,

If I understood correctly, you also want to generate the 3rd octet of the ip addresses. You can use a double loop like:

---------------------------------------------------------

for i in $(seq 0 31);
do
for j in $(seq 2 254);
do
ip addr add xxx.142.$i.$j/24 dev eth0
done
done


ip addr show

---------------------------------------------------------

This will generate 31 x 254 = 7874 virtual interfaces!


Cheers!

Last edited by beka; 01-29-2022 at 12:19 AM.
 
  


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