configuring a whole /24 on one interface

Skaperen · 05-13-2020, 05:15 PM

is there a way to configure an interface to use (respond to ARP requests) all 256 IP addresses of a /24 that has been assigned to my server? i would otherwise have to configure 255 individual alias interfaces with each IP.

berndbausch · 05-14-2020, 02:25 PM

Code:

for addr in {1..254}
do ip a add 192.168.1.${addr}/24 dev eth1
done

Didn't try it though.

smallpond · 05-14-2020, 02:30 PM

Quote:

Originally Posted by berndbausch

Code:

for addr in {1..254}
do ip a add 192.168.1.${addr}/24 dev eth1
done

Didn't try it though.

Probably a good idea to remove your gateway IP from that list.

jefro · 05-14-2020, 02:57 PM

Static arp entry comes to mind but I've never tried that exactly. Seems like a very bad idea.

Skaperen · 05-15-2020, 06:47 PM

the network mask is larger like /10. i just get a whole /24 out of it. the gateway is not within my /24. i have no intention to configure lots of individual IPs. BTDT. the system did not crash but networking was slower. i just have 2 IPs configured there, now, with 1 of them NATted to a public IP.

berndbausch · 05-15-2020, 08:24 PM

Quote:

Originally Posted by Skaperen

i have no intention to configure lots of individual IPs.

and in the original posting:

Quote:

configure an interface to use (respond to ARP requests) all 256 IP addresses of a /24

I am afraid your two requirements are incompatible.

Skaperen · 05-16-2020, 02:43 PM

Quote:

Originally Posted by berndbausch

I am afraid your two requirements are incompatible.

read my original question.

instead of 256 individual IPs (/32 each) configured i am wanting to configure just one, 100.77.58.0/24.