Need IPv6 configuration help on CentOS 8

StarburstHost · 12-16-2020, 10:05 AM

Having a problem with getting the server to recognize the whole /64 IPv6 allocation.
This is on a CentOS 8 server.

IPV6INIT="yes"
IPV6ADDR="2605:a140:2045:8941::1/64"
IPV6_DEFAULTGW="fe80::1"
IPV6_DEFAULTDEV="eth0"
IPV6ADDR_SECONDARIES="2605:a140:2045:8941::2 2605:a140:2045:8941::3 2605:a140:2045:8941::4 2605:a140:2045:8941:0:30:40b7:f60d"

It won't recognize the whole /64, and using the IPV6ADDR_SECONDARIES isn't really an option.

Any help would be appreciated it.

Ser Olmy · 12-16-2020, 10:37 AM

What do you mean by "it won't recognize the whole /64?"

Surely, you don't expect the server to be assigned all 18,446,744,073,709,551,616 addresses in the subnet?

StarburstHost · 12-16-2020, 10:39 AM

Quote:

Originally Posted by Ser Olmy

What do you mean by "it won't recognize the whole /64?"

Surely, you don't expect the server to be assigned all 18,446,744,073,709,551,616 addresses in the subnet?

Would love to see the specs for a server that could handle that.
Thought some of the new servers do have 10Gbps ports.

But would like it to handle at least 100-200 that can be assigned to sites.

Ser Olmy · 12-16-2020, 12:35 PM

Web sites don't need dedicated IPs.

But if you want, say, 200 addresses, you'll actually have to put them in the config file manually. Just generate them with a command-line tool and paste them into the file. It won't look particularly good, but it'll work.

StarburstHost · 12-16-2020, 06:13 PM

Quote:

Originally Posted by Ser Olmy

Web sites don't need dedicated IPs.

But if you want, say, 200 addresses, you'll actually have to put them in the config file manually. Just generate them with a command-line tool and paste them into the file. It won't look particularly good, but it'll work.

Know of any such creature (IP list generator)?

I've searched and haven't found one that would spit out a list I could cut & paste.
Guess I could use Excel up to a point.

Ser Olmy · 12-16-2020, 11:25 PM

Quote:

Originally Posted by StarburstHost

Know of any such creature (IP list generator)?

Code:

seq 1 1 200 | xargs printf "2605:a140:2045:8941::%x "

StarburstHost · 12-16-2020, 11:52 PM

Know any other trick to manually add it to the IPV6ADDR_SECONDARIES?

Or just the cut & paste 1 very long line?

Ser Olmy · 12-17-2020, 12:09 AM

Cutting and pasting with the mouse will work just fine.

I guess you could use sed:

Code:

sed -i "s/IPV6ADDR_SECONDARIES=\"/IPV6ADDR_SECONDARIES=\"$(seq 1 1 200 | xargs printf "2605:a140:2045:8941::%x ")/" <filename>

Replace <filename> with the name of the configuration file.

StarburstHost · 12-17-2020, 09:20 AM

Quote:

Originally Posted by Ser Olmy

Cutting and pasting with the mouse will work just fine.

I guess you could use sed:

Code:

sed -i "s/IPV6ADDR_SECONDARIES=\"/IPV6ADDR_SECONDARIES=\"$(seq 1 1 200 | xargs printf "2605:a140:2045:8941::%x ")/" <filename>

Replace <filename> with the name of the configuration file.

Thanks, I'll give that a try.

I saw an example of:

IPV6ADDR_SECONDARIES="2605:a140:2045:8941::2 \
2605:a140:2045:8941::3 \
2605:a140:2045:8941::4 \
2605:a140:2045:8941:0:30:40b7:f60d"

But when I tried it, it didn't work. :\