Ipv6 connection attempted before ipv4

Ruby
1

I’ve noticed that when using net/http, and probably with any ip/udp
socket connection, it attempts to connect via ipv6 and when that fails
it falls back to ipv4. Is this due to the underlying socket library
on freebsd, or is it a ruby issue? Both client and server are
freebsd.

Chris

2

On 10/29/06, snacktime [email protected] wrote:

I’ve noticed that when using net/http, and probably with any ip/udp
socket connection, it attempts to connect via ipv6 and when that fails
it falls back to ipv4. Is this due to the underlying socket library
on freebsd, or is it a ruby issue? Both client and server are
freebsd.

Forgot to mention this was when using ‘localhost’ instead of
127.0.0.1. For anyone else testing clients/servers on freebsd, don’t
use ‘localhost’, use 127.0.0.1. Freebsd limits RST packets to so many
per second, and it took me a little bit to figure out why my http
connections were hanging for a second after every 200. Not sure if
linux has the same behavior.

Chris

3

On 10/29/06, snacktime [email protected] wrote:

On 10/29/06, snacktime [email protected] wrote:

I’ve noticed that when using net/http, and probably with any ip/udp
socket connection, it attempts to connect via ipv6 and when that fails
it falls back to ipv4. Is this due to the underlying socket library
on freebsd, or is it a ruby issue?

Forgot to mention this was when using ‘localhost’ instead of
127.0.0.1. For anyone else testing clients/servers on freebsd, don’t
use ‘localhost’, use 127.0.0.1.

It has to do with the order of ‘localhost’ lines in the /etc/hosts file.

4

On 10/29/06, Garance A Drosehn [email protected] wrote:

It has to do with the order of ‘localhost’ lines in the /etc/hosts file.

Ah I didn’t even notice that. Makes sense now.