Myra Sewitz asked:
i have ipv4 and ipv6 addresses on my network card, when i send a request with curl i want only the respective ipv4 or ipv6 to be used and no fallback e.g. from ipv6 to ipv4 takes place.
curl --interface XXXX: c020: XXXX: e601: XXXX: 596c: XXXX: db97 http://ip4only.me/api/ curl: (45) bind failed with errno 22: Invalid argument curl -x http: // [2603: XXXX: 8003: e601: XXXX: 596c: XXXX: db97]: 8080 http://ip4only.me/api/ IPv4,130.XX.XXX.81
I would like to receive an error if the site only accepts ipv4 addresses as with the –interface variant.
ipv4 forwarding is switched off.
ubuntu @ app-1: ~ $ sudo grep -r ip_forward / etc /etc/ufw/sysctl.conf:#net/ipv4/ip_forward=1 /etc/sysctl.conf:#net.ipv4.ip_forward=1
apparently a forwarding takes place anyway when I send it with a port.
please help me
You can override which IP protocol stack is used with the
-6 options, which restrict it to IPv4 or IPv6 respectively. Consider:
$ curl -6 http://ip4only.me/api/ curl: (6) Could not resolve host: ip4only.me $ curl -4 http://ip4only.me/api/ IPv4,198.51.100.84,Remaining fields reserved for future use,,,
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