-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 El 2023-03-01 a las 08:46 +0100, Per Jessen escribió:
Carlos E. R. wrote:
Ok, all good. But http://checkip.dns24.ch/ does not report both addresses.
It cannot - seen from the server, a client only ever has one address.
Right, I did not think of that.
when a client (e.g. your browser) connects to http://checkip.dns24.ch/, it does a lookup (getaddrinfo) of "checkip.dns24.ch", which will return two addresses. You can check that with "host checkip.dns24.ch". Depending on your setup, your browser will attempt a connection to _one_ of those. That connection will come from a client address that is suitable for the destination. On a typical system with IPv6, it will prefer to use the IPv6 address, and the connecttion will come from an IPv6 address.
Sure, it is obvious. Ok, then the "solution" would be to have two check IP sites: one that the server is on IPv4, and another where the server is on IPv6 :-) Before the ISP changed my router, I obtained my external IP doing a telnet to my router and asking. But current router does not respond to commands. Not even to "?" or "help". Looking at my old "expect" script, I see I did "wan show". Let's try that on new router... Woah, it works! :-O cer@Telcontar:~/tmp> ssh 1234@router.valinor ... Offending key for IP in /home/cer/.ssh/known_hosts:103 Are you sure you want to continue connecting (yes/no)? yes 1234@router.valinor's password: fail to read file > wan show VCC Con. Service Interface Proto. IGMP Src? MLD Src? Status IP ID Name Name address N/A 2 3 veip0.2 IPoE Disable Disable Disable Disable Connected 10.22.74.68 N/A 3 2 veip0.3 IPoE Enable Enable Disable Disable Connected 10.195.97.231 N/A 1 6 ppp0.1 PPPoE Disable Disable Disable Disable Connected 79... sshd:error:359.628:cli_wanShowServices:1533:unknown or unsupported WAN access type X_BROADCOM_COM_L2TPAC
? help quit
Bye bye. Have a nice day!!! Connection to router.valinor closed. cer@Telcontar:~/tmp> Ok, so now that I modified my script to use an external web site for checking, I can keep that, or change again to using telnet or ssh. Huh, telnet doesn't answer, although the port is open: cer@Telcontar:~/tmp> nmap router.valinor Starting Nmap 7.92 ( https://nmap.org ) at 2023-03-01 12:23 CET Nmap scan report for router.valinor (192.168.1.1) Host is up (0.031s latency). Not shown: 994 closed tcp ports (conn-refused) PORT STATE SERVICE 21/tcp filtered ftp 22/tcp open ssh 23/tcp filtered telnet 80/tcp open http 443/tcp open https 5431/tcp open park-agent Nmap done: 1 IP address (1 host up) scanned in 3.54 seconds cer@Telcontar:~/tmp> No, not open, filtered. - -- Cheers, Carlos E. R. (from openSUSE 15.4 x86_64 at Telcontar) -----BEGIN PGP SIGNATURE----- iHoEARECADoWIQQZEb51mJKK1KpcU/W1MxgcbY1H1QUCY/82Ahwccm9iaW4ubGlz dGFzQHRlbGVmb25pY2EubmV0AAoJELUzGBxtjUfVsFoAn0mTlVN8L+ZpIj5aBXzv MdpUbjhfAJ92cFX3WLrDnI8f9sBgUaMv6+5cUQ== =jc+E -----END PGP SIGNATURE-----