Created
October 7, 2013 09:07
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Netcat testing 3306 tcp connexion
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| [root@centos mysql]# nc -vz localhost 3306 | |
| nc: connect to localhost port 3306 (tcp) failed: Connection refused | |
| Connection to localhost 3306 port [tcp/mysql] succeeded! | |
| The reason is the first connection is against ::1 (IPv6), and the second to 127.0.0.1. | |
| This could be seen with: tcpdump -i lo -n | |
| [root@centos mysql]# grep localhost /etc/hosts | |
| 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 | |
| ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 | |
| iptraf doesn't show this correctly, hidding the ipv6 connection under the ipv4 connection |
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