Package: ntpdate Version: 1:4.2.0a+stable-2 Severity: normal
ntpdate fails to query a NTP server when the server's hostname resolves to both IPv6 and IPv4 addresses, if the client has ipv6 kernel module loaded but no IPv6 connectivity. As specified per RFC 2553, it should fallback to using IPv4 if IPv6 fails, all the more as it uses getaddrinfo() to resolve the server's address: # ntpdate -q ntp.via.ecp.fr 5 Feb 20:46:12 ntpdate[10069]: sendto(krishna.via.ecp.fr): Network is unreachable 5 Feb 20:46:13 ntpdate[10069]: sendto(krishna.via.ecp.fr): Network is unreachable 5 Feb 20:46:14 ntpdate[10069]: sendto(krishna.via.ecp.fr): Network is unreachable 5 Feb 20:46:15 ntpdate[10069]: sendto(krishna.via.ecp.fr): Network is unreachable server 2002:8ac3:802d:1242:204:e2ff:fe10:5c44, stratum 0, offset 0.000000, delay 0.00000 5 Feb 20:46:16 ntpdate[10069]: no server suitable for synchronization found When specifying a IPv4-only hostname, it works fine: # ntpdate -q ntp.ipv4.via.ecp.fr server 138.195.130.71, stratum 2, offset 0.024067, delay 0.02591 5 Feb 20:46:19 ntpdate[10070]: adjust time server 138.195.130.71 offset 0.024067 sec Below are the DNS entries involved: # host -t any ntp.via.ecp.fr ntp.via.ecp.fr is an alias for krishna.via.ecp.fr. # host -t any krishna.via.ecp.fr krishna.via.ecp.fr has address 138.195.130.71 krishna.via.ecp.fr has AAAA address 2002:8ac3:802d:1242:204:e2ff:fe10:5c44 -- System Information: Debian Release: 3.1 APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing') Architecture: i386 (i686) Kernel: Linux 2.6.10 Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8) Versions of packages ntpdate depends on: ii libc6 2.3.2.ds1-20 GNU C Library: Shared libraries an -- debconf information: * shared/ntp/servers: ntp.via.ecp.fr -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
