IPV6 support was added to dnsmasq in version 1.2 according to official documentation, yet the stable dnsmasq ebuild (1.18) seems to encounter problems when used in conjunction with IPV6. I've included an strace of the problem. It should be noted that this problem does not exist in versions 2.0 or greater. (all marked unstable) Reproducible: Always Steps to Reproduce: 1. Have IPV6 enabled (in my case, modularized) 2. Attempt to run dnsmasq commandline or from init.d Actual Results: [root@halcyon ~]$ dnsmasq dnsmasq: failed to bind socket: No such device [root@halcyon ~]$ strace dnsmasq execve("/usr/sbin/dnsmasq", ["dnsmasq"], [/* 42 vars */]) = 0 uname({sys="Linux", node="halcyon", ...}) = 0 brk(0) = 0x8053000 open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory) mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40015000 open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=75019, ...}) = 0 mmap2(NULL, 75019, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40016000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 ]\1\000"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1302876, ...}) = 0 mmap2(NULL, 1241060, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40029000 mmap2(0x40152000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x128) = 0x40152000 mmap2(0x40156000, 8164, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40156000 close(3) = 0 munmap(0x40016000, 75019) = 0 open("/dev/urandom", O_RDONLY) = 3 read(3, "-N(\315\236~d\342\376A\26\344\260\323+0jM;z\333U\243#\22"..., 32) = 32 close(3) = 0 rt_sigaction(SIGUSR1, {0x8050310, [USR1], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 rt_sigaction(SIGUSR2, {0x8050310, [USR2], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 rt_sigaction(SIGHUP, {0x8050310, [HUP], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 brk(0) = 0x8053000 brk(0x8074000) = 0x8074000 brk(0) = 0x8074000 open("/etc/dnsmasq.conf", O_RDONLY) = -1 ENOENT (No such file or directory) socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3 ioctl(3, 0x8912, 0xbffff298) = 0 ioctl(3, 0x8912, 0xbffff298) = 0 ioctl(3, 0x8913, 0x8053a68) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4 setsockopt(4, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.15.43.130")}, 16) = 0 ioctl(3, 0x8913, 0x8053a88) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 5 setsockopt(5, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.42.1")}, 16) = 0 ioctl(3, 0x8913, 0x8053aa8) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 6 setsockopt(6, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(6, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")}, 16) = 0 close(3) = 0 open("/proc/net/if_inet6", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40016000 read(3, "fe800000000000000208c7fffe91ffa2"..., 1024) = 162 socket(PF_INET6, SOCK_DGRAM, 0) = 7 setsockopt(7, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(7, {sa_family=AF_INET6, sin6_port=htons(53), inet_pton(AF_INET6, "fe80::208:c7ff:fe91:ffa2", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=536870912}, 28) = -1 ENODEV (No such device) close(7) = 0 close(3) = 0 munmap(0x40016000, 4096) = 0 write(2, "dnsmasq: ", 9dnsmasq: ) = 9 write(2, "failed to bind socket: No such d"..., 37failed to bind socket: No such device) = 37 write(2, "\n", 1 ) = 1 time([1080217919]) = 1080217919 open("/etc/localtime", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=1267, ...}) = 0 mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40158000 read(3, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0"..., 131072) = 1267 close(3) = 0 munmap(0x40158000, 131072) = 0 rt_sigaction(SIGPIPE, {0x400fac60, [], SA_RESTORER, 0x400523f8}, {SIG_DFL}, 8) = 0 socket(PF_UNIX, SOCK_DGRAM, 0) = 3 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 connect(3, {sa_family=AF_UNIX, path="/dev/log"}, 16) = -1 EPROTOTYPE (Protocol wrong type for socket) close(3) = 0 socket(PF_UNIX, SOCK_STREAM, 0) = 3 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 connect(3, {sa_family=AF_UNIX, path="/dev/log"}, 16) = 0 send(3, "<10>Mar 25 07:31:59 dnsmasq: fai"..., 67, 0) = 67 rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0 time([1080217919]) = 1080217919 rt_sigaction(SIGPIPE, {0x400fac60, [], SA_RESTORER, 0x400523f8}, {SIG_DFL}, 8) = 0 send(3, "<10>Mar 25 07:31:59 dnsmasq: FAI"..., 48, 0) = 48 rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0 exit_group(1) = ? [root@halcyon /usr/portage/net-dns]$ dnsmasq dnsmasq: failed to bind socket: No such device [root@halcyon /usr/portage/net-dns]$ strace dnsmasq execve("/usr/sbin/dnsmasq", ["dnsmasq"], [/* 42 vars */]) = 0 uname({sys="Linux", node="halcyon", ...}) = 0 brk(0) = 0x8053000 open("/etc/ld.so.preload", O_RDONLY) = -1 ENOENT (No such file or directory) mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40015000 open("/etc/ld.so.cache", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=75019, ...}) = 0 mmap2(NULL, 75019, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40016000 close(3) = 0 open("/lib/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 ]\1\000"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1302876, ...}) = 0 mmap2(NULL, 1241060, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40029000 mmap2(0x40152000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x128) = 0x40152000 mmap2(0x40156000, 8164, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40156000 close(3) = 0 munmap(0x40016000, 75019) = 0 open("/dev/urandom", O_RDONLY) = 3 read(3, "\325\342\334\253n\205\243X/\227\241\207b\361\267bw2\224"..., 32) = 32 close(3) = 0 rt_sigaction(SIGUSR1, {0x8050310, [USR1], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 rt_sigaction(SIGUSR2, {0x8050310, [USR2], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 rt_sigaction(SIGHUP, {0x8050310, [HUP], SA_RESTORER|SA_RESTART, 0x400523f8}, {SIG_DFL}, 8) = 0 brk(0) = 0x8053000 brk(0x8074000) = 0x8074000 brk(0) = 0x8074000 open("/etc/dnsmasq.conf", O_RDONLY) = -1 ENOENT (No such file or directory) socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 3 ioctl(3, 0x8912, 0xbffff298) = 0 ioctl(3, 0x8912, 0xbffff298) = 0 ioctl(3, 0x8913, 0x8053a68) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4 setsockopt(4, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0 bind(4, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("69.15.43.130")}, 16) = 0 ioctl(3, 0x8913, 0x8053a88) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 5 device) = 37 write(2, "\n", 1 ) = 1 time([1080217947]) = 1080217947 open("/etc/localtime", O_RDONLY) = 3 fstat64(3, {st_mode=S_IFREG|0644, st_size=1267, ...}) = 0 mmap2(NULL, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40158000 read(3, "TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\0\4\0"..., 131072) = 1267 close(3) = 0 munmap(0x40158000, 131072) = 0 rt_sigaction(SIGPIPE, {0x400fac60, [], SA_RESTORER, 0x400523f8}, {SIG_DFL}, 8) = 0 socket(PF_UNIX, SOCK_DGRAM, 0) = 3 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 connect(3, {sa_family=AF_UNIX, path="/dev/log"}, 16) = -1 EPROTOTYPE (Protocol wrong type for socket) close(3) = 0 socket(PF_UNIX, SOCK_STREAM, 0) = 3 fcntl64(3, F_SETFD, FD_CLOEXEC) = 0 connect(3, {sa_family=AF_UNIX, path="/dev/log"}, 16) = 0 send(3, "<10>Mar 25 07:32:27 dnsmasq: fai"..., 67, 0) = 67 rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0 time([1080217947]) = 1080217947 rt_sigaction(SIGPIPE, {0x400fac60, [], SA_RESTORER, 0x400523f8}, {SIG_DFL}, 8) = 0 send(3, "<10>Mar 25 07:32:27 dnsmasq: FAI"..., 48, 0) = 48 rt_sigaction(SIGPIPE, {SIG_DFL}, NULL, 8) = 0 exit_group(1) = ? Expected Results: dnsmasq should return no output and background. lsmod demonstrating that the ipv6 module has been inserted. [root@halcyon ~]$ lsmod Module Size Used by ipt_TOS 2112 12 ipt_LOG 5472 0 ipt_REJECT 5792 4 ipt_pkttype 1472 2 ipt_state 1600 15 ip_nat_irc 3664 0 ip_nat_tftp 2896 0 ip_nat_ftp 4400 0 ip_conntrack_irc 70548 1 ip_nat_irc ip_conntrack_tftp 2996 0 ip_conntrack_ftp 71348 1 ip_nat_ftp ipt_multiport 1792 0 ipt_conntrack 2144 3 iptable_filter 2336 1 iptable_mangle 2272 1 iptable_nat 21444 4 ip_nat_irc,ip_nat_tftp,ip_nat_ftp ip_tables 17152 10 ipt_TOS,ipt_LOG,ipt_REJECT,ipt_pkttype,ipt_state,ipt_multiport,ipt_conntrack,iptable_filter,iptable_mangle,iptable_nat sg 31776 0 st 37944 0 md5 3776 1 ipv6 252320 22 rtc 11912 0
dnsmasq 2.x is now very usable, so I've marked 2.5 stable on x86 and amd64.
