[Petter Reinholdtsen]
> I do not know. ping6 is installed, but the command fail. This is
> the output from ping6:
>
> root@tjener:~# ping6 fe80::5652:ff:fe1f:e659
> connect: Invalid argument
> root@tjener:~#
Ah, wrong argument. I know why it fail now. check_ping uses NSS to
look up the hostname, while ping6 uses DNS.
root@tjener:~# ping6 tjener.intern
unknown host
root@tjener:~#
And NSS and DNS do not agree in this case, causing ping6 to fail when
called from check_ping.
Here is the strace:
root@tjener:~# strace ping6 tjener.intern
execve("/bin/ping6", ["ping6", "tjener.intern"], [/* 23 vars */]) = 0
brk(0) = 0x9fbc000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e7000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=117803, ...}) = 0
mmap2(NULL, 117803, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb76ca000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/i686/cmov/libresolv.so.2", 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\0P&\0\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=71488, ...}) = 0
mmap2(NULL, 79944, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb76b6000
mmap2(0xb76c6000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10) = 0xb76c6000
mmap2(0xb76c8000, 6216, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb76c8000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/usr/lib/i386-linux-gnu/i686/cmov/libcrypto.so.1.0.0", 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\200\217\4\0004\0\0\0"..., 512)
= 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1812104, ...}) = 0
mmap2(NULL, 1828080, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb74f7000
mprotect(0xb769a000, 4096, PROT_NONE) = 0
mmap2(0xb769b000, 98304, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a3) = 0xb769b000
mmap2(0xb76b3000, 9456, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb76b3000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/i686/cmov/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\240o\1\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1437864, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb74f6000
mmap2(NULL, 1452408, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb7393000
mprotect(0xb74ef000, 4096, PROT_NONE) = 0
mmap2(0xb74f0000, 12288, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15c) = 0xb74f0000
mmap2(0xb74f3000, 10616, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb74f3000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/i686/cmov/libdl.so.2", 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`\n\0\0004\0\0\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=9844, ...}) = 0
mmap2(NULL, 12408, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb738f000
mmap2(0xb7391000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1) = 0xb7391000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/libz.so.1", 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\320\33\0\0004\0\0\0"..., 512)
= 512
fstat64(3, {st_mode=S_IFREG|0644, st_size=95896, ...}) = 0
mmap2(NULL, 98556, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) =
0xb7376000
mmap2(0xb738d000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16) = 0xb738d000
close(3) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb7375000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb73758d0, limit:1048575,
seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,
useable:1}) = 0
mprotect(0xb738d000, 4096, PROT_READ) = 0
mprotect(0xb7391000, 4096, PROT_READ) = 0
mprotect(0xb74f0000, 8192, PROT_READ) = 0
mprotect(0xb769b000, 61440, PROT_READ) = 0
mprotect(0xb76c6000, 4096, PROT_READ) = 0
mprotect(0xb7706000, 4096, PROT_READ) = 0
munmap(0xb76ca000, 117803) = 0
socket(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6) = 3
getuid32() = 0
setuid32(0) = 0
socket(PF_NETLINK, SOCK_RAW, 0) = 4
bind(4, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0
getsockname(4, {sa_family=AF_NETLINK, pid=29504, groups=00000000}, [12]) = 0
time(NULL) = 1366629539
sendto(4, "\24\0\0\0\26\0\1\3\243\34uQ\0\0\0\0\0\0\0\0", 20, 0,
{sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20
recvmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"0\0\0\0\24\0\2\0\243\34uQ@s\0\0\2\10\200\376\1\0\0\0\10\0\1\0\177\0\0\1"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 168
recvmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"@\0\0\0\24\0\2\0\243\34uQ@s\0\0\n\200\200\376\1\0\0\0\24\0\1\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 128
recvmsg(4, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000},
msg_iov(1)=[{"\24\0\0\0\3\0\2\0\243\34uQ@s\0\0\0\0\0\0\1\0\0\0\24\0\1\0\0\0\0\0"...,
4096}], msg_controllen=0, msg_flags=0}, 0) = 20
close(4) = 0
brk(0) = 0x9fbc000
brk(0x9fdd000) = 0x9fdd000
getpid() = 29504
open("/etc/resolv.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=186, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e6000
read(4, "# Dynamic resolv.conf(5) file fo"..., 4096) = 186
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb76e6000, 4096) = 0
socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 4
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1
ECONNREFUSED (Connection refused)
close(4) = 0
socket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 4
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"}, 110) = -1
ECONNREFUSED (Connection refused)
close(4) = 0
open("/etc/nsswitch.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=692, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e6000
read(4, "# /etc/nsswitch.conf\n#\n# Example"..., 1024) = 692
read(4, "", 1024) = 0
close(4) = 0
munmap(0xb76e6000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=117803, ...}) = 0
mmap2(NULL, 117803, PROT_READ, MAP_PRIVATE, 4, 0) = 0xb76ca000
close(4) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/i686/cmov/libnss_files.so.2", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0P\32\0\0004\0\0\0"...,
512) = 512
fstat64(4, {st_mode=S_IFREG|0644, st_size=42628, ...}) = 0
mmap2(NULL, 45768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) =
0xb7369000
mmap2(0xb7373000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x9) = 0xb7373000
close(4) = 0
mprotect(0xb7373000, 4096, PROT_READ) = 0
munmap(0xb76ca000, 117803) = 0
open("/etc/host.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=9, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e6000
read(4, "multi on\n", 1024) = 9
read(4, "", 1024) = 0
close(4) = 0
munmap(0xb76e6000, 4096) = 0
open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=295, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e6000
read(4, "127.0.0.1 localhost.locald"..., 1024) = 295
read(4, "", 1024) = 0
close(4) = 0
munmap(0xb76e6000, 4096) = 0
open("/etc/ld.so.cache", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=117803, ...}) = 0
mmap2(NULL, 117803, PROT_READ, MAP_PRIVATE, 4, 0) = 0xb76ca000
close(4) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/i386-linux-gnu/i686/cmov/libnss_dns.so.2", O_RDONLY) = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0\f\0\0004\0\0\0"...,
512) = 512
fstat64(4, {st_mode=S_IFREG|0644, st_size=22088, ...}) = 0
mmap2(NULL, 20612, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0) =
0xb7363000
mmap2(0xb7367000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0x4) = 0xb7367000
close(4) = 0
mprotect(0xb7367000, 4096, PROT_READ) = 0
munmap(0xb76ca000, 117803) = 0
stat64("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=186, ...}) = 0
open("/etc/resolv.conf", O_RDONLY) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=186, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xb76e6000
read(4, "# Dynamic resolv.conf(5) file fo"..., 4096) = 186
read(4, "", 4096) = 0
close(4) = 0
munmap(0xb76e6000, 4096) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
gettimeofday({1366629539, 799916}, NULL) = 0
poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
send(4, "\t\370\1\0\0\1\0\0\0\0\0\0\6tjener\6intern\0\0\34\0\1", 31,
MSG_NOSIGNAL) = 31
poll([{fd=4, events=POLLIN}], 1, 5000) = 1 ([{fd=4, revents=POLLIN}])
ioctl(4, FIONREAD, [72]) = 0
recvfrom(4, "\t\370\205\200\0\1\0\0\0\1\0\0\6tjener\6intern\0\0\34\0\1\300"...,
1024, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, [16]) = 72
close(4) = 0
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
gettimeofday({1366629539, 800807}, NULL) = 0
poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}])
send(4, "\301\4\1\0\0\1\0\0\0\0\0\0\6tjener\6intern\6inter"..., 38,
MSG_NOSIGNAL) = 38
poll([{fd=4, events=POLLIN}], 1, 5000) = 1 ([{fd=4, revents=POLLIN}])
ioctl(4, FIONREAD, [86]) = 0
recvfrom(4, "\301\4\205\203\0\1\0\0\0\1\0\0\6tjener\6intern\6inter"..., 1024,
0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("127.0.0.1")},
[16]) = 86
close(4) = 0
write(2, "unknown host\n", 13unknown host
) = 13
exit_group(2) = ?
root@tjener:~#
--
Happy hacking
Petter Reinholdtsen
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