I missed that option! thanks! <div class="gmail_quote">2010/8/17 James Hogarth <<a href="mailto:james.hogarth@gmail.com">james.hogarth@gmail.com</a>> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> <div><div></div><div class="h5">On 17 August 2010 09:22, Marcos <<a href="mailto:fraga.muerete@gmail.com">fraga.muerete@gmail.com</a>> wrote: > Hi everyone, > > I noticed a timeout while pinging, and as ping wasn't losing packets, I did > and strace and got the following (among many output) > > > # strace ping server > > [...] > write(5, "RESOLVE-ADDRESS 10.1.1.25\n", 26) = 26 > read(5, "-15 Timeout reached\n", 4096) = 20 > close(5) = 0 > munmap(0x7fc72972b000, 4096) = 0 > write(1, "64 bytes from <a href="http://10.1.1.25" target="_blank">10.1.1.25</a>: icmp_se"..., 5864 bytes from <a href="http://10.1.1.25" target="_blank">10.1.1.25</a>: > icmp_seq=2 ttl=125 time=0.319 ms > ) = 58 > sendmsg(3, {msg_name(16)={sa_family=AF_INET, sin_port=htons(0), > sin_addr=inet_addr("10.1.1.25")}, > msg_iov(1)=[{"\10\0,\237\304F\0\3!<jL\0\0\0\0\266\273\6\0\0\0\0\0\20\21\22\23\24\25\26\27"..., > 64}], msg_controllen=0, msg_flags=0}, MSG_CONFIRM) = 64 > recvmsg(3, {msg_name(16)={sa_family=AF_INET, sin_port=htons(0), > sin_addr=inet_addr("10.1.1.25")}, > msg_iov(1)=[{"E\0\0Tq(@\0}\1\2115\n\1\1\31\254\20L!\0\0004\237\304F\0\3!<jL"..., > 192}], msg_controllen=32, {cmsg_len=32, cmsg_level=SOL_SOCKET, > cmsg_type=0x1d /* SCM_??? */, ...}, msg_flags=0}, 0) = 84 > open("/etc/hosts", O_RDONLY|O_CLOEXEC) = 5 > fstat(5, {st_mode=S_IFREG|0644, st_size=243, ...}) = 0 > mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0x7fc72972b000 > read(5, "127.0.0.1 localhost\n127.0.1.1 IN"..., 4096) = 243 > read(5, "", 4096) = 0 > close(5) = 0 > munmap(0x7fc72972b000, 4096) = 0 > stat("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=126, ...}) = 0 > socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 5 > connect(5, {sa_family=AF_INET, sin_port=htons(53), > sin_addr=inet_addr("10.1.1.25")}, 16) = 0 > poll([{fd=5, events=POLLOUT}], 1, 0) = 1 ([{fd=5, revents=POLLOUT}]) > sendto(5, "\3718\1\0\0\1\0\0\0\0\0\0\00225\0011\0011\00210\7in-addr\4a"..., > 40, MSG_NOSIGNAL, NULL, 0) = 40 > poll([{fd=5, events=POLLIN}], 1, 5000) = 1 ([{fd=5, revents=POLLIN}]) > ioctl(5, FIONREAD, [131]) = 0 > recvfrom(5, > "\3718\205\203\0\1\0\0\0\1\0\0\00225\0011\0011\00210\7in-addr\4a"..., 1024, > 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("10.1.1.25")}, > [16]) = 131 > close(5) = 0 > socket(PF_FILE, SOCK_STREAM, 0) = 5 > fcntl(5, F_GETFD) = 0 > fcntl(5, F_SETFD, FD_CLOEXEC) = 0 > connect(5, {sa_family=AF_FILE, path="/var/run/avahi-daemon/socket"}, 110) = > 0 > fcntl(5, F_GETFL) = 0x2 (flags O_RDWR) > fstat(5, {st_mode=S_IFSOCK|0777, st_size=0, ...}) = 0 > mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0x7fc72972b000 > lseek(5, 0, SEEK_CUR) = -1 ESPIPE (Illegal seek) > write(5, "RESOLVE-ADDRESS 10.1.1.25\n", 26) = 26 > read(5, > > > So, why does ping try to resolve the inverse DNS? Is it the normal > behaviour? I find it quite annoying as I have to wait one DNS timeout with > every packet sent. > Any clues? > > Thanks in advance. > > </div></div>> -- > ubuntu-users mailing list > <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> > Modify settings or unsubscribe at: > <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a> > > It is normal yes as on the output it tries to show a friendly hostname... If you do not want reverse DNS being done use the argument -n `man ping` will give you more details. James -- ubuntu-users mailing list <a href="mailto:ubuntu-users@lists.ubuntu.com">ubuntu-users@lists.ubuntu.com</a> Modify settings or unsubscribe at: <a href="https://lists.ubuntu.com/mailman/listinfo/ubuntu-users" target="_blank">https://lists.ubuntu.com/mailman/listinfo/ubuntu-users</a> </blockquote></div>