Discuss December 2009

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295 participants
272 discussions

Name Resolution Broken for One Address
by John Thomas 07 Dec '09

07 Dec '09

I seem to have broken my laptop and have been unable to figure it out. Name resolution works great, except one address, which seems to be resolving to 0.0.0.1. Could you help me figure out what I have done and fix it? The following lines are in /etc/hosts 192.168.11.1 dev.example.com 192.168.11.1 dev1.example.com Pinging any other address that I try works, except dev.example.com. CentOS54[root@ctlaptop etc]# ping dev1.example.com PING dev1.example.com (192.168.11.1) 56(84) bytes of data. 64 bytes from dev.example.com (192.168.11.1): icmp_seq=1 ttl=64 time=0.093 ms <snip> CentOS54[root@ctlaptop ~]# ping dev.example.com connect: Invalid argument CentOS54[root@ctlaptop ~]# strace ping dev.example.com execve("/bin/ping", ["ping", "dev.example.com"], [/* 33 vars */]) = 0 brk(0) = 0x88f1000 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=82386, ...}) = 0 mmap2(NULL, 82386, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f8b000 close(3) = 0 open("/lib/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\0\300p\277\0004\0\0\0"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=76400, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f8a000 mmap2(NULL, 75976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xd62000 mmap2(0xd71000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe) = 0xd71000 mmap2(0xd73000, 6344, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xd73000 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\340\277.\0004\0\0\0"..., 512) = 512 fstat64(3, {st_mode=S_IFREG|0755, st_size=1611564, ...}) = 0 mmap2(NULL, 1328580, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x994000 mmap2(0xad3000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13f) = 0xad3000 mmap2(0xad6000, 9668, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xad6000 close(3) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f89000 set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f896c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 mprotect(0xad3000, 8192, PROT_READ) = 0 mprotect(0xd71000, 4096, PROT_READ) = 0 mprotect(0x15e000, 4096, PROT_READ) = 0 munmap(0xb7f8b000, 82386) = 0 socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3 getuid32() = 0 setuid32(0) = 0 brk(0) = 0x88f1000 brk(0x8912000) = 0x8912000 getpid() = 5376 open("/etc/resolv.conf", O_RDONLY) = 4 fstat64(4, {st_mode=S_IFREG|0644, st_size=109, ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 read(4, "# Generated by NetworkManager\ndo"..., 4096) = 109 read(4, "", 4096) = 0 close(4) = 0 munmap(0xb7f9f000, 4096) = 0 socket(PF_FILE, SOCK_STREAM, 0) = 4 fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK) = 0 connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"...}, 110) = 0 send(4, "\2\0\0\0\r\0\0\0\6\0\0\0hosts\0", 18, MSG_NOSIGNAL) = 18 poll([{fd=4, events=POLLIN|POLLERR|POLLHUP}], 1, 5000) = 1 ([{fd=4, revents=POLLIN}]) recvmsg(4, {msg_name(0)=NULL, msg_iov(2)=[{"hosts\0", 6}, {"\270O\3\0\0\0\0\0", 8}], msg_controllen=16, {cmsg_len=16, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {5}}, msg_flags=0}, 0) = 14 mmap2(NULL, 217016, PROT_READ, MAP_SHARED, 5, 0) = 0xb7f54000 close(5) = 0 close(4) = 0 socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4 connect(4, {sa_family=AF_INET, sin_port=htons(1025), sin_addr=inet_addr("0.0.0.1")}, 16) = -1 EINVAL (Invalid argument) dup(2) = 5 fcntl64(5, F_GETFL) = 0x2 (flags O_RDWR) fstat64(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f9f000 _llseek(5, 0, 0xbfd43234, SEEK_CUR) = -1 ESPIPE (Illegal seek) write(5, "connect: Invalid argument\n", 26connect: Invalid argument ) = 26 close(5) = 0 munmap(0xb7f9f000, 4096) = 0 exit_group(2) = ? -- Sincerely, John Thomas

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Invitation to connect on LinkedIn
by Gustavo Pastorino 07 Dec '09

07 Dec '09

LinkedIn ------------ Gustavo Pastorino requested to add you as a connection on LinkedIn: ------------------------------------------ Romeo, I'd like to add you to my professional network on LinkedIn. - Gustavo Accept invitation from Gustavo Pastorino http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/pm… View invitation from Gustavo Pastorino http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/39… ------------------------------------------ Why might connecting with Gustavo Pastorino be a good idea? People Gustavo Pastorino knows can discover your profile: Connecting to Gustavo Pastorino will attract the attention of LinkedIn users. See who's been viewing your profile: http://www.linkedin.com/e/wvp/inv18_wvmp/ ------ (c) 2009, LinkedIn Corporation

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Re: [CentOS] NFS new security requirements?
by Mike Yates 07 Dec '09

07 Dec '09

This now mysteriously resolved after both servers have rebooted. The long delay is due to the importance of high availability over the nfs links. Mike Yates Hawkgrove Ltd - Software Systems Design 2, The Business Courtyard, Marl Pits Lane, Trudoxhill, Frome, Somerset, BA11 5DL, UK +44 (0)1373 837900 fax: +44 (0)8700 518155 Registered in England: 2756481 VAT Reg: UK 601 1137 11 Registered Office: NSO Associates LLP, 75 Springfield Road, Chelmsford, Essex CM2 6JB All e-mail is subject to contract and is not intended to create a legally binding agreement. Hawkgrove Ltd will only be bound by an agreement in writing signed by an authorized signatory. All outgoing email is scanned by Kerio, using ClamAV 0.95.1/10117/Mon Dec 7 02:21:53 2009 Known viruses: 662464.

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centos vs rhel vs scientific linux
by Robert P. J. Day 07 Dec '09

07 Dec '09

i'm prepping to teach a 5-day intro class in linux starting in about 3 hours, and the courseware is clearly designed around RHEL (apparently 5.1). but since i'm not being provided with RHEL DVDs, i'm just going to hand everyone a centos 5.4 DVD and take it from there. as part of the intro, i want to briefly discuss the varieties of linux related to RHEL, so obviously i want to mention what centos is all about. in a nutshell, it's simply RHEL with any RH-proprietary branding removed, yes? what's the simplest way to sum up the difference in a sentence or two? and i've never used SL but, again as i understand it, it's also RHEL unbranded but, IIRC, SL is more open to producing updates, whereas centos is rigourous about tracking the corresponding RHEL version. does that sound about right? rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Linux Consulting, Training and Kernel Pedantry. Web page: http://crashcourse.ca Twitter: http://twitter.com/rpjday ========================================================================

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using an alternate audio driver in C5.4
by Mr. X 07 Dec '09

07 Dec '09

Hello, C5.4 on Abit kn9 ultra with MCP55 chipset, model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4600+ #lspci 00:06.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2) sudo lsmod | grep hda snd_hda_intel 584593 1 snd_pcm 116681 2 snd_hda_intel,snd_pcm_oss snd_page_alloc 44113 2 snd_hda_intel,snd_pcm snd_hwdep 43593 1 snd_hda_intel snd 100073 11 snd_hda_intel,snd_seq_oss,snd_seq,snd_seq_device,snd_pcm_oss,snd_mixer Is there a way to use the ac97 drivers instead of the hda_intel? I want to explore this cause Qemu has an ac97 driver. If I can make my audio compatible with the Qemu sound, then I can use guest and local audio at the same time! -- Mark

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OT: How can I tell if a web site is now blocking IPs from my country?
by Lanny Marcus 07 Dec '09

07 Dec '09

I have always been able to browse, without any problems, http://www.mobile-review.com/index-en.shtml but for the past 2 or 3 days, Mozilla Firefox just hangs "connecting to ...." How can I tell if they have started blocking IP addresses from Colombia? I would like to do that, before I post to the IPCop mailing list. I have my IPCop box set up to do DNS Caching, so possibly something went awry there. I use OpenDNS.com and I refreshed their Cache for this web site. I am not having problems browsing other web sites. The site is up and my desktop is dual boot and the same thing happens if I boot to M$ Windows. TIA! An error occurred while loading http://www.mobile-review.com/index-en.shtml: Timeout on server Connection was to www.mobile-review.com at port 80 An error occurred while loading http://www.mobile-review.com/: Timeout on server Connection was to www.mobile-review.com at port 80 above is with Konqueror web browser http://downforeveryoneorjustme.com/http://www.mobile-review.com/index-en.sh… It's just you. http://www.mobile-review.com is up. above from http://downforeveryoneorjustme.com/ Lanny -------------------------------------- Magazine subscriptions Largest discount Credit/Debit Card Check Pay Pal http://lowcostmagazines.com/

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netflow colelction and analysis
by Joseph L. Casale 07 Dec '09

07 Dec '09

Anyone got a reco on a package that can collect netflow data and accept user defined queries for specific data, like what an ip did every hour for some said interval? Thanks! jlc

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Building xfsprogs can't find valid UUID library
by C Linus Hicks 05 Dec '09

05 Dec '09

On CentOS 5.3 x86_64, I'm trying to build xfsprogs-2.9.4-1.el5.centos.x86_64 with -ggdb so I can use it with gdb and examine the data structures when using xfs_db. I've installed the src rpm as a non-root user and when I run rpmbuild -bc during the ./configure I get the error: . . . checking uuid.h usability... no checking uuid.h presence... no checking for uuid.h... no checking sys/uuid.h usability... no checking sys/uuid.h presence... no checking for sys/uuid.h... no checking uuid/uuid.h usability... yes checking uuid/uuid.h presence... yes checking for uuid/uuid.h... yes checking for uuid_compare... no checking for uuid_compare in -luuid... no FATAL ERROR: could not find a valid UUID library. Install the Universally Unique Identifiers library package. error: Bad exit status from /var/tmp/rpm-tmp.42904 (%build) However, I found that /lib64/libuuid.so.1.2 (provided by e2fsprogs-libs-1.39-20.el5.x86_64) does exist and using nm -D shows an entry point for uuid_compare: 000000385a6015e0 T uuid_compare Then I did: strings ld.so.cache | grep uuid libuuid.so.1 /lib64/libuuid.so.1 libuuid.so.1 /lib/libuuid.so.1 libuuid.so /usr/lib/libuuid.so And /lib64/libuuid.so.1 is a symbolic link to /lib64/libuuid.so.1.2. The only hit on Google that looked interesting was from 2006: http://oss.sgi.com/archives/xfs/2006-03/msg00425.html Can anybody tell me what's going wrong and how to fix it? Thanks for your help. Linus

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CentOS/RHEL's build of firefox hardwired to evolution -- how to change this
by Robert Heller 05 Dec '09

05 Dec '09

For some awful reason (can someone explain why?), the RHEL/CentOS build of firefox is hardwired to use evolution as its mailto client. With FF 2.<mumble> this was fixable with an about:config setting. With 3.0.<mumble>, it seems not. What is the proper way of fixing this? *I* ended up doing a 'sudo rpm -e evolution' and then doing a 'sudo ln -s <myfirefoxmailtohandler> /usr/bin/evolution'. This is a truely ugly/bad solution, but it is the only one I know of. Please tell be of a better solution. (Hopefully not one that requires me to download the firefox SRPM and hacking the .spec file -- re-building building firefox from sources is non-trivial -- I'd *rather* drop random symlinks into /usr/bin, bad as that is.) *I'm* tempted to report this as a serious *bug* (I really consider it so). -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller(a)deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/

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two questions about ssh tunneling
by Tudod Ki 05 Dec '09

05 Dec '09

if I: ssh -fND localhost:6000 somebody(a)192.168.56.5 -p PORTNUMBER from computer "A" to computer "B" [B = 192.168.56.5] then I can set the SOCKS proxy for e.g.: Firefox to use "localhost:6000" on computer "A". Ok. I can surf the web through "B". But: - Can anyone sniff the traffic of "A"? [e.g.: computers on same subnet as "A"] Like DNS requests? - I think no, but I'm not sure :O - Can anyone sniff the traffic of computer "B"? e.g.: B computer is at a server farm [others in the farm can see the traffic?] - I think yes, but I'm not sure :O

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Discuss December 2009