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  • Forward all tracif from one IP to another Ip on OS X

    - by Josh
    This is related to this question I just asked... I have two IP address on my iMac I want to "bridge". I'm not sure what the proper terminology is... here's the situation. My iMac has a firewire connection to my laptop and an ethernet connection to the rest of my office. My laptop has an ip of 192.168.100.2 (on the firewire interface). My iMac has an IP of 192.168.100.1 on the firewire interface, and two IPs, 10.1.0.6 and 10.1.0.7, on it's ethernet interface. If I wanted to forward all traffic coming in from 192.168.100.2 on my OS X machine to go out on IP 10.1.0.7, and vice-versa, can this be done? I assume I would use the ipfw command. Essentially I want to "bridge" the firewire network to the ethernet network so my laptop can see all the machines on the 10.1 network, and all those machines can see my laptop at 10.1.0.7. Is this possible?

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  • How to redirect logs from Cisco firewall to a specific file ?

    - by nitins
    We need to redirect the logs from our Cisco firewall(SA520-K9) to syslogd server(it's a CentOS server). The settings are done on the firewall. But the messages from firewall are going to /var/log/messages and console instead of /var/log/firewall.log which is our requirent. *.info;mail.none;authpriv.none;cron.none /var/log/messages authpriv.* /var/log/secure mail.* -/var/log/maillog cron.* /var/log/cron *.emerg * uucp,news.crit /var/log/spooler local7.* /var/log/firewall.log This is our syslog config file. Any advices ?

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  • What effect does RAID stripe size have on read-ahead settings?

    - by stbrody
    I'm trying to figure out the correct read-ahead values to set on a RAID10 array, and I'm wondering if the RAID stripe size should factor into my considerations. I've heard conflicting information about this in the past. I once heard that you should always set your read-ahead value to a multiple of the RAID stripe size, and never below the stripe size, because that is the minimum amount of data the RAID controller will ever try to read at once. Someone else told me, however, that setting read-ahead below the stripe size is fine, and can, in fact, increase the amount of parallel reads you can do across devices in the array, increasing performance and decreasing load on the array. So which is it? Do read-ahead settings that aren't multiples of the stripe size make sense or not?

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  • "postgres blocked for more than 120 seconds" - is my db still consistent?

    - by nn4l
    I am using an iscsi volume on an Open-E storage system for several virtual machines running on a XenServer host. Occasionally, when there is a very high disk I/O load on the virtual machines (and therefore also on the storage system), I got this error message on the vm consoles: [2594520.161701] INFO: task kjournald:117 blocked for more than 120 seconds. [2594520.161787] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162194] INFO: task flush-202:0:229 blocked for more than 120 seconds. [2594520.162274] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2594520.162801] INFO: task postgres:1567 blocked for more than 120 seconds. [2594520.162882] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. I understand this error message is caused by the kernel to inform that these processes haven't been run for 120 seconds, most likely because a disk access to the storage system has not yet been processed. But what is the effect on the processes. For example, will the postgres process eventually write its data when the storage system is idle again after a few minutes, so that all data is still consistent? Or will it abort the write, leaving some tables in an inconsistent state? I certainly expect that the former should be the case - if the disk access is slow, postgres (or any other affected process) should just wait as long as it takes. I can live with the application hanging for a few minutes. But if there is a chance for data corruption then any of these errors is really bad news. Please advise what to do here.

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  • Persuading openldap to work with SSL on Ubuntu with cn=config

    - by Roger
    I simply cannot get this (TLS connection to openldap) to work and would appreciate some assistance. I have a working openldap server on ubuntu 10.04 LTS, it is configured to use cn=config and most of the info I can find for TLS seems to use the older slapd.conf file :-( I've been largely following the instructions here https://help.ubuntu.com/10.04/serverguide/C/openldap-server.html plus stuff I've read here and elsewhere - which of course could be part of the problem as I don't totally understand all of this yet! I have created an ssl.ldif file as follows; dn:cn=config add: olcTLSCipherSuite olcTLSCipherSuite: TLSV1+RSA:!NULL add: olcTLSCRLCheck olcTLSCRLCheck: none add: olcTLSVerifyClient olcTLSVerifyClient: never add: olcTLSCACertificateFile olcTLSCACertificateFile: /etc/ssl/certs/ldap_cacert.pem add: olcTLSCertificateFile olcTLSCertificateFile: /etc/ssl/certs/my.domain.com_slapd_cert.pem add: olcTLSCertificateKeyFile olcTLSCertificateKeyFile: /etc/ssl/private/my.domain.com_slapd_key.pem and I import it using the following command line ldapmodify -x -D cn=admin,dc=mydomain,dc=com -W -f ssl.ldif I have edited /etc/default/slapd so that it has the following services line; SLAPD_SERVICES="ldap:/// ldapi:/// ldaps:///" And everytime I'm making a change, I'm restarting slapd with /etc/init.d/slapd restart The following command line to test out the non TLS connection works fine; ldapsearch -d 9 -D cn=admin,dc=mydomain,dc=com -w mypassword \ -b dc=mydomain,dc=com -H "ldap://mydomain.com" "cn=roger*" But when I switch to ldaps using this command line; ldapsearch -d 9 -D cn=admin,dc=mydomain,dc=com -w mypassword \ -b dc=mydomain,dc=com -H "ldaps://mydomain.com" "cn=roger*" This is what I get; ldap_url_parse_ext(ldaps://mydomain.com) ldap_create ldap_url_parse_ext(ldaps://mydomain.com:636/??base) ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP mydomain.com:636 ldap_new_socket: 3 ldap_prepare_socket: 3 ldap_connect_to_host: Trying 127.0.0.1:636 ldap_pvt_connect: fd: 3 tm: -1 async: 0 TLS: can't connect: A TLS packet with unexpected length was received.. ldap_err2string ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1) Now if I check netstat -al I can see; tcp 0 0 *:www *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:https *:* LISTEN tcp 0 0 *:ldaps *:* LISTEN tcp 0 0 *:ldap *:* LISTEN I'm not sure if this is significant as well ... I suspect it is; openssl s_client -connect mydomain.com:636 -showcerts CONNECTED(00000003) 916:error:140790E5:SSL routines:SSL23_WRITE:ssl handshake failure:s23_lib.c:188: I think I've made all my certificates etc OK and here are the results of some checks; If I do this; certtool -e --infile /etc/ssl/certs/ldap_cacert.pem I get Chain verification output: Verified. certtool -e --infile /etc/ssl/certs/mydomain.com_slapd_cert.pem Gives "certtool: the last certificate is not self signed" but it otherwise seems OK? Where have I gone wrong? Surely getting openldap to run securely on ubuntu should be easy and not require a degree in rocket science! Any ideas?

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  • Network Access via Terminal

    - by HamdiKavak
    I have a weird problem. Here is my configuration. I installed VirtualBox on Windows 7 PC. I installed Ubuntu 10.04 on VirtualBox. I installed many programs via terminal and I can still install. My browser can connect to internet. But I cannot ping any website e.g. google.com. I cannot download anything from git.I can only ping 192.168.1.1 that is all. What would be the reason guys? UPDATE I can ping with another internet connection which I use in office.

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  • How to get top command output to show rake arguments?

    - by wbharding
    In the past, all of our servers have automatically shown command arguments passed to rake when we view them in top. For example: But on this particular server, we get this instead (picture is top running, showing the rake command, but not showing any of the arguments that had been passed to rake): Both servers are running Ubuntu (though the server without rake commands is a newer flavor of ubuntu). Both run rake through ruby enterprise edition (as powered by rvm). Can't seem to find any documentation on how top chooses what to show in the "command" column, other than the obvious "more data/less data" toggle (all screenshots are shown with the extra data enabled. Anyone encountered anything similar to this?

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  • Flexible traffic & bandwidth monitor

    - by BrNathan
    I have looked around, but have not found anything to meet our needs. I need something that can log all connections & bandwidth consumption. We need it for analysis: by protocol, source IP (& MAC if possible), destination, etc. Ideally we are looking for something that can produce custom graphs & also uses mysql. All connections go through one server on a bridged connection (2 network cards) so it is easy to pickup traffic. We are not concerned so much with internal LAN traffic as what passes in & out to the firewall. Thanks for you suggestions. Update: I use Ubuntu 10.04

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  • Apple keyboard key remapping under Ubuntu

    - by jfmessier
    I have an Apple keyboard that I simply love. I now hate my regular keyboard at work. I just have a small problem with the Apple keyboard. There is no "insert" key. The one that is usually Insert on regualr keyboard is replaced by the "fn" key. I would like to keep the fn functionality, as it is useful with the Fx keys on the top of my keyboard. If I have another key that I want to remap, whoe can I get the code, and then assign the code to the "Insert" function ? I mainly use this key for clipboard stuff (Ctrl-Ins, Shift-Ins), and sometime I have no other option than use the mouse, which is something I want to avoid. For example, the "Eject" button could be re-assigned, or use the F13..F19 keys, which are not on regular keyboards anyway. Thanks :-)

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  • Vim Stuck In Insert Mode

    - by Levi Hackwith
    I've been using Vim for several months now via my web host (they allow putty access). All of a sudden, the escape key has become unresponsive. I cannot exist insert or any other mode by simply hitting escape. I have to hit F1 which brings up the help in vim and kicks me into command mode. I'm most certain that my escape key on my keyboard is functioning fine since all of my windows shortcuts that use the escape key operate normally. I know this is a ridiculous question and I'm certain there's a lot more to look into regarding a solution. What I really need is a solid lead as to where to start looking. Things that might help: I'm using vim via putty I'm logging in using jailshell I'm not root

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  • Preventing auto-restart of nautilus on gnome 2.28

    - by Ivan Vucica
    Cheers! I dislike disobedience from my system. When I want to explicitly kill Nautilus with kill or killall, I am no longer able to do so. Previously I could disable this erroneous behavior (which even Windows do not exhibit!) through gnome-session-properties, however, it is no longer possible to set the "restart style" there (or whatever it was called). What is nowadays the correct way to disable nautilus autorestart under gnome? Reasons: I'm writing a piece of software that's painting directly into X11 root window. Nautilus is interfering. Compiz has a wallpapers plugin which Nautilus is painting over.

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  • Improving TCP performance over a gigabit network with lots of connections and high traffic of small packets

    - by MinimeDJ
    I’m trying to improve my TCP throughput over a “gigabit network with lots of connections and high traffic of small packets”. My server OS is Ubuntu 11.10 Server 64bit. There are about 50.000 (and growing) clients connected to my server through TCP Sockets (all on the same port). 95% of of my packets have size of 1-150 bytes (TCP header and payload). The rest 5% vary from 150 up to 4096+ bytes. With the config below my server can handle traffic up to 30 Mbps (full duplex). Can you please advice best practice to tune OS for my needs? My /etc/sysctl.cong looks like this: kernel.pid_max = 1000000 net.ipv4.ip_local_port_range = 2500 65000 fs.file-max = 1000000 # net.core.netdev_max_backlog=3000 net.ipv4.tcp_sack=0 # net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.somaxconn = 2048 # net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216 # net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_mem = 50576 64768 98152 # net.core.wmem_default = 65536 net.core.rmem_default = 65536 net.ipv4.tcp_window_scaling=1 # net.ipv4.tcp_mem= 98304 131072 196608 # net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_rfc1337 = 1 net.ipv4.ip_forward = 0 net.ipv4.tcp_congestion_control=cubic net.ipv4.tcp_tw_recycle = 0 net.ipv4.tcp_tw_reuse = 0 # net.ipv4.tcp_orphan_retries = 1 net.ipv4.tcp_fin_timeout = 25 net.ipv4.tcp_max_orphans = 8192 Here are my limits: $ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 193045 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1000000 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 1000000 [ADDED] My NICs are the following: $ dmesg | grep Broad [ 2.473081] Broadcom NetXtreme II 5771x 10Gigabit Ethernet Driver bnx2x 1.62.12-0 (2011/03/20) [ 2.477808] bnx2x 0000:02:00.0: eth0: Broadcom NetXtreme II BCM57711E XGb (A0) PCI-E x4 5GHz (Gen2) found at mem fb000000, IRQ 28, node addr d8:d3:85:bd:23:08 [ 2.482556] bnx2x 0000:02:00.1: eth1: Broadcom NetXtreme II BCM57711E XGb (A0) PCI-E x4 5GHz (Gen2) found at mem fa000000, IRQ 40, node addr d8:d3:85:bd:23:0c [ADDED 2] ethtool -k eth0 Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: on tcp-segmentation-offload: on udp-fragmentation-offload: off generic-segmentation-offload: on generic-receive-offload: on large-receive-offload: on rx-vlan-offload: on tx-vlan-offload: on ntuple-filters: off receive-hashing: off [ADDED 3] sudo ethtool -S eth0|grep -vw 0 NIC statistics: [1]: rx_bytes: 17521104292 [1]: rx_ucast_packets: 118326392 [1]: tx_bytes: 35351475694 [1]: tx_ucast_packets: 191723897 [2]: rx_bytes: 16569945203 [2]: rx_ucast_packets: 114055437 [2]: tx_bytes: 36748975961 [2]: tx_ucast_packets: 194800859 [3]: rx_bytes: 16222309010 [3]: rx_ucast_packets: 109397802 [3]: tx_bytes: 36034786682 [3]: tx_ucast_packets: 198238209 [4]: rx_bytes: 14884911384 [4]: rx_ucast_packets: 104081414 [4]: rx_discards: 5828 [4]: rx_csum_offload_errors: 1 [4]: tx_bytes: 35663361789 [4]: tx_ucast_packets: 194024824 [5]: rx_bytes: 16465075461 [5]: rx_ucast_packets: 110637200 [5]: tx_bytes: 43720432434 [5]: tx_ucast_packets: 202041894 [6]: rx_bytes: 16788706505 [6]: rx_ucast_packets: 113123182 [6]: tx_bytes: 38443961940 [6]: tx_ucast_packets: 202415075 [7]: rx_bytes: 16287423304 [7]: rx_ucast_packets: 110369475 [7]: rx_csum_offload_errors: 1 [7]: tx_bytes: 35104168638 [7]: tx_ucast_packets: 184905201 [8]: rx_bytes: 12689721791 [8]: rx_ucast_packets: 87616037 [8]: rx_discards: 2638 [8]: tx_bytes: 36133395431 [8]: tx_ucast_packets: 196547264 [9]: rx_bytes: 15007548011 [9]: rx_ucast_packets: 98183525 [9]: rx_csum_offload_errors: 1 [9]: tx_bytes: 34871314517 [9]: tx_ucast_packets: 188532637 [9]: tx_mcast_packets: 12 [10]: rx_bytes: 12112044826 [10]: rx_ucast_packets: 84335465 [10]: rx_discards: 2494 [10]: tx_bytes: 36562151913 [10]: tx_ucast_packets: 195658548 [11]: rx_bytes: 12873153712 [11]: rx_ucast_packets: 89305791 [11]: rx_discards: 2990 [11]: tx_bytes: 36348541675 [11]: tx_ucast_packets: 194155226 [12]: rx_bytes: 12768100958 [12]: rx_ucast_packets: 89350917 [12]: rx_discards: 2667 [12]: tx_bytes: 35730240389 [12]: tx_ucast_packets: 192254480 [13]: rx_bytes: 14533227468 [13]: rx_ucast_packets: 98139795 [13]: tx_bytes: 35954232494 [13]: tx_ucast_packets: 194573612 [13]: tx_bcast_packets: 2 [14]: rx_bytes: 13258647069 [14]: rx_ucast_packets: 92856762 [14]: rx_discards: 3509 [14]: rx_csum_offload_errors: 1 [14]: tx_bytes: 35663586641 [14]: tx_ucast_packets: 189661305 rx_bytes: 226125043936 rx_ucast_packets: 1536428109 rx_bcast_packets: 351 rx_discards: 20126 rx_filtered_packets: 8694 rx_csum_offload_errors: 11 tx_bytes: 548442367057 tx_ucast_packets: 2915571846 tx_mcast_packets: 12 tx_bcast_packets: 2 tx_64_byte_packets: 35417154 tx_65_to_127_byte_packets: 2006984660 tx_128_to_255_byte_packets: 373733514 tx_256_to_511_byte_packets: 378121090 tx_512_to_1023_byte_packets: 77643490 tx_1024_to_1522_byte_packets: 43669214 tx_pause_frames: 228 Some info about SACK: When to turn TCP SACK off?

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  • What else is needed to get iptables to log into this file I created?

    - by anthony01
    I want to create the logging of iptables DROP's and intrusion attemps. First, I put --log-prefix "iptables: " at the end of every iptables rules in my iptables rules file. But this doesn't work, as it says there is a syntax error. So where should I put that command? (I would want to have it included in the saved rules file) Secondly, I created a file iptables.conf within /etc/rsyslog.d/, and I put the following inside of it: :msg, startswith, "iptables: " -/var/log/iptables.log & ~ I assume that at this stage, I'm supposed to restart the rsyslog daemon. What else is needed to do what I'm attempting? Thanks a lot

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  • Kannel step-by-step installation tutorial

    - by user1410971
    I've been trying to install Kannel opensource gateway for sending free sms on my computer. But I never managed to make it work by reading the guide from the official website. So I'm starting over and interested in all information I can get. What hardware do I need? Can I install it on Ubuntu 12.04? Could someone post a link of a good tutorial, or write one here on step-by-step Kannel installation. Edit: Also, an example of sms sending using a php script would be appreciated. Thanks in advance :)

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  • Copying symbolic links and filenames with special characters to NAS

    - by Mr E
    I have a new Western Digital My Book Live NAS. I am trying to copy files from an old drive to the NAS. I'm using Ubuntu 12.04 and I've mounted the drive by browsing the network in Nautilus and choosing a shared folder configured on the NAS. The shared folder is then automatically mounted at .gvfs/files on mybooklive. There are two problems so far: File names and directory names containing certain characters (e.g. : or |). Attempting to copy these results in the error message: cp: cannot stat `/path/to/destination.filename': Invalid argument Symbolic links. In Nautilus I get the error message: Symlinks not supported by backend My questions are: Can I connect to the NAS or configure the NAS so that I can copy my files without this problem? (In case it matters, I don't need Windows compatibility.) If not, what can I do to identify all the problem files? Can I do anything to automatically fix my filenames Please let me know if any of this needs clarification. I'm not too familiar with all of this so I may have left out some useful information.

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  • numbering some content of a file using grep or any other commands

    - by ir01
    I have a file like this: ==================================[RUN]=================================== result : Ok CPU time : 0.016001 s ==================================[RUN]=================================== result : Ok CPU time : 1.012010 s i want to numbering RUNs like this ==================================[RUN 1]=================================== result : Ok CPU time : 0.016001 s ==================================[RUN 2]=================================== result : Ok CPU time : 1.012010 s how can i do that using grep or any other commands?

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  • Forward the Wan IP to another Wan IP without change the Source address

    - by user195410
    I have tried this case by using the NAT function in iptables but fail example. PC A IP is 1.1.1.1 (Win7) My Server IP is 2.2.2.2 (CentOS 6.2) target Server B is 3.3.3.3 (Windows server 2003) Flow: PC A WanIP -- My Server A -- Server B (WanIP) ----My iptables rules--------- iptables -t nat -A PREROUTING -d 2.2.2.2 -p tcp --dport 80 -j DNAT --to-destination 3.3.3.3:80 iptables -t nat -A POSTROUTING -d 2.2.2.2 -j MASQUERADE finally, i can access server B website by enter 2.2.2.2:80 but when i checked the access log at Server B i found it's source address had been changed to src:2.2.2.2 dst:3.3.3.3 please help me to do how to get the real address is src:1.1.1.1 dst:3.3.3.3

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  • 'Memory read error',Sever hardware error?

    - by wss8848
    hello I got a error about my server which is running CentOS5.5. MCE 20 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 1 BANK 8 TSC 6ab9ff9745f62 [at 2394 Mhz 9 days 1:50:52 uptime (unreliable)] MISC cf36ad0100081186 ADDR 203376500 MCG status: MCi status: MCi_MISC register valid MCi_ADDR register valid MCA: MEMORY CONTROLLER RD_CHANNELunspecified_ERR Transaction: Memory read error STATUS 8c0000400001009f MCGSTATUS 0 what is the matter? is memory card error or memory controller error?

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  • brctl Not working fine with bridging eth0 and at0

    - by Passi0n
    I made an access point with airbase-ng and its at0 I tried to bridge my eth0 and at0 by brctl addbr demo brctl addif demo eth0 brctl addif demo at0 brctl demo up dhclient3 demo & already removed eth0 ip so when i use ping 192.168.1.1 -I eth0 theres no reply but if i use ping 192.168.1.1 -I demo it works!!! In browser internet works fine so when i connect my android with at0 (access point) it should same work. but its now working at all :(

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  • debian modem problems !!!

    - by Raafat
    hay there guys ... I'm a new Debian user, it looks like a very good choice 4 me, every thing is stable, free and easy to use. the problem is, I'm using my modem to establish a dial up connection to the internet (ppp) (a very old stupid way I'm forced to use for now), and using the KPPP application to do that, and nothing is working properly for me. it seems like it didn't recognize my modem or something. i already tried to make a few stuff, and now i know my modem is on /dev/tty0, so i made a link for that on /dev/modem, and query the modem using KPPP and it responded with something like: Ati : Ati0: Ati1: ... ... Ati7: with a textBox to fill up in front of each one of thees Atis, and now, when i press connect on kppp, it says modem ready, and that's it. BTW, my modem is MDC AC'97 any suggestions pleas ....

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  • Is it possible for root to execute a command as non-root

    - by adnan kamili
    I am root user and suppose i want to run any application as another user. is it possible, without switching to another user. Something like # google-chrome user=abc I am actually executing a cli program as a non root user. I have set the sticky bit on and i am using setuid. So the program runs with root privileges. Now i am using system() with in the program to invoke gui app. But i dont want to run it as root. so i want to temporarily drop root privileges only for that call.

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  • Where are ethernet errors logged?

    - by Matt
    Munin is showing me a graph like this: During that spike, I was unable to access my server through the eth0 port (I could access it through my IPMI port). I'm trying to figure out what happened, but I can't seem to locate any log files for eth0. I don't see anything in /var/log/(kern|syslog|messages) that is out of the ordinary. And I don't see a log file specifically for eth0. Are there logs for eth0, and if so, where can I find them? I am running Ubuntu 10.04 LTS.

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