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• how to grep ip from ifconfig output

  - by Registered User

  Following is my ifconfig output eth0 Link encap:Ethernet UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:28 Base address:0x2000 eth1 Link encap:Ethernet inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:36497 errors:0 dropped:0 overruns:0 frame:14515 TX packets:44884 errors:1352 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:20781745 (20.7 MB) TX bytes:17776225 (17.7 MB) Interrupt:17 Base address:0xc000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:12 errors:0 dropped:0 overruns:0 frame:0 TX packets:12 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:720 (720.0 B) TX bytes:720 (720.0 B) virbr0 Link encap:Ethernet inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:4416 (4.4 KB) vmnet1 Link encap:Ethernet inet addr:192.168.185.1 Bcast:192.168.185.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vmnet8 Link encap:Ethernet inet addr:192.168.207.1 Bcast:192.168.207.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:25 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) I want to do some thing grep that I see the IP corresponding to each LAN card? Is that possible? How can it be achieved?

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• Amazon EC2 Reserved Instances: "Heavy Utilization" clarification

  - by gravyface

  Should be another easy one here, but I need clarification on what they define as "heavy utilization" for Reserved Instance types. From their Website: Heavy Utilization RIs – Heavy Utilization RIs offer the most absolute savings of any Reserved Instance type. They’re most appropriate for steady-state workloads where you’re willing to commit to always running these instances in exchange for our lowest hourly usage fee. With this RI, you pay a little higher upfront payment than Medium Utilization RIs, a significantly lower hourly usage fee, and you’re charged that lower hourly rate for every hour in the Reserved Instance term you purchase. Using Heavy Utilization RIs, you can save up to 41% for a 1-year term and 58% for a 3-year term vs. running On-Demand Instances. If you’re trying to find a break-even utilization, you’re economically advantaged using Heavy Utilization RIs (vs. On-Demand Instances) if you plan to use your instance more than 43% of a 1-year term or 79% of a 3-year term. I'm assuming that, if I'm planning on running a 24/7 Web Server, then regardless of how many resources I consume (bandwidth, cpu cycles, memory), I would want to go with a Heavy Utilization Reserved Instance? This one Web Server in particular will likely barely budge the cpu, but it needs to be up and running 24/7. Not 100% on what they're defining as "heavy".

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• is it worth to use load balancer on web server/website

  - by user427969

  I have a website and a while ago, the web server of the company hosting my website was down for about a day. I consulted the company for a solution on how i can stop this from happening in future and they suggested to have a second machine and which will be connected to my current website/web server by a "load balancer" (at an additional huge cost!!!). The second machine will be replicate of the first one and so if i goes down, the other will always be running. ---- Explanation ----- My hosting company suggested that it will be a good idea to have a second machine running at the same time and both the machines will be connected by a load balancer which reduces the rist of a downtime. The second machine will be a mirror of the first and any changes to first must be replicated in the second. I don't mind spending money if it really saves my website from going down. I want to know is it worth having this "load balancer" for my purpose? My website is a 24/7 service. I cannot afford an outage of 24 hours/1 hour. I don't mind using this "load balancer" as far as it is really worth. I am not sure if its just a marketing trick of my hosting company or really a "best" solution Thanks for help. Regards

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• kickstart ks.cfg: Where should 'url' point?

  - by Stefan Lasiewski

  I have a kickstart file (ks.cfg) on a floppy (Old style). I am trying to install CentOS 5.4. The top of my ks.cfg says this: install # Install from local cdrom or over the network. #cdrom url --url http://kickstart.example.org/pub/centos/5.4/ On the Apache server side, this command is failing with these 404s: kickstart.example.org 192.168.16.180 - - [01/Jun/2010:17:24:30 -0700] "GET /pub/centos/5.4///disc1/.discinfo HTTP/1.1" 404 314 "-" "urlgrabber/3.1.0" kickstart.example.org 192.168.16.180 - - [01/Jun/2010:17:24:43 -0700] "GET /pub/centos/5.4/repodata/repomd.xml HTTP/1.1" 404 316 "-" "urlgrabber/3.1.0 yum/3.2.22" It seems that the value of my url doesn't match the directory structure on the server. I swear this worked a few months ago. Someone else maintains the Yum repository, and they say nothing has changed. What should the value of url URL be? Should this only include the OS (/pub/centos/5.4/), or should it include the architecture (/pub/centos/5.4/os/x86_64 )? I see that Kickstart is trying to grab a file called 'repomd.xml', but why is it looking in '/pub/centos/5.4/repodata/repomd.xml', when these files actually exist at '/pub/centos/5.4/os/x86_64/repodata/repomd.xml' and other locations at '/pub/centos/5.4/*/$ARCH/repodata/repomd.xml'? I don't see this documented or explained well in the [RedHat 5 Installation Guide1]

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• How to let hard drive sleep in RAID1 configuration?

  - by Al Kepp

  Normally in Windows 7 a hard drive stops spinning when it is not used for a longer while. This can be configured in Windows and I use it on computers which are turned on 24/7 but not used much often. My problem is on a computer with Intel X79 chipset with an integrated RAID controller. There is Windows 7 installed on an SSD drive, and there is RAID1 array with two SATA HDD drives for data. Those SATA drives aren't used much so I'd like to let them sleep (i.e stop spinning). But they ignore settings in Windows. How to let them sleep when using RAID1? It seems to me that those drives are "unstoppable", they are spinning 24/7 even when they aren't used at all. Maybe they would behave normally if I used Windows-based software RAID, but I use hardware RAID controller. Is there a way to let them stop spinning and sleep after for example 3 or 5 hours of inactivity (i.e. the same way as they would behave in Windows without RAID)?

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• Cisco Catalyst 3750 connected to Cisco ASA 5505 and dropping packets

  - by Bo102010

  (Cross posted from Super User per suggestion there) At the office, I have inherited a network that I am still trying to fully comprehend. I have a problem today with a new connection between: A port on a Cisco Catalyst 3750 [WS-C3750G-48TS-S running C3750-IPSERVICESK9-M version 12.2(53)SE1] A port on a Cisco ASA 5505 [ASA Software version 8.3(2)] The 3750 is home to a Vlan that has a few ports assigned to it. interface Vlan3 description Internal network (172.18.160.0/24) ip address 172.18.160.1 255.255.255.0 I have a host (outside of my control) that needs to be in this VLAN (i.e it must have an address 172.18.160.something/24) that also needs to access the Internet. To accomplish this, I ran a link from the Catalyst (Gi1/0/13) to the ASA (Ethernet 0/5). I configured the Catalyst port like so: interface GigabitEthernet1/0/13 description To ASA, 172.18.160.69 switchport access vlan 3 switchport mode access speed 100 duplex full I configured the ASA like so: interface Vlan1 nameif inside security-level 100 ip address 172.18.160.69 255.255.255.0 interface Ethernet0/5 speed 100 duplex full Then I plugged the host into Ethernet 0/4 on the ASA and instructed its owner to make its default gateway 172.18.160.69. I made a NAT rule in the ASA and set up some rules, and it's able to access the Internet without issue. However, I noticed that the Catalyst reports a ton of packets being dropped toward the ASA. Catalyst3750#show interfaces GigabitEthernet 1/0/13 | include counters|drops Last clearing of "show interface" counters 00:28:13 Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 136909347 This is a huge number of drops, since there's not much traffic on this VLAN at all. I tried these things: Make sure speed and duplex agree on both sides (100 Mbps / Full) Set no cdp enable on the Catalyst Gi10/13 Set no keepalive on the Catalyst Gi10/13 Checked for excessive CPU usage on both Checked for excessive traffic on both Am I missing something? Any help would be appreciated.

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• Huge host CPU usage in idle vmware guest. Ubuntu 10.04 host, Vista SP2 guest

  - by themesandmodules

  I'm experiencing huge host CPU usage with an idle vmware guest. Host: Ubuntu 10.04 32-bit 2.6.32-24-generic-pae. (Very new install, i.e 24 hours ago) Hardware is Dell XPS M1530 laptop, 4GB ram. Intel Core II Duo T9300 2.50Ghz The virtualization setting "VT" or something is enabled in my bios. Guest: Completely fresh install of Windows Vista, upgraded to latest SP2 and all windows updates installed. 1024 - 1512MB ram allocated. Absolutely no other software installed on it, apart from VMWare tools. Situation When the guest is doing absolutely nothing, I watch with sysinternals process watch on the guest. This shows that system idle process is between 70 and 99%, usually around 95%. No actual process doing anything. On the host, I watch with top, I get cpu usage of 20% - 80%, usually around 30%. What I have tried Single and Dual processor available to guest - no change. Turn off all peripherals to guest - no network, drives, usb etc - no change. Turn off 3d acceleration for guest - perhaps a small improvement, or no change. Upping allocated ram to guest from 1024MB to 1512MB - no change. Yelling at vmware - no change. I have experienced a similar issue in the past, which was solved by setting the guest to have 1 CPU. This time that hasn't worked.

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• ESX Scheduler and NUMA issue

  - by babyg_wc

  On our 24 core bl685 (4sockets x 6core), we find that NUMA nodes 0 and 1 are pretty busy (unfortunately resulting in elevated cpu ready times on the VMS), whilst NUMA nodes 2 and 3 are almost unused. I thought this just maybe a ESX4 U1 issue, so I had a colleague with a 32 core (dl785) farm investigate, and it seems that his last 3 or 4 NUMA nodes are also not really being utilised. ESX seems to have a weakness when it comes to balancing lightly loaded NUMA boxes, Im going to enabled node interleaving in the BIOS and see if the scheduler balancers across all 24 cores, instead of just 12!... For those of you with large core counts, I would suggest you fire up you viclient, and check Physical CPU useage (or esxtop), I would be interested to hear what your results are. Please note, that its only the lightly loaded (eg less than 30% cpu load on the esx host) that seems to have the biggest issue with load imbalance. Thoughts/comments. PS ive logged a SR with vmware to assist, also the other "problem" could be that we have 128gb of ram in each host, and therefore the scheduler sees no good reason why it shouldnt try and cram all vms's into the first two NUMA nodes, as we only have around 50gb of ram worth of vms on each host...

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• Cisco Pix 515 ip addressing

  - by Rickard

  I have just gotten my hands on a Cisco Pix 515 (not 515E) with 3 interfaces, and are just about to start some labs. In my lab, I am using a real life scenario from an actual setup at work. As I have no access to the device at work, I am simply trying to replicate the scenario by trial and error. At work, we are given two IP addresses from the provider, which is 1-to-1 nated addresses. The addresses we are allowed to use are: 10.131.35.4-5/29 Now, we have 3 servers on a DMZ, 192.168.2.2-4/24 and 17 client computers on 192.168.1.100-117/24 aswell as some static addressed devices on 192.168.1.8-18/27 My question is, how would I best set up so that the machines on the DMZ get's translated to 10.131.35.4 and the machines on 192.168.1.* will be translated to 10.131.35.5 I don't expect or want anyone to give me a fully functional config, I may learn from it, but I'd prefer to just have some advices or maybe a guide on how to set it up. I hope someone can shed some light over my situation, have been looking through google but I guess I don't the searchwords I'm using isn't too good as I can't find any good clues. THank you very much! PS. Maybe I should add, I am not unfamiliar with the Cisco CLI, as I prefer using that before any gui's. So not really looking for any solutions for the ASDM. DS.

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• linux + create host file from CSV file by sed or awk or perl

  - by yael

  I have the following CSV file this file defined which Linux machine exist in the system and there ip's my target is to create host file from this file please advice how to create host file as example 1 from my CSV file ( I need to match the IP address from CSV file and put it on the first field of the host file , then match the LINUX name and locate this name in the sec field – as example 1 ) remark - should be performed by sed or awk or perl .. , I need to write the solution in my bash script CSV file , machine , VM-LINUX1 , SZ , Phy , 10.213.158.18 , PROXY , VM-LINUX2 , SZ , 10.213.158.19 , OLD HW , VM-LINUX3 , SZ , 10.213.158.20 , , VM-LINUX4 , SZ , Phy , 10.213.158.21 , , VM-LINUX5 , SZ , Phy , OUT , EXT , LAN3 , 10.213.158.22 , INTERNAL , VM-LINUX6 , SZ , Phy , 10.213.158.23 , , server , new HW , VM-LINUX7 , SZ , Phy , 10.213.158.24 , OUT, LAN3 , VM-LINUX8 , SZ , 10.213.158.25 , OLD HW , machine , VM-LINUX9 , SZ , Phy , INT , 10.213.158.26 , LAN2, AN45, , VM-LINUX10 , SZ , Phy , 10.213.158.27 , , VM-LINUX11 , SZ , Phy , LAN5 , 10.213.158.28 , example 1 ( host file ) 10.213.158.18 VM-LINUX1 10.213.158.19 VM-LINUX2 10.213.158.20 VM-LINUX3 10.213.158.21 VM-LINUX4 10.213.158.22 VM-LINUX5 10.213.158.23 VM-LINUX6 10.213.158.24 VM-LINUX7 10.213.158.25 VM-LINUX8 10.213.158.26 VM-LINUX9 10.213.158.27 VM-LINUX10 10.213.158.25 VM-MACHINE8 10.213.158.26 STAR9 10.213.158.27 TOP10 10.213.158.28 SERVER11

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• postfix smtpd rejecting mail from outside network match_list_match: no match

  - by Loopo

  My postfix (V: 2.5.5-1.1) running on ubuntu server (9.04) started to reject mail arriving in from outside about 2 weeks ago. Doing a "manual" session via telnet shows that the connection is always closed after the MAIL FROM: [email protected] line is input, with the message "Connection closed by foreign host." Doing the same from another client inside the LAN works fine. In the log files I get the line "lost connection after MAIL from xxxxx.tld[xxx.xxx.xxx.xxx]" This is after some lines like: match_hostaddr: XXX.XXX.XXX.XXX ~? [::1]/128 match_hostname: XXXX.tld ~? 192.168.1.0/24 ... match_list_match: xxx.xxx.xxx.xxx: no match which seem to suggest some kind of filter which checks for allowed addresses. I have been unable to locate where this filter lives, or how to turn it off. I'm not even sure if that's what's causing my problem. Connections from inside the LAN don't get disconnected even though they also show a "match_list_match: ... no match" line. I didn't change any configuration files recently, below is my main.cf as it currently stands. I don't really know what all the parameters do and how they interact. I just set it up initially and it worked fine (up to recently). smtpd_banner = $myhostname ESMTP $mail_name (GNU) biff = no readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/server.crt smtpd_tls_key_file=/etc/ssl/private/server.key #smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_sasl_auth_enable = no smtp_use_tls=no smtp_sasl_password_maps = hash:/etc/postfix/smtp_auth myhostname = XXXXXXX.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = XXXX.XXXX.com, XXXX.com, localhost.XXXXX.com, localhost relayhost = XXX.XXX.XXX.XXX mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.1.0/24 mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all smtpd_sasl_local_domain = #smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous smtpd_sasl_authenticated_header = yes broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_unauth_ when checking the process list, postfix/smtpd runs as smtpd -n smtp -t inet -u -c -o stress -v -v Any clues?

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• ntop to analyse bandwidth usage on multiple ASA 5505

  - by dunxd

  I have set up a netflow server at our data centre, which is connected via VPN to ~40 remote offices using Cisco ASA 5505. The aim is to analyse usage data and find out exactly how the remote connections are being used. I followed through http://techowto.files.wordpress.com/2008/09/ntop-guide.pdf to set up ntop and https://supportforums.cisco.com/docs/DOC-6114 to set up the ASAs. I can see from the Plugin Netflow Statistics page that netflow packets from my ASAs are being received - the counter is increasing. However, I am not seeing any breakdown on the Global Traffic Statistic page after switching to the Netflow interface. I'm just seeing a pie chart showing 100% traffic for eth0. The interfaces and documentation are a little hard to follow so I am not sure I have got things configured correctly. When setting up my NetFlow-device.2 I can specify Virtual NetFlow Interface Network Address - the web UI says This value is in the form of a network address and mask on the network where the actual NetFlow probe is located. is this a Network address (e.g. 192.168.0.0/24) or an actual host IP address (192.167.0.1/24)? If that should be a network address, is this the network in which one of my ASAs is or the network in which my ntop server is? If a host IP address, is this the IP address used by eth0 on my ntop server, the IP address of an ASA, or something else? Do I need a separate virtual interface for each ASA I am collecting netflow data from? Any guidance would be greatly welcome.

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• weird routes automatically being added to windows routing table

  - by simon

  On our windows 2003 domain, with XP clients, we have started seeing routes appearing in the routing tables on both the servers and the clients. The route is a /32 for another computer on the domain. The route gets added when one windows computer connects to another computer and needs to authenticate. For example, if computer A with ip 10.0.1.5/24 browses the c: drive of computer B with ip 10.0.2.5/24, a static route will get added on computer B like so: dest netmask gateway interface 10.0.1.5 255.255.255.255 10.0.2.1 10.0.2.5 This also happens on windows authenticated SQL server connections. It does not happen when computers A and B are on the same subnet. None of the servers have RIP or any other routing protocols enabled, and there are no batch files etc setting routes automatically. There is another windows domain that we manage with a near identical configuration that is not exhibiting this behaviour. The only difference with this domain is that it is not up to date with its patches. Is this meant to be happening? Has anyone else seen this? Why is it needed when I have perfectly good default gateways set on all the computers on the domain?!

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• Xmodmap fails to remap modifier keys

  - by ZyX

  When I try to move keys, so that I have CapsLock on escape, Control on CapsLock and Escape on left control, I get the following error: % xmodmap ~/.Xmodmap X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 118 (X_SetModifierMapping) Value in failed request: 0x17 Serial number of failed request: 15 Current serial number in output stream: 15 That is the code that fails: remove Lock = Caps_Lock ! ESC keycode 9 = Caps_Lock add Lock = Caps_Lock remove Control = Control_L ! CapsLock keycode 66 = Control_L add control = Control_L ! Control_R keycode 37 = Escape ! 2*Meta_L keycode 148 = Meta_L add mod1 = Meta_L If I comment out all lines that start with either add or remove it runs without any errors, but does not do what I want. Program versions (Gentoo x86 (stable)): xorg-server-1.7.6 xmodmap-1.0.4 xf86-input-evdev-2.3.2 Xorg.conf: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 1.0 (buildmeister@builder63) Fri Aug 14 17:54:58 PDT 2009 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" InputDevice "Evdev Keyboard" "CoreKeyboard" InputDevice "Evdev Mouse" "CorePointer" EndSection Section "Module" Disable "dri" Disable "dri2" Disable "record" EndSection Section "InputDevice" Identifier "Evdev Keyboard" Driver "evdev" Option "Device" "/dev/input/event2" Option "CoreKeyboard" Option "AutoRepeat" "500 25" Option "XkbRules" "xorg" Option "xkb_rules" "xorg" Option "XkbModel" "yahoo" Option "xkb_model" "yahoo" Option "XkbLayout" "dvp2" # ,ru2 Option "xkb_layout" "dvp2" # ,ru2 # Option "XkbVariant" "" # ,winkeys Option "XkbOption" "grp_led:scroll,grp:rctrl_toggle,compose:rwin,grp:lwin_switch" # grp:lwin_switch EndSection Section "InputDevice" Identifier "Evdev Mouse" Driver "evdev" Option "CorePointer" Option "Device" "/dev/input/event3" Option "Name" "Genius Ergo Mouse" Option "HWHEELRelativeAxisButtons" "7 6" Option "WHEELRelativeAxizButtons" "4 5" Option "SendCoreEvents" "true" Option "Buttons" "11" EndSection Section "Files" FontPath "/usr/share/fonts/misc" FontPath "/usr/share/fonts/Type1" FontPath "/usr/share/fonts/100dpi" FontPath "/usr/share/fonts/75dpi" FontPath "/usr/share/fonts/terminus" # FontPath "/usr/share/fonts/intlfonts" FontPath "/usr/share/fonts/ttf-bitstream-vera" # FontPath "/usr/share/fonts/ttf" FontPath "/usr/share/fonts/corefonts" FontPath "/usr/share/fonts/paratype" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection Section "Extensions" Option "Composite" "Disable" EndSection Section "ServerFlags" # Option "XkbDisable" "false" # Option "AutoAddDevices" "false" Option "DontVTSwitch" "false" Option "DontZap" "false" # Option "DontZoom" "true" EndSection Everything worked before update.

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• Natting trafic from a tunnel to internet

  - by mezgani

  I'm trying to set up a GRE tunnel between a linux box and a router (LAN), and I'm having a few problems which seem to depend to my iptables configuration. Watching with tcpdump on linux box, I can see packets coming with flags GREv0, all i need right know is forwarding this data to internet, found here some trace : iptables -F iptables -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -t nat -F iptables -t nat -X iptables -t nat -P PREROUTING ACCEPT iptables -t nat -P POSTROUTING ACCEPT iptables -t nat -P OUTPUT ACCEPT iptables -t mangle -F iptables -t mangle -X iptables -t mangle -P PREROUTING ACCEPT iptables -t mangle -P OUTPUT ACCEPT iptables -A INPUT -p 47 -j ACCEPT iptables -A FORWARD -i ppp0 -o cloud -j ACCEPT iptables -A FORWARD -i cloud -o ppp0 -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE echo "1" /proc/sys/net/ipv4/ip_forward cloud Link encap:UNSPEC HWaddr C4-CE-7A-2E-F2-BF-DD-C0-00-00-00-00-00-00-00-00 inet adr:10.3.3.3 P-t-P:10.3.3.3 Masque:255.255.255.255 UP POINTOPOINT RUNNING NOARP MTU:1476 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:124 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 lg file transmission:0 RX bytes:0 (0.0 B) TX bytes:10416 (10.1 KiB) Table de routage IP du noyau Destination Passerelle Genmask Indic MSS Fenêtre irtt Iface 196.206.120.1 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 192.168.0.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.3.3.0 0.0.0.0 255.255.255.0 U 0 0 0 cloud 0.0.0.0 196.206.120.1 0.0.0.0 UG 0 0 0 ppp0 root@aldebaran:~# ip route 196.206.120.1 dev ppp0 proto kernel scope link src 196.206.122.46 192.168.0.0/24 dev eth0 proto kernel scope link src 192.168.0.18 10.3.3.0/24 dev cloud scope link default via 196.206.120.1 dev ppp0

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• Replicated MongoDB server slower than simple shards

  - by displayName

  I tried to compare the performance of a sharded configuration against a sharded and replicated configuration. The sharded configuration consists of 8 shards each running on three different machines thereby constituting a total of 24 shards. All 8 of these shards run in the same partition on each machine. The sharded and replicated version is 8 shards again just like plain sharding, and all 8 mongods run on the same partition in each machine. But apart from this, each of these three machine now run additional 16 threads on another partition which serve as the secondary for the 8 mongods running on other machines. This is the way I prepared a sharded and replicated configuration with data chunks having replication factor of 3. Important point to note is that once the data has been loaded, it is not modified. So after primary and secondaries have synchronized then it doesn't matter which one i read from. To run the queries, I use an entirely different machine (let's call it config) which runs mongos and this machine's only purpose is to receive queries and run them on the cluster. Contrary to my expectations, plain sharding of 8 threads on each machine (total = 3 * 8 = 24) is performing better for queries than the sharded + replicated configuration. I have a script written to perform the query. So in order to time the scripts, I use time ./testScript and see the result. I tried changing the reading preference for replicated cluster by logging to mongo of config and run db.getMongo().setReadPref('secondary') and then exit the shell and run the queries like time ./testScript. The questions are: Where am i going wrong in the replication? Why is it slower than its plain sharding version? Does the db.getMongo().ReadPref('secondary') persist when i leave the shell and try to perform the query? All the four machines are running Linux and i have already increased the ulimit -n to 2048 from initial value of 1024 to allow more connections. The collections are properly distributed and all the mongods have equal number of chunks. Goes without saying that indices in both configurations are the same.

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• how do you add an A record for a root domain

  - by nbv4

  this seems really simple, but I can't figure it out. I'm using xname.org since it's free and I own a bunch of domains spread over a few different registrars. The setup I desire is very simple: one A record that points the bare domain name to my server, plus a wildcard CNAME record pointing all subdomains to the same server. So if the user goes to domain.com it will point them to 285.24.435.75, if they go to www.domain, blah.domain.com, or any other sub domain, they'll get sent to 285.24.435.75. All the examples I read on the internet about setting up A records all have the A record set to a subdomain such as www. WWW is deprecated so I want to have noting to do with it. Currently my xname.org zone looks like this: $TTL 86400 ; Default TTL domain.com. IN SOA ns0.xname.org. nbvfour.gmail.com. ( 2010052503 ; serial 10800 ; Refresh period 3600 ; Retry interval 604800 ; Expire time 10800 ; Negative caching TTL ) $ORIGIN domain.com. IN NS ns2.xname.org. IN NS ns0.xname.org. IN NS ns1.xname.org. @ IN A 65.49.73.148 * IN CNAME domain.com The '@' symbol is something that the godaddy domain interface uses to mean "this root domain', but that may have been specefic to that interface and has no meaning here. Before I had a 'www' entry in the A rcords and it worked in the sense that I could ping 'www.domain.com' and it returned a response, but pinging the root domain 'domain.com' returned "no host found".

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• Network to network VPN Centos 5

  - by Atul Kulkarni

  I am trying to follow "http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-vpn.html#s1-ipsec-net2net" I have come up with the following On local router machine: in my ifcfg-ipsec0: ONBOOT=yes IKE_METHOD=PSK DSTGW=10.5.27.1 SRCGW=10.6.159.1 DSTNET=10.5.27.0/25 SRCNET=10.6.159.0/24 DST=205.X.X.X TYPE=IPSEC I have /etc/sysconfig/network-scripts/keys-ipsec0 file in place. On Remote Machine in the cloud if have /etc/sysconfig/network-scripts/ifcfg-ipsec1: TYPE=IPSEC ONBOOT=yes IKE_METHOD=PSK SRCGW=10.5.27.1 DSTGW=10.6.159.1 SRCNET=10.5.27.124/25 DSTNET=10.6.159.0/24 DST=38.x.x.x with its respective /etc/sysconfig/network-scripts/key-ipsec1 file. The DST in both cases are NAT'd external IPs. Is that a problem? I have made changes for port forwarding as well. When I try to bring the interfaces up it gives me output "RTNETLINK answers: Invalid argument". I am confused now and don't know what more to do? Any place I can digup what parameters were wrong? I really appreciate any help I can get. Thanks and Regards, Atul.

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• Have only read access to Samba

  - by Tahir Malik

  Hi I've been struggling a lot with Samba on Centos 5.5 lately. I develop in Windows 7 and send files through scp (ant task), but it's to slow and wanted to setup thoroughly samba. After installing and following some guides I've done the following: Disable firewall (iptables) Disable SelLinux (didn't do that at the start, but didn't help either) setup my smbusers file to map my windows user to root (root = "Tahir Malik" -- works) added a current user mitco to the sambapassdb with the command smbpasswd -a mitco , because the windows user had only read access So both the users have read access to my share. Here is my smb.conf snippit: [global] workgroup = MITCO server string = Samba Server Version %v netbios name = centos ; interfaces = lo eth0 192.168.12.2/24 192.168.13.2/24 ; hosts allow = 127. 192.168.12. 192.168.13. [alf4] comment = Alfresco 4 path = /opt read only = no valid users = mitco, mitco force user = root force group = root admin users = mitco , mitco writeable = yes ; browseable = yes What also maybe important is that the /opt is only writable by root, but that shouldn't matter because I use the force user and group or admin users. The log file : [2012/09/29 07:43:44, 0] smbd/server.c:main(958) smbd version 3.0.33-3.39.el5_8 started. Copyright Andrew Tridgell and the Samba Team 1992-2008 [2012/09/29 07:43:59, 1] smbd/service.c:make_connection_snum(1085) mitco-tahir (192.168.13.1) connect to service alf4 initially as user root (uid=0, gid=0) (pid 5228)

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• NAT confusion regarding cisco ASA5510

  - by LonelyLonelyNetworkN00b

  I'm setting up my first cisco firewalls. A little information first:I have two asa5510 setup in a working active/standby pair. From my ISP i have two public subnets. A /29 and a /26. On my DMZ interface i have the /26 configured. On my WAN Interface i have configured the /29 IPs. My isp routes the /26 via the /29 primary IP. I'm running ASA 8.2. I've turned NAT-Control off, because i don't want to use nat for for other than some internal interfaces. In essence i don't want to use NAT unless i specify it. I have a internal interface with the network of 192.168.100.0/24. I've tried setting up nat limke this: nat (inside) 1 192.168.100.0 255.255.255.0 global (WAN) 1 interface I was under the impression that this would let connections that was going from 192.168.100.0/24 and out the WAN interface to be Port-Address-translated. I'm not getting this to work for some reason. Inside interface has security level of 100, and wan has security level of 0.

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• NIC are not advertising Correct Speeds

  - by Squidly

  I have an IBM x336 that is not advertising the proper LINK speeds. One interface is the other is not. I've tried to Force it to 1000/Full but then it just shows link down. I have confirmed the switch is set to auto negotiate like my switches. I have also changed out my Ethernet Cables. I'm at a loss where to look further. I have verified that it will connect at 1G on a different swtich. This also has happened on two different servers on the same switch. This is my output from mii-tool -v for each interface. eth0: negotiated 100baseTx-FD, link ok product info: vendor 00:08:18, model 24 rev 0 basic mode: autonegotiation enabled basic status: autonegotiation complete, link ok capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD eth1: negotiated 1000baseT-FD flow-control, link ok product info: vendor 00:08:18, model 24 rev 0 basic mode: autonegotiation enabled basic status: autonegotiation complete, link ok capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD advertising: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control link partner: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

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• management network to a network port for additional ones munin and monit

  - by paolo

  management network to a network port for additional ones munin and monit I want to build a separate Netzwek for server management. I have several network cards a linux / debian / ubuntu with computer. Set both network cards sin in the /etc/network/interfaces. # The primary network interface #allow-hotplug eth0 #iface eth0 inet dhcp auto eth0 iface eth0 inet static address 10.0.0.240 netmast 255.255.255.0 network 10.0.0.0 brodacast 10.0.0.255 gateway 10.0.0.254 auto eth1 iface eth1 inet static address 10.0.10.240 netmast 255.255.255.0 network 10.0.10.0 brodacast 10.0.10.255 post-up ip route add 10.0.0.0/24 dev eth0 src 10.0.0.240 table eth0-WAN post-up ip route add default via 10.0.0.254 table eth0-WAN post-up ip route add 10.0.10.0/24 dev eth1 src 10.0.10.240 table eth1-LAN post-up ip route add default via 10.0.10.200 table eth1-LAN post-up ip rule add from 10.0.0.240 table eth0-WAN post-up ip rule add from 10.0.10.240 table eth1-LAN still i adjusted / etc/iproute2/rt_tables and following routes set up in the /etc/network/interfaces I want to have both applications and the network interface separately as munin and monit only on eth1 and not have to eth0. it goes to the reboot but sometimes not always. # Traceroute-i eth1 10.0.10.200 not go what am I doing wrong?

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• Translating IPTables rule to UFW

  - by Dario Fumagalli

  we are using an Ubuntu 12.04 x64 LTS VPS. Firewall being used is UFW. I have setup a Varnish + LEMP setup. along with other things, including an Openswan IPSEC VPN from our office to the VPS data center. A second in house Ubuntu box is to act as MySQL slave and fetch data from the VPS through the VPN. Master's ppp0 is seen as 10.1.2.1 from the slave, they ping etc. I have done the various required tasks but I can't get the client (slave) MySQL (nor telnet 10.1.2.1 3306) to access the master through the VPN unless I issue this fairly obvious IPTables command: iptables -A INPUT -s 10.1.2.0/24 -p tcp --dport 3306 -j ACCEPT I willingly forced the accepted input to come from the last octet. With this rule everything works just fine! However I want to translate this command to UFW syntax so to keep everything in one place. Now I admit being inexperienced with UFW, I prepared rules like: ufw allow proto tcp from 10.1.2.0/24 port mysql and 2-3 variations involving specifying 3306 instead of mysql, specifying a target IP (MySQL's my.cnf at the moment is configured as 0.0.0.0) and similar but I just don't seem to be able to replicate the simple iptables rule in a functional way. Anyone could kindly give me a suggestion that is not to dump UFW? Thanks in advance.

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• mod_rpaf with apache error_log

  - by Camden S.

  I'm using mod-rpaf with Apache 2.4 and it's working properly (showing the real client IP's) in my Apache access_log... but not in my error_log. My error log just shows the client IP address of the proxy server (my load balancer in this case) Here's an example of what I see in my error_log where 123.123.123.123 is the IP of my load balancer/proxy. == /usr/local/apache2/logs/error_log <== [Tue Jun 05 20:24:31.027525 2012] [access_compat:error] [pid 9145:tid 140485731845888] [client 123.123.123.123:20396] AH01797: client denied by server configuration: /wwwroot/private/secret.pdf The exact same request produces the following in my access_log where 456.456.456.456 is a real client IP (not the IP of the load balancer). 456.456.456.456 - - [05/Jun/2012:20:24:31 +0000] "GET /wwwroot/private/secret.pdf HTTP/1.1" 403 228 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:12.0) Gecko/20100101 Firefox/12.0" Here's my httpd.conf entry: # RPAF LoadModule rpaf_module modules/mod_rpaf-2.0.so RPAFenable On RPAFproxy_ips 127.0.0.1 123.123.123.123 RPAFsethostname On RPAFheader X-Forwarded-For What do I need to do to get the real IP addresses showing in my Apache error_log?

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• how to debug when xinetd says : got signal 17 (child exited)

  - by Faizan Shaik

  I am trying to start services vsftpd and sshd using xinetd. my config files are as follows. /etc/xinetd.conf defaults { instances = 60 log_type = FILE /var/log/xinetdlog log_on_success = HOST PID log_on_failure = HOST cps = 25 30 only_from = localhost } includedir /etc/xinetd.d /etc/xinetd.d/ftp service ftp { disable = no server = /usr/sbin/vsftpd server_args = -l user = root socket_type = stream protocol = tcp wait = no instances = 4 flags = REUSE nice = 10 log_on_success += DURATION HOST USERID only_from = 127.0.0.1 10.0.0.0/24 } /etc/xinetd.d/ssh service ssh { disable = no log_on_failure += USERID server = /usr/sbin/sshd user = root socket_type = stream protocol = tcp wait = no instances = 20 flags = REUSE only_from = 127.0.0.1 10.0.0.0/24 } Even though i've included only_from attribute, vsftp server as well as ssh server are refusing connection from localhost. while vsftp and ssh servers are working fine individually when i check with "service vsftpd start" and "service ssh start". when i did debug using "xinetd -d" throug terminal i got the output as 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} Started service: ftp 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} Started service: ssh 13/10/20@00:06:08: DEBUG: 3592 {cnf_start_services} mask_max = 8, services_started = 2 13/10/20@00:06:08: NOTICE: 3592 {main} xinetd Version 2.3.14 started with libwrap loadavg options compiled in. 13/10/20@00:06:08: NOTICE: 3592 {main} Started working: 2 available services 13/10/20@00:06:08: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3592 {main_loop} select returned 1 13/10/20@00:06:16: DEBUG: 3592 {server_start} Starting service ftp 13/10/20@00:06:16: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3607 {exec_server} duping 9 13/10/20@00:06:16: DEBUG: 3592 {main_loop} active_services = 2 13/10/20@00:06:16: DEBUG: 3592 {main_loop} select returned 1 13/10/20@00:06:16: DEBUG: 3592 {check_pipe} Got signal 17 (Child exited) 13/10/20@00:06:16: DEBUG: 3592 {child_exit} waitpid returned = 3607 13/10/20@00:06:16: DEBUG: 3592 {server_end} ftp server 3607 exited 13/10/20@00:06:16: DEBUG: 3592 {svc_postmortem} Checking log size of ftp service 13/10/20@00:06:16: INFO: 3592 {conn_free} freeing connection 13/10/20@00:06:16: DEBUG: 3592 {child_exit} waitpid returned = -1 both services are getting started but neither of them is working. after banging for 3-4 hours i still don't have any clue about this error. Any help would be appreciated. thanks!

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