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• Debian can't connect to internet using LAN

  - by tampe125

  I have a headless Raspberry Pi using Debian Wheezy. I have a wifi dongle and if I connect my Raspberry using it, everything works fine: I can connect to the Internet, I can ping, I can update. However, if I get down my wifi and set up the lan interface, I lost my internet connection. I still can connect locally, using my laptop, but the connection doesn't exit (ie ping is not working). Some useful info: cat /etc/network/interfaces auto lo auto eth0 iface eth0 inet static address 192.168.0.105 netmask 255.255.255.0 gateway 192.168.0.1 ping www.google.com (nothing request timed out) ifconfig eth0 Link encap:Ethernet HWaddr b8:27:eb:a2:b5:20 inet addr:192.168.0.105 Bcast:192.168.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1130 errors:0 dropped:0 overruns:0 frame:0 TX packets:1116 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:97223 (94.9 KiB) TX bytes:146140 (142.7 KiB) ping 192.168.0.1 PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data. ^C --- 192.168.0.1 ping statistics --- 19 packets transmitted, 0 received, 100% packet loss, time 18007ms cat /etc/resolv.conf nameserver 8.8.8.8 netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 well, I think that's all... Any ideas?

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• NTOP gives warnings on startup

  - by FR6

  I just installed ntop 1.4.4 and when I start it, it give me infinite warnings "packet truncated": ... RRD_DEBUG: umask 0066 RRD_DEBUG: DirPerms 0700 THREADMGMT: RRD: Started thread (t2992630672) for data collection THREADMGMT[t2992630672]: RRD: Data collection thread starting [p30923] INIT: Created pid file (/var/run/ntop.pid) THREADMGMT[t3086329552]: ntop RUNSTATE: INITNONROOT(3) Now running as requested user 'nobody' (99:99) Note: Reporting device initally set to 0 [eth0] (merged) THREADMGMT[t3086329552]: ntop RUNSTATE: RUN(4) THREADMGMT[t2982140816]: NPS(1): Started thread for network packet sniffing [eth0] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread starting [p30923] THREADMGMT[t2982140816]: NPS(eth0): pcapDispatch thread running [p30923] THREADMGMT[t3047009168]: SIH: Idle host scan thread running [p30923] THREADMGMT[t3057499024]: SFP: Fingerprint scan thread running [p30923] **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (10274->8232) **WARNING** packet truncated (8814->8232) **WARNING** packet truncated (8814->8232) ... Do I need to configure something? I tried to access the web interface (http://localhost:3000) but it does not work. Note: I'm on CentOS. EDIT: Not sure if it helps but there is my "ifconfig": eth0 Link encap:Ethernet HWaddr 00:16:76:BC:7E:77 inet addr:192.168.0.221 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::216:76ff:febc:7e77/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15496640 errors:0 dropped:0 overruns:0 frame:0 TX packets:19256813 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:836230629 (797.4 MiB) TX bytes:608496148 (580.3 MiB) Memory:dffe0000-e0000000

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• Cisco 3560+ipservices -- IGMP snooping issue with TTL=1

  - by Jander

  I've got a C3560 with Enhanced (IPSERVICES) image, routing multicast between its VLANs with no external multicast router. It's serving a test environment where developers may generate multicast traffic on arbitrary addresses. Everything is working fine except when someone sends out multicast traffic with TTL=1, in which case the multicast packet suppression fails and the traffic is broadcast to all members of the VLAN. It looks to me like because the TTL is 1, the multicast routing subsystem doesn't see the packets, so it doesn't create a mroute table entry. If I send out packets with TTL=2 briefly, then switch to TTL=1 packets, they are filtered correctly until the mroute entry expires. My question: is there some trick to getting the switch to filter the TTL=1 packets, or am I out of luck? Below are the relevant parts of the config, with a representative VLAN interface. I can provide more info as needed. #show run ... ip routing ip multicast-routing distributed no ip igmp snooping report-suppression ! interface Vlan44 ip address 172.23.44.1 255.255.255.0 no ip proxy-arp ip pim passive ... #show ip igmp snooping vlan 44 Global IGMP Snooping configuration: ------------------------------------------- IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Disabled TCN solicit query : Disabled TCN flood query count : 2 Robustness variable : 2 Last member query count : 2 Last member query interval : 1000 Vlan 44: -------- IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Multicast router learning mode : pim-dvmrp CGMP interoperability mode : IGMP_ONLY Robustness variable : 2 Last member query count : 2 Last member query interval : 1000

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• UDP blocked by Windows XP Firewall when sending to local machine

  - by user36367

  I work for a software development company but the issue doesn't seem to be programming-related. Here is my setup: Windows XP Professional with Service Pack 3, all updated Program that sends UDP datagrams Program that receives UDP datagrams Windows Firewall set to allow inbound UDP datagrams on a specific port (Scope: Subnet) If I send a UDP datagram on any port to other, similar machines, it goes through. If I send the UDP datagram to the same computer running the program that sends (whether using broadcast, localhost IP or the specific IP of the machine), the receiver program gets nothing. I've traced the problem down to the Windows XP Firewall, as Windows 7 does not have this problem (and I do not wish to sully my hands with Vista). If the exception I create for that UDP port in the WinXP firewall is set for a Scope of Subnet the datagram is blocked, but if I set it to All Computers or specifically enter my network settings (192.168.2.161 or 192.168.2.0/255.255.255.0) it works fine. Using different UDP ports makes no difference. I've tried different programs to reproduce this problem (ServerTalk to send and either IP Port Spy or PortPeeker to receive) to make sure it's not our code that's the issue, and those programs' datagrams were blocked as well. Also, that computer only has one network interface, so there are no additional network weirdness. I receive my IP from a DHCP server, so this is a straightforward setup. Given that it doesn't happen in Windows 7 I must assume it's a defect in the Windows XP Firewall, but I'd think someone else would have encountered this problem before. Has anyone encountered anything like this? Any ideas?

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• UDP blocked by Windows XP Firewall when sending to local machine

  - by user36367

  Hi there, I work for a software development company but the issue doesn't seem to be programming-related. Here is my setup: - Windows XP Professional with Service Pack 3, all updated - Program that sends UDP datagrams - Program that receives UDP datagrams - Windows Firewall set to allow inbound UDP datagrams on a specific port (Scope: Subnet) If I send a UDP datagram on any port to other, similar machines, it goes through. If I send the UDP datagram to the same computer running the program that sends (whether using broadcast, localhost IP or the specific IP of the machine), the receiver program gets nothing. I've traced the problem down to the Windows XP Firewall, as Windows 7 does not have this problem (and I do not wish to sully my hands with Vista). If the exception I create for that UDP port in the WinXP firewall is set for a Scope of Subnet the datagram is blocked, but if I set it to All Computers or specifically enter my network settings (192.168.2.161 or 192.168.2.0/255.255.255.0) it works fine. Using different UDP ports makes no difference. I've tried different programs to reproduce this problem (ServerTalk to send and either IP Port Spy or PortPeeker to receive) to make sure it's not our code that's the issue, and those programs' datagrams were blocked as well. Also, that computer only has one network interface, so there are no additional network weirdness. I receive my IP from a DHCP server, so this is a straightforward setup. Given that it doesn't happen in Windows 7 I must assume it's a defect in the Windows XP Firewall, but I'd think someone else would have encountered this problem before. Has anyone encountered anything like this? Any ideas? Thanks in advance!

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• Flow of packet in network

  - by user58859

  I can't visualize in my mind the network traffic flow. eg. If there are 15 pc's in a LAN. When packet goes from router to local LAN, do it passes all the computers? Means did it goes to ehernet card of every computer and those computers accept the packet based on their physical address. To which pc the packet will go first? To the nearest to the router? What happen if that first pc captures that packet(though it is not for it)? What happens when a pc broadcast a message? Do it have to generate 14 packets for all the pc's or only one packet reach to all pc's? If it is one packet and captured by first pc, how other pc's can get that? I can't imagine how this traffic is exactly flows? May be my analogy is completely wrong. Can anybody explain me this? Thanks in advance.

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• Live Screencast under Linux

  - by OmnipotentEntity

  I was having some difficulty with running a Live Screencast under Linux. I've found jtvlc and tried using that, but whenever I use it the stream comes out either blank or lagged with extremely high latency. I have a fast internet connection and a fast computer, but am I perhaps taxing it too much? Any ideas on what I could possibly be doing wrong? # 1. Get an account on http://www.justin.tv/ # 2. Copy streaming key from: http://www.justin.tv/broadcast/adv_other # 2. Install VLC: http://www.videolan.org/vlc/ # 3. Get Win/Mac/Lin Stream Client: \ # http://apiwiki.justin.tv/mediawiki/index.php/Linux_Broadcasting_API # 4. Adjust the vlc parameters to your liking and run VLC like this #!/bin/bash cvlc screen:// --input-slave=pulse:// \ --screen-width 1920 \ --screen-height 1080 \ --screen-fps 5 \ -v input_stream \ --sout='#duplicate{ dst="transcode{ scale=1, venc=x264{ keyint=60 }, vcodec=h264, vb=600, acodec=mp4a, ab=32, channels=2, samplerate=22050 } :rtp{dst=127.0.0.1,port=1234,sdp=file:///tmp/vlc.sdp} "}' \ --sout-transcode-threads=4 & sleep 2 # 5. Run JTVLC to stream like this: ./jtvlc/jtvlc omnipotententity censored /tmp/vlc.sdp # Notes: #- If you want to see what you're about to stream add 'dst=display, ' # before 'dst="transcode[' # More about the VLC parameters: http://wiki.videolan.org/Documentation:Modules/screen

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• Linux server: Dropped packets

  - by Lars

  I see dropped packets using ifconfig on my eth0 interface: eth0 Link encap:Ethernet HWaddr 00:15:17:0d:03:ca inet addr:10.0.1.2 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1 RX packets:30268348 errors:0 dropped:70721 overruns:0 frame:0 TX packets:133076885 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:8699434077 (8.6 GB) TX bytes:194937313025 (194.9 GB) Interrupt:16 Memory:feae0000-feb00000 When i use ethtool -S i dont see anything wrong: NIC statistics: rx_packets: 30267138 tx_packets: 133074510 rx_bytes: 8699356158 tx_bytes: 194934147340 rx_broadcast: 35296 tx_broadcast: 5435 rx_multicast: 0 tx_multicast: 0 rx_errors: 0 tx_errors: 0 tx_dropped: 0 multicast: 0 collisions: 0 rx_length_errors: 0 rx_over_errors: 0 rx_crc_errors: 0 rx_frame_errors: 0 rx_no_buffer_count: 0 rx_missed_errors: 0 tx_aborted_errors: 0 tx_carrier_errors: 0 tx_fifo_errors: 0 tx_heartbeat_errors: 0 tx_window_errors: 0 tx_abort_late_coll: 0 tx_deferred_ok: 0 tx_single_coll_ok: 0 tx_multi_coll_ok: 0 tx_timeout_count: 0 tx_restart_queue: 0 rx_long_length_errors: 0 rx_short_length_errors: 0 rx_align_errors: 0 tx_tcp_seg_good: 5757001 tx_tcp_seg_failed: 0 rx_flow_control_xon: 8649 rx_flow_control_xoff: 62072 tx_flow_control_xon: 0 tx_flow_control_xoff: 0 rx_long_byte_count: 8699356158 rx_csum_offload_good: 30212111 rx_csum_offload_errors: 0 rx_header_split: 10857552 alloc_rx_buff_failed: 0 tx_smbus: 0 rx_smbus: 0 dropped_smbus: 0 rx_dma_failed: 0 tx_dma_failed: 0 I am running Ubuntu 12.04 with kernel 3.2.0-30-generic #48-Ubuntu SMP I have pinged every device on my internal network for about 24 hours, without packet loss. Also checked my router and my interface to the WAN, also no errors there. Does anyone have any clue?

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• Default IPv6 route on debian squeeze does not come up after boot

  - by Georg Bretschneider

  I have a problem with my default IPv6 route not coming up after boot on a Debian Squeeze system. This is my config (/etc/network/interfaces): # Loopback device: auto lo iface lo inet loopback iface lo inet6 loopback # device: br0 auto br0 iface br0 inet static bridge_ports eth0 bridge_fd 0 address 88.198.62.xx broadcast 88.198.62.63 netmask 255.255.255.224 gateway 88.198.62.33 up route add -net 88.198.62.32 netmask 255.255.255.224 gw 88.198.62.33 br0 iface br0 inet6 static address 2a01:4f8:131:10x::2 netmask 64 gateway 2a01:4f8:131:100::1 up route -A inet6 add 2a01:4f8:131:100::1/59 dev br0 My inet comes up alright, but I have to exec the route command manually after boot to make IPv6 work. Otherwise I can't even reach my gateway. This is the output of ip -6 route show after boot: 2a01:4f8:131:10x::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 unreachable fe80::/64 dev lo proto kernel metric 256 error -101 mtu 16436 advmss 16376 hoplimit 4294967295 fe80::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295 I already tried it with: up ip -6 route add 2a01:4f8:131:100::1 dev br0 up ip -6 route add default via 2a01:4f8:131:100::1 dev br0 in /etc/network/interfaces, but with the same results. If I execute those commands manually on my shell, everything starts working nicely. And yes, I tried with post-up instead of up, too. Only other changes I made was to activate ip forwarding for IPv6, because I want to run some LXC containers on that system.

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• how to setup a bridge with 2 NICs and few virtual machines

  - by Bond

  Here is my situation. I have a server with 2 NICs. I have installed virtual box and I have created a few Guest Operating Systems on it. I want these Virtual Machines to be using a bridge.NIC2 would be used to setup this bridge and NIC1 would be connected to corporate network.I am not clear with how should I go on doing this. /etc/network/interfaces is the file which I am trying to modify etc. My approach is following 1) Define a configuration file /etc/network/interfaces 2) Create IPTABLES as how NIC1 will forward the packets to Bridge on NIC2 Now comes the problem I do not understand what is the meaning of following lines in the configuration file auto lo iface lo inet loopback # The primary network interface auto eth2 iface eth2 inet manual auto br0 iface br0 inet static address 192.168.1.14 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.10 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers 192.168.13.2 dns-search myserver.net bridge_ports eth2 bridge_fd 9 bridge_hello 2 bridge_maxage 12 bridge_stp off So any pointers to what should be the entries of /etc/network/interfaces file. So that I understand which parameter is to be used when and where that would help me.

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• WOL doesn't work if set to anything other than `a` but this setting makes it boot all the time

  - by Elton Carvalho

  I manage a small "cluster" of 4 Xeon machines with Intel boards in my lab. They are all plugged to a 5-port 3-Com switch with static IP addresses like 10.0.0.x. They are all running OpenSuse 11.4 and their /home/ is served by one of the machines (node00) via NFS. They are plugged to an UPS that can keep them on for ca. 15 minutes, but there are lots of electric shortages due to "unscheduled maintenace" that are longer than this. So they end up being powered down without notice. If I set the BIOS to turn them on after power shortages, the issue is that they all boot at the same time and, if node00 decides to run fsck in the /home/ partition, it does not finish booting before the others try to NFS mount their /home/. I am trying to make wake on lan work, so I can choose to boot the NFS clients only after the server has successfully booted. The problem is that when I run ethtool I get an output like this: Supports Wake-on: pumbag Wake-on: g Theoretically, it is set to wake on MagicPacket(tm), according to the manual. But sending the WOL packet using wol -i 10.0.0.255 $MACADDR does not wake up the box after I shut it down with halt. The ethernet link led blinks after I send the packet, so it appears to be getting to the machine. However, if I set it up with ethtool -s eth1 wol bag, the machine always wakes up right after halting, even if I don't send the Magic packet. This means that the device can wake up with LAN activity, but seems to be ignoring the magic packet. Setting wol ag does not wake the box with the MagicPacket. Does setting wol a mean that it should boot with any broadcast message? How can I diagnose the issue of the machine not waking up with the MagicPacket even though I am sending it and it's set up to wake up with it? Thanks in advance!

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• very slow internet with Linksys WRT54GL only in wireless mode (wired is OK)

  - by gojira

  I bought a new Cisco Linksys WRT54GL router to connect my laptop (running Windows 7) to the internet. I installed Tomato 1.28 firmware on the router. When I connect the laptop to the router via ethernet cable, everything is fine and I get extremely fast up- and download speeds. When I connect wirelesssly however, websites load extremely slow - it takes dozens of seconds to load a website! <-- This is my question, how can I fix the wireless speed issue? Gmail for example is unusable this way. I tried speedtest.net, but this always fails in the upload part of the test so I can't even test the bandwidth (could the fact that it fails in the upload part, not the download part, be an indication what the problem is?!). I have isolated the problem a bit, I am convinced it has to do either with the router itself, the router settings, or the settings of the wireless connection in Win 7. Because previously, I was using another router by Buffalo and I had no problems whatsoever. I have tried to reproduce the settings from the Bufallo router as closely as possible on the Linksys router (same channel, same encryption etc). The download speed problem only occurs with the Linksys router, and only in wireless mode! When I exchange the Linksys router with the Buffalo router I have here for testing, the wireless speed is up to normal again. Also, before I had installed the Tomato firmware I had exactly the same problem, so it has nothing to do with the firmware itself. Notes & things I already tried: Changing the channel: does not seem to affect anything, I am also on the same channel (10) which I was previously on when I had a Buffalo router. QoS is off. Ping to the router itself is OK, ~ 1 ms. Some current settings of the linksys router: WAN / Internet Type: DHCP Wirelesss Mode: Access Point B/G Mode: Mixed Broadcast: check Channel: 10 - 2.457 GHz Security: WPA2 Personal Encryption: AES

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• Only tunnel certain applications via OpenVPN

  - by jinjin

  Hi, I've purchased a VPN solution, it works correctly when I have "redirect-gateway def1" in the configuration file (routing all traffic through the VPN). However when I remove that line from the configuration file, I am still able to ping-out of the machine (ping -I tap0), however I cannot ping the IP assigned to the machine (it's a public ip), i get the error: Destination Host Unreachable. I only want to have certain applications sending traffic through the VPN tunnel (eg: ZNC, irssi), all of which i can select which IP they use. However they can't recieve any data, making the tunnel essentially useless to me when disabling redirect-gateway. Any ideas on how to allow specific applications use the tunnel, without of forcing everything to go through it? My configuration file is as follows: dev tap remote #.#.#.# float #.#.#.# port 5129 comp-lzo ifconfig #.#.#.# 255.255.255.128 route-gateway #.#.#.# #redirect-gateway def1 secret key.txt cipher AES-128-CBC The output of ifconfig -a when the tunnel is connected: tap0 Link encap:Ethernet HWaddr 00:ff:47:d3:6d:f3 inet addr:#.#.#.# Bcast:#.#.#.# Mask:255.255.255.255 inet6 addr: <snip> Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:612 errors:0 dropped:0 overruns:0 frame:0 TX packets:35 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:100 RX bytes:25704 (25.1 KiB) TX bytes:6427 (6.2 KiB) EDIT: the Bcast:#.#.#.# (ifconfig) is different from route-gateway #.#.#.# (openvpn) if that makes any difference.

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• wireless router - configuring for low-latency, high traffic environment

  - by Mark C

  Hey all, I have a few questions about configuring a router to achieve low-latency, high speed throughput on a local area network that is not connected to the internet. I've read up on some stuff, but thought I would solicit some opinions here on what I've found and what I want to know.... Turn off SSID broadcast - it produces extraneous packets that all clients receive and reply (?) to. Not a huge deal, but it may help a bit. Mixed-mode off - I should attempt to have all devices using the same standard (e.g. 802.11n) and turn mixed-mode off. Any thoughts on security? Does having WEP or any of the WPA variants actually increase latency? Nothing super secure is going over this LAN so if turning security off made things better, that'd be cool. Any other thoughts or things to focus on to create the low latency environment I'm trying to go for would be great. Links to webpages and papers are also cool. I'm open to go through a bunch of stuff. Thanks in advance!

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• Why do I need a managed switch and which one should I buy?

  - by ascanio1

  I bought a 2nd router and I want both routers to have direct WAN access to the modem. One of the 2 routers directs VOIP traffic to a telephone line port. This VOIP service is provided by the cable carrier which also leases the modem & the router. The cable company technician told me that this VOIP line uses IPv6 addressing and therefore I must employ an IPv6 capable/compliant Giga Hub/Switch or my telephone line won't work anymore. Pls advise me (brand/model) an IPv6 compliant, 2 port, switch to purchase. Pls educate me: By reading this forum I thought that hubs broadcast traffic to all ports, regardless of which input/output is being used and so, theoretically, they have nothing to do with IP. Correct? Same story for unmanaged switches, where the only difference is that these latter devices route traffic only to those ports which are detected to be in use. Correct? I also understood that unmanaged switches route traffic simply by detecting hardware use and not by selecting specific IP traffic. Correct? Finally, there are managed switches which DO select traffic based on IP and, therefore, only these managed switches are involved with IPv6... Why would my cable company explicitly tell me, over and over, that I must use an IPv6 compliant switch? Why would they need a managed switch instead of an unmanaged one? Thanks in advance for helping me understand!

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• ProCurve ACL to prevent a subnet from leaving the switch

  - by kce

  I have a single HP ProCurve 2610 in a remote location that is connected in with the rest of the network via SHDSL. There are two Layer-3 networks on this segment. ACLs are setup to deny one subnet (192.0.2.0/24) from ever being able to leave the switch by virtue of being applied to port attached to the upstream connection. The other subnet should be permitted to freely leave the switch. Both subnets are on the same VLAN. Unfortunately SFlow very clearly show broadcast traffic from 192.0.2.0/24 on the upstream connection. ProCurve ACLs are not my strong suit but I feel like I'm missing something very simple here. ip access-list extended "Filter for Camera Network" deny ip 192.0.2.0 0.0.0.255 0.0.0.0 255.255.255.255 log permit ip 0.0.0.0 255.255.255.255 0.0.0.0 255.255.255.255 exit interface 24 name "DSL - UPLINK" access-group "Filter for Camera Network" in exit Unless I am mistaken traffic from 192.0.2.0/24 should be dropped as it crosses the uplink port (int 24) whereas all other traffic will be permited by the following default allow rule. What exactly am I missing here? EDIT: Firstly, why do you have two subnets contained in the same VLAN? Because that's how it was configured by a previous administrator and while it makes conceptual sense that a single subnet is "mapped" to a single VLAN there's no technical constraint that I am aware of that makes this have to be the case. Instead of filtering inbound traffic on your uplink, you should be filtering outbound traffic. The HP2600 series can only filter inbound traffic on interfaces. Should I change my filter to deny any to 192.0.2.0/24?

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• Ubuntu server apt-get says "(-5 - No address associated with hostname)"

  - by Srini

  I have a ubuntu 12.04 server. Running sudo apt-get update on it produces errors like this: W: Failed to fetch http://au.archive.ubuntu.com/ubuntu/dists/precise-backports/main/binary-i386/Packages Something wicked happened resolving 'au.archive.ubuntu.com:http' (-5 - No address associated with hostname) I am able to ping all the other hosts on the network and also Google's DNS 8.8.8.8. But am unable to ping www.google.com. So, I'm guessing something is wrong with my DNS setup, but not sure what. I use static IP and my /etc/network/interfaces looks like this: auto eth0 iface eth0 inet static address 192.168.1.50 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.0.255 gateway 192.168.1.1 #dns-nameserver 203.12.160.35 203.12.160.36 #nameserver 203.12.160.35 203.12.160.36 My /etc/resolv.conf and /etc/resolvconf/resolv.conf.d/base are both empty and my /etc/resolvconf/resolv.conf.d/original says: nameserver 192.168.1.1 Any help would be greatly appreciated. P.S. I've googled it a bit and the common resolution is to switch to DHCP which I don't want to do since this is my home server. Thanks Srini

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• Configure static IPv6 on Ubuntu

  - by Charles Offenbacher

  I'm trying to configure IPv6 on a dedicated Ubuntu server. My provider gave me a "/64" (whatever that is - I'm still confused) of IPv6 addresses. However, when I try to use them, I can't ping anything. What do I do? :( # ping6 ipv6.google.com PING ipv6.google.com(vx-in-x63.1e100.net) 56 data bytes From fe80::219:d1ff:fefb:42d8 icmp_seq=1 Destination unreachable: Address unreachable From fe80::219:d1ff:fefb:42d8 icmp_seq=2 Destination unreachable: Address unreachable From fe80::219:d1ff:fefb:42d8 icmp_seq=3 Destination unreachable: Address unreachable --- ipv6.google.com ping statistics --- 3 packets transmitted, 0 received, +3 errors, 100% packet loss, time 2014ms # tracepath6 ipv6.google.com 1?: [LOCALHOST] 0.025ms pmtu 1500 1: fe80::219:d1ff:fefb:42d8%eth0 2000.022ms !H Resume: pmtu 1500 # cat /etc/network/interfaces # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 64.***.***.*** netmask 255.255.255.248 gateway 64.***.***.*** iface eth0 inet6 static pre-up modprobe ipv6 address 2607:F878:1:***::1 netmask 64 gateway 2607:F878:1:***(same as address)::1 # ifconfig eth0 Link encap:Ethernet HWaddr 00:19:d1:fb:42:d8 inet addr:64.***.***.*** Bcast:64.***.***.*** Mask:255.255.255.248 inet6 addr: fe80::219:d1ff:fefb:42d8/64 Scope:Link inet6 addr: 2607:f878:1:***::1/64 Scope:Global UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:52451 errors:0 dropped:0 overruns:0 frame:0 TX packets:39729 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6817761 (6.8 MB) TX bytes:6153835 (6.1 MB) Interrupt:41 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:166 errors:0 dropped:0 overruns:0 frame:0 TX packets:166 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:31714 (31.7 KB) TX bytes:31714 (31.7 KB)

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• Codecs, Premiere Pro & Quicktime: Import or Play Error

  - by Nchpmn

  Original Question I've been using a FS-H200 (not the Pro variant) recorder with a JVC ProHD camera. I have been shooting with the DTE FORMAT to Quicktime (.mov). I copied the files to an external hard drive and am now trying to edit. The files will play back in VLC, as they would be expected to. However they will not import into Adobe Premiere CS5.5, instead giving an error: Unsupported format or damaged file. Quicktime gives the following error when attempting to play the files: Error -2002: a bad public movie atom was found in the movie (Filename) To try and fix this, I have installed the following codec packs: K-Lite Codec Pack 64-bit Full (version 5.9, latest) K-Lite Codec Pack 32-bit Full (version 8.4, latest) MainConcept Codec Suite (Broadcast) v5.1 for Adobe CS5 Reinstalled Quicktime with new download from Apple The same errors and problems still exist. From this I can assume that there is an issue with Quicktime and that is what Premiere is using as an encoder/decoder for the codec. Is there any way to fix this? From looking at the "Codec Information" from VLC: Stream 0 Type: Video Codec: MPEG-1/2 (mpgv) Language: English Resolution: 1280 x 720 Frame Rate: 25 Stream 1 Type: Audio Codec: PCM S16 BE (twos) Language: English Channels: Stereo Sample Rate: 48000 Hz Bits per sample: 16 Other computer specs: Windows 7 Professional 64-bit (SP1) Gigabyte Z68X-UD3-B3 Intel i7-2600K 16GB DDR3 2TB WD 7200RPM SATA 6Gb/s LaCie d2 Quadra 2TB v3 7200RPM (External HDD) NVIDIA GeForce GTX 560 Ti Golden Sample Updates 2012-03-11 @ 2050 AEDT MPEG Steamclip doesn't recognise, play or convert the footage. File open error: unrecognised file type. [Open Anyway] File open error: can't find video or audio tracks. 2012-03-24 @ 1920 AEDT Had to transcode the footage. :(

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• How to completely disable IPv6 for loopback interface on RHEL 5.6

  - by Marc D

  I've done lots of research on how to disable IPv6 on RedHat Linux and I have it almost completely disabled. However the loopback interface is still getting an inet6 loopback address (::1/128). I can't find where IPV6 is still enabled for loopback. To disable IPV6 I added the following settings to /etc/sysctl.conf: net.ipv6.conf.default.disable_ipv6=1 net.ipv6.conf.all.disable_ipv6=1 And also added the following line to /etc/sysconfig/network: NETWORKING_IPV6=no After rebooting, the inet6 address is gone from my physical interface (eth0), but is still there for lo: # ip addr show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:50:56:xx:xx:xx brd ff:ff:ff:ff:ff:ff inet 10.x.x.x/21 brd 10.x.x.x scope global eth0 If I manually remove the IPV6 address from loopback and then bounce the interface, it comes back: # ip addr del ::1/128 dev lo # ip addr show lo 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo # ip link set lo down # ip link set lo up # ip addr show lo 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever I believe IPV6 should be disabled at the kernel level as confirmed by sysctl: # sysctl net.ipv6.conf.lo.disable_ipv6 net.ipv6.conf.lo.disable_ipv6 = 1 Any ideas on what else would cause the loopback interface to get an IPV6 address?

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• Same native and tagged vlan possible on Redhat?

  - by Chris Phillips

  Hi guys and gals, I'm looking at implementing a systems using a number of tagged and a native vlan connected to a server over a a/p bonded interface. The untagged vlan is for physical machine access, the tagged vlans are connected to bridges and then to QEMU VM's inside the machine. Hopefully this plan is fine, but I'm trying to implement a crippled version of this in a dev environment due to a lack of underlying network config in this location where I just have the same single vlan delivered to the machine on a tag AND plain. I'm nto clear if this is going to work (and that I should just be confident that it will work using different vlans) as I'm seeing odd things like a vm is arping out over the vlan out to the core switch, but the arp reply is coming back on the untagged interface. Now an ARP reply is unicast right? So it's a deliberate thing to send the ARP response on the untagged interface, and not a case that a broadcast response isn't being passed on the tagged side... i.e. there's some underlying logic pushing it that way. Something about the MACs somehow? This is on a CentOS 5.5 machine, vlan's from vconfig. (I've seen reference to the Linux mac-vlan project work, but that's not available here by default.) so 1) Should having the SAME vlan tagged and untagged work? 2) Will different tagged vlans to the untagged interface work nice and easily?

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• How to set static ip address on vmware for NAT guest vms from an ubuntu Host dhcp server?

  - by javadba

  I need to configure various linux flavor NAT'ed guest vm's to have static ip addresses provided by the Ubuntu host. The vmware documentation punts on this topic, deferring to "see the man pages for your linux distribution". But the generic pages for "my linux distro" do not know about the special stuff for vmware e.g. vmnet8. Pointers from someone who just knows how to do this would be much appreciated. Here is the /etc/vmware/vmnet8/dhcpd/dhcpd.conf: allow unknown-clients; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours subnet 192.168.238.0 netmask 255.255.255.0 { range 192.168.238.128 192.168.238.254; option broadcast-address 192.168.238.255; option domain-name-servers 192.168.238.2; option domain-name localdomain; default-lease-time 1800; # default is 30 minutes max-lease-time 7200; # default is 2 hours option netbios-name-servers 192.168.238.2; option routers 192.168.238.2; } host vmnet8 { hardware ethernet 00:50:56:C0:00:08; fixed-address 192.168.238.1; option domain-name-servers 0.0.0.0; option domain-name ""; option routers 0.0.0.0; } Fromt the dhcpd.conf documentation, we are supposed to add an entry for static hosts similar to the following: host mystatichostonee { hardware ethernet 00:20:6B:C7:9B:E4; fixed-address 192.168.238.101; } host mystatichosttwo { hardware ethernet 00:23:7a:C7:9c:F2; fixed-address 192.168.238.102; } But notice that the vmnet8 entry in the vmware-generated dhcpd.conf already is set to fixed-address. I don't know how to add the specifics for my hosts to that vmnet8 entry: do they become nested?

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• Change source address based on destination IP

  - by hgj

  We have several "router" machines that gather a lot of external IP addresses on the same host and redirect, NAT or proxy the traffic to the internal network. They also act as routers for the machines on the internal network. This works fine, however I am unable to make the routing table, so I can change the source address, based on the destination a machine from the internal network want to access. Let's say I have a router, that has public addresses P1 (5.5.5.1/24) and P2 (5.5.5.2/24). All traffic goes through P1, but if necessary, the host is reachable on P2 too. This looks like this and works fine: > ip addr ... 1: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether aa:bb:cc:dd:ee:11 brd ff:ff:ff:ff:ff:ff inet 5.5.5.1/24 brd 5.5.5.255 scope global eth1 inet 5.5.5.2/24 brd 5.5.5.255 scope global secondary eth1:p2 ... Now I want to use P2 as the source address, if I want to access the Google DNS service for example (8.8.8.8). So I add a row in the routing table like: > ip route add 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 > ip route ... default via 5.5.5.254 dev eth1 5.5.5.0/24 dev eth1 proto kernel scope link src 5.5.5.1 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 ... But this does not work. If I ping 8.8.8.8, the host still uses P1 as the source address, and does not use P2 at all for outgoing connections. Am I doing it right? I guess not...

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• Send command through PuTTY automatic login

  - by Arthur

  I am using the following to login automatically to a remote server and then run commands listed in a commands.txt, like this: C:\path to\putty.exe -ssh adreese.ip -l user -pw Password -m C:\Path to\command.txt commands.txt contains the following: wakeonlan -i broadcast adress Macadress However, when I try to do so a new window for PuTTY appears, but it closes and exits instantly after login. As a result, I cannot see the output of the command(s). After a several tests, it appears that the command is not execute , cause my computer doesn't "wake on lan". I don't understand what's going on here ? I cannot use the plink.exe program cause I cannot make connection with public key ( too much distant site for doing all the registration keys in putty ) Can someone help me with this ? Or can i use another program to make ssh connection and send command with script from a windows os? Edit : I also try to make a bash file in the distant server with the same command and execute it from the session like this : C:\path to\putty.exe -ssh adreese.ip -l user -pw Password \home\user\script.sh Ihave the same problem... Need help please : /

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• How to kill ostensibly immortal process?

  - by DeeDee

  I had some huge file transfers operating on an NFS mount. The server on which the mount point resided was carelessly rebooted, and now the server from which these large transfers were initiated seems to be bogged down by them. If I run top, I see the following: The first thing I tried was to run kill with each the -1 -2 -9 and -15 flags, and each of the process ids shown above in turn. This allowed me to proceed, but didn't kill the processes. The next thing I attempted was to reboot the server, but neither reboot nor shutdown -r now worked. When I ran shutdown -r now the standard broadcast message was sent out, but the sever did not reboot. I confirmed this by looking at the server uptime, which was 25 days. So now I'm a little stuck. I'm running these commands as root. EDIT: Here's another interesting tidbit: In top, I don't see that any other processes are using more than a fraction of a percent of memory or more than 5% of CPU. EDIT 2: output of /var/log/messages

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