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• How do I keep a bridge enabled on a bonded interface?

  - by jlawer

  I'm working on setting up a pair of CentOS 6.3 servers that will run a couple of KVM vms and have come across a problem setting up a bridge on a bond. I am using Mode 4 (802.3ad) bonding on a pair of stacked Dell Powerconnect 5524 switches connecting to R320 servers. There are 2 links (1 to each switch) that form a Link Aggregation Group (802.3ad / LACP bonding). On top of the bond I have VLAN Tagging. I've verified this is a problem on multiple other bonding modes so it isn't just a mode 4 issue. I am testing what happens when 1 link is dropped (ie switch dies, cable breaks, etc). If I don't have a bridge (for KVM), everything works fine, failover happens as expected. If I have the bridge enabled, it works fine until failover (unplugging a cable). When failover happens /var/log/messages shows the slave link going down, followed within a second by: kernel: br1: port 1(bond0.8) entering disabled state The thing is /proc/net/bonding/bond0 shows the link is up as expected (simply with only 1 slave instead of 2). If I plug the cable back in it recovers and brings the bridge back to an enabled state. I actually have tested this while a ping is occuring and if the timing is right a packet will actually leave the system after the link is lost, but before the disabled message occurs. This disabled state I assumed was STP, but I have disabled STP on the bridge configuration and this issue still occurs. brctl showstp br1 still shows the link as disabled when it is running without a slave. I also switched between the nics in the server (I have 2x Broadcom & 4x intel). It doesn't matter which configuration I have. Does anyone know of a way to force the bridge to stay enabled or why its detecting the bond as disabled, when it isn't?

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• Create a wifi hotspot in a place where an authentication is required

  - by SoftTimur

  I live in a residence where Internet is provided via cable. Once the computer is connected to the cable, launching a browser will trigger an authentication, I have a username and password to enter, then the internet will be connected. With a gateway (e.g. Wireless Cable Voice Gateway Model CBVG834G) and 2 cables, two PCs can connect to the Internet with my account at the same time. Now the question is, I don't like the cable, and would like to create a wifi hotspot. It seems realizable with the same gateway. According to the instruction on page 2-4 of the manual: Enter http://192.168.0.1 in the address field of your Internet browser. Log in to the gateway with either of the default user names, MSO or admin... However, while connecting to the Internet successfully via cable and the gateway (e.g. google works), opening 192.168.0.1 oddly gives me an error on the browser: Does anyone know what happened? Is it due to the authentication required by my residence? Is there any other way to build a hotspot of wifi? PS: My system is MAC OS

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• Torrent upload ratio not updated on Synology DS212+

  - by user179271

  I have a Synology DS212+ NAS running DSM 4.2-3211 (current version). I use it for several purposes including torrent download using Download Station and a tracker that needs authentication. My problem is that my download/upload ratio isn't updated, so it constantly falls down. My NAS is behind a router, and I configured the NAT to forward ports 6890 to 6999 to the internal IP address of the NAS. Here are the Download Station settings : TCP port : 6990, Sharing ratio : 900%, Sharing time : infinite, max download speed : 0 (no limit), max upload speed : 0 (no limit), BT protocol encryption : checked, max numbers of peers allowed by torrent file : 4000, DHT : checked, with port 6889. When the DHT option is not checked, the NAS doesn't upload any files. I don't know what is this option for. Can someone help me to solve this problem ? Did I miss any step, or does it come from the NAT ? How is the authentication managed by Dowload Station ? (Sorry for my english) Thanks.

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• What to look for in a switch with LAN/WAN verses an iSCSI SAN?

  - by Luke

  I'm setting up a VMWare ESXi 5 environment with 3 server nodes. Dell recommended 2x Force10 S60 switches shared (iSCSI SAN, LAN/WAN). The S60 switches are extremely powerful. They have 1.25 GB of buffer cache, < 9us latency. But they are very expensive (online price ~$15k per switch, actual quote a little less). I've been told that "by the book" you should at least have 2 internal switches for SAN, and 2 switches for LAN/WAN (each with a redundant). I know some of the pros and cons of each approach. What I'm wondering is, would it be more cost effective to disjoin the SAN from LAN with less expensive switches? The answer to this question highlights what I should be looking for in a switch for the SAN. What should I be looking for in a LAN/WAN switch, in comparison to the SAN? With the above linked question for the SAN: How is buffer latency measured? When you see 36 MB of buffer cache, is that shared or per port? So 36 MB would be 768kb or 36MB per port? With 3 to 6 servers how much buffer cache do you really need? What else should I be looking at? Our application will be heavily using HTML5 websockets (high number of persistent connections). The amount of data being sent is small; Data sent between client <- server isn't broadcasted (not a chat/IM service). We will be doing some database reporting too (csv export, sums, some joins). We are a small business and on a budget. We'd probably only be able to spend no more than $20k on switches total (2 or 4).

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• How to securly join two networks together over the Internet?

  - by Pyrolistical

  Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you need a domain controller, or can you do this with workgroups? EDIT The obvious solution seems to be VPN, but can VPN be implemented on the routers only? Can the computers on the network be configuration free?

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• Transient network dropout for Xen DomU's

  - by Stephen C

  We've got a CentOS server running a cluster of virtuals. Occasionally the cluster's internal network drops out for a minute or so ... and then comes back. The problem is somehow related to the actual network traffic, but it is not a simple load issue. (The system is generally lightly loaded, and the problem occurs irrespective of actual load.) The setup: CentOS 5.6 on Dom0, various CentOS on the DomU's Hardware - a Dell R710 with a BroadCom NextXpress 2 NIC (sigh) using the latest drivers for the NIC from BroadCom Xen configured to use network-bridge and vif-bridge Some iptable tweaks to route an unrelated port to one of the virtuals. The system has one externally visible IP address, and Dom0 runs an Apache httpd configured with a number of virtual hosts each of which reverse proxies to web servers running on the virtuals. (The virtuals have to be NAT'ed, primarily because we don't have enough allocated public IP addresses.) The symptoms: Works fine most of the time. When someone tries to UPLOAD a large file to one virtuals, the internal network drops out ... for all virtuals: The Dom0 httpd sees a network timeout talking to the backend server on the virtual and reports a 502. A previously established ssh connection from Dom0 to any of the DomU's freezes. Our monitoring shows ping failures for traffic between virtuals. The Xen consoles to the DomU's do not freeze. No log messages in any log files that I can see, on either Dom0 or the DomU's ... apart from the Dom0 httpd logs. After a minute or so, the problem clears by itself. This is 100% reproducible. What we've tried: Downloading, building and installing the latest BNX2 driver on Dom0 Turning off MSI on the NIC - adding "options bnx2 disable_msi=1" to /etc/modprobe.conf Turning off tcp segmentation offload - "ethtool -K eth0 tso off". Sacrificing a black rooster at midnight. I've exhausted all my options apart from switching to KVM ... or slaughtering more roosters. Any suggestions?

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• My windows xp wireless hotspot isn't working

  - by Dominic Grenier

  I add the hotspot the regular way. Yet it doesn't show up as available when I try to connect to it using my other Ubuntu laptop. And nothing can connect to it. Yesterday, I successfully made it work for 5 minutes and then it stopped without me changing any configuration. I've already tryed resetting the DNS. Edit: I've updated my Broadcom 802.11b/g driver to a generic but more recent version. I've also repaired the WMI, now the advanced tab of my primary connection is available and the hand meaning the connection is shared appeared. But the computers still connect the wrong way around. (Windows to ubuntu instead of ubuntu to windows) Reinstalled SP3...

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• IP queue buffer

  - by summerbulb

  I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, and managing their network traffic. All incoming packages are captured, using iptables, and analyzed by a C application. The application analyzing the packets has a built-in delay, as part of the experiment. So I have one very fast computer sending packets through my linux-router and a (relatively) slow linux-router that analyses and deals with the packets, one by one. This situation leads to the fact that when I fire up a sender application on one of the computers connected to the linux-router, my IP queue on the linux-router gets filled up (almost) instantaneously. The IP queue's max length is currently set to 1024, and if it overflows, the packets are dropped. This is expected and i'm OK with it. But, (and this is where it gets interesting), every now and then I get the following error: "Failed to receive netlink message: No buffer space available" At start, I thought this was due to the IP queue overflow, but after some analysis i found that sometimes I get the error even if the IP queue buffer did not overflow, and sometime I DON'T get the message even though the buffer DID overflow. When I run > cat /proc/net/ip_queue, I get the following table (also used to monitor the IP queue overflow): Peer PID : 27389 Copy mode : 2 Copy range : 65535 Queue length : 0 Queue max. length : 1024 Queue dropped : 1166875 Netlink dropped : 2916 Looking at the last two values, Queue dropped seems to refer to packets that did not manage to get into the IP queue because the buffer was full. I can see this value rise as I bombard the linux-router. Netlink dropped ( as it's name implies :) ) seems to have to do with the error i'm getting. I did my best to search for material on this error, but wasn't able to find anything that seemed to point me in the required direction. Bottom line: Why am I getting this error and what can I do to avoid it?

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• Linux servers seeing bad download performance behind Sonicwall firewall

  - by Joshua Penix

  I'm working with a pair of co-located CentOS Linux servers sitting behind a Sonicwall PRO 2040 Enhanced firewall running in transparent bridge mode. These servers are having a strange problem downloading files more than a few megabytes in size. For example, if I try to wget or FTP a copy of the Linux kernel from kernel.org, the first ~1-2MB will download at 600+K/s, and then throughput will drop off a cliff to 1K/s. I've reviewed all the firewall configuration settings for anything suspicious, but found nothing. More interestingly, I performed the same download with a Windows server sitting behind the same firewall, and it sailed right through at 600+K/s the whole way. Has anyone seen this? Where should I start looking to troubleshoot this problem?

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• D-LINK DIR-615 router keeps giving my wireless devices bad ip addresses

  - by mlsteeves

  I have a D-LINK DIR-615 router, and wired devices have no problem getting an IP, however; wireless devices end up with a 169.254.. address (subsequently, they cannot access the internet through the router). I have removed all wired connections from the router, so there is no other dhcp server running. I've also gone back to the store, and replaced it with another, thinking that maybe it was defective. According to the router, it gave 192.168.0.101 to the wireless device. According to the wireless device it got 169.254.67.71. I've tried both a laptop and an iPod Touch, both exhibit the same behaviour. Has anyone seen this type of behaviour, or have any ideas of stuff to try? NEW INFORMATION I looked at the logs on the router, and when the wireless device tries to connect, this is what is logged: Sep 10 18:13:39 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:31 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:26 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:23 UDHCPD sending OFFER of 192.168.0.111 Sep 10 18:13:21 UDHCPD sending OFFER of 192.168.0.111 I connected a computer directly to the router, and here is what it looks like: Sep 10 18:14:18 UDHCPD Inform: add_lease 192.168.0.110 Sep 10 18:14:14 UDHCPD sending ACK to 192.168.0.110 Sep 10 18:14:14 UDHCPD sending OFFER of 192.168.0.110 Not sure if that helps or not.

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• Music Streaming Devices

  - by Skizz

  I'm looking for peoples opinion on wireless music streaming devices - something like this. I have an iTunes library hosted on an ubuntu server and I'm looking for something to allow me to listen to all the albums stored on it. Ideally, it should provide a good quality playback both over headphones and through speakers so that everyone can hear it. It doesn't need to be ultra-portable - being able to move the system and plug in a mains lead should be enough, so a single, integrated unit is preferable. One product per answer please and if you've used a product, vote it up or down depending on whether it's any good or not. Use comments to highlight good/bad points.

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• Very High Network out in ec2 instance

  - by Jatin

  I launched an ubuntu-14.04-64bit instance in Amazon EC2 two days back. And I started Tomcat 7.0.54 in that instance and deployed my application war files. It has no other software installed other than tomcat and the default ones. In the past 2 days, its shows 858 GB of Data Transfer(Network Out) from that instance. I have attached a graph of Amazon CloudWatch Metric "Network Out" My application does not do any data download/upload. Its a Java Spring application and the front end is in HTML&Javascript. My application traffic was very low (less than 20 hits) in those 2 days. Is there a way to find out why these data transfers happened and also to find what data has been transferred. If you can see in graph, network out was 20gb per minute. Some more info: Network in was negligible CPU Utilization was very high Everything else was low

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• How to prevent wifi router from broadcasting multiple ssids?

  - by user1092288

  I have the following Wi-Fi router: http://www.beetel.in/business-solutions/international-business/adsl/450-four-port-wifi-modem And I am also posting screen shots of ISP settings (from 192.168.1.1). Problem is, my Wi-Fi router is broadcasting multiple SSIDs (even the SSIDs which I used in the past and aren't entered in settings at present). How do I resolve this to broadcast single SSID? I have already tried factory settings restore. SSID1 Settings SSID2 Settings SSID2 Settings- greyed-out, unable to change anything

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• How to force Windows 7 to ask for a "fresh" IP address from DHCP server?

  - by haimg

  I'm troubleshooting a certain issue with my DHCP configuration, and need my Windows machine to ask for a "fresh" IP address, so I can see which address DHCP server gives by default. When I do ipconfig /release followed by ipconfig /renew, Windows "proposes" its old IP address to the DHCP server (just checked with Wireshark, initial "DHCP Discover" message has Option-50 (requested IP address) with Windows machine's old IP). Tried disabling/enabling network adapter. Same behavior. Question: How can I force Windows to just ask for a new IP address, without proposing its old IP address.

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• Why does my Intel Tolapai network chip not transmit packets?

  - by Hanno Fietz

  I'm trying to deploy an embedded system (NISE 110 by Nexcom) based on the Intel EP80579 (Tolapai) chip. Tolapai apparently integrates controllers for Ethernet etc. on a single chip (Intel homepage). The machine can't get a network connection. Diagnosis as far as I could manage: Drivers drivers from Intel compiled and installed without problems (version 1.0.3-144). Kernel version and Linux distribution (CentOS 5.2, 2.6.18) match the driver's installation instructions. drivers are loaded and show up in lsmod (module names are gcu and iegbe) interfaces eth0 and eth1 show up in ifconfig ifconfig I can bring up the interfaces with fixed IP pinging the interface locally works ifconfig shows flag UP but not RUNNING Link ethtool shows "Link detected: no", "Speed: unknown (65536)" and "Duplex: unknown (255)" Link LED is on on the other side of the cable, ethtool shows "Link detected: yes" and reports a speed of 1000 Mbps, which has allegedly been auto-neogotiated with the problematic device. Network traffic analysis the device does not reply on ARP, ICMP echo or anything else (iptables is down) when trying to send ICMP or DHCP requests, they never reach the other end activity LED is off on the device, on at the other end. I tried the following without any effect: Different cables (2 straight, one crossed), I get the link LED lit up on each. Three different devices on the other end (one PC, one netbook, one router) Fixed ARP table entries on both sides Connecting both network ports of the machine with each other, won't ping through the cable, but will ping locally. Tried straight and crossed cables for that.

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• How do I replicate Gmail filtering (forwarding mostly)?

  - by projectdp

  I have reached the limits of Gmail forwarding. Before there was no need to verify forwarding addresses. It's a problem for me now because the addresses I want to forward to are not natural inboxes but automated systems with no way to track the verification email contents. I want to set this up for example: mobile - email - facebook-email - flickr-email - tumblr-email - posterous-email How do I do this without Gmail filters? I think I need to use fetchmail to watch my inbox and then autoforward to the above addresses. Is fetchmail the best solution to this issue? Any other MRA's? I'd like to do some more complicated things with the emails in an automated fashion too, how would I go about monitoring the inbox, doing some actions to the email before forwarding, and forward everywhere? prerequisites: a server: fetchmail daemon to poll the account local mailbox script to clean & forward appropriately (python probably) sendmail + ~/.forward file backup email account (Gmail probably) Any help would be greatly appreciated. I'm trying to automate my social content distribution.

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• Configuring network route between two routers on home network

  - by Paul

  I have a home network - the main router connected to the internet (and has wifi) is a Netopia box. Connected to it is a Linksys router. Everything currently works - I can connect via the wireless network and get to the internet. Machines connected to the Linksys can connect with each other and connect to the internet. Both routers are configured to serve addresses via DHCP (Netopia 192.168.1.1 - 192.168.1.99), Linksys (192.168.0.1 - 192.168.0.100). Here's how they are connected: Internet <-> Netopia w/wifi (192.168.1.254) <-> Linksys (192.168.0.1) I decided I really need to allow wireless connections to also communicate with machines behind the Linksys router. Currently the Linksys is configured to obtain an IP address via DHCP. I thought this would be straightforward. I configured the Linksys to have a static IP address: IP: 192.168.1.100 Mask: 255.255.255.0 GW: 192.168.1.254 Then I configured a static route on the Netopia: Network: 192.168.0.0 Mask: 255.255.255.0 GW: 192.168.1.100 So it should now look like this: Internet <-> Netopia w/wifi (192.168.1.254) <-> (192.168.1.100) Linksys (192.168.0.1) I reset both routers. I cannot ping the Netopia (192.168.1.254) from inside the Linksys network, and if I attempt to ping 192.168.0.1 from a wifi connection I get a "Destination host not available" error. Obviously I'm missing something, but I'm not sure where. Any ideas on what I'm missing?

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• Netgear router keeps disconnecting iPhone

  - by DisgruntledGoat

  My old router (Voyager 2091) packed up so I just got a new router - a Netgear N150 model DGN1000. My laptop connects OK wirelessly, but my iPhone 4S is constantly getting "disconnected" - it has perfect wifi signal and is seemingly connected to the router, but no pages load (it says "server cannot be found"). If I disconnect manually ("forget this network") then reconnect, it works fine again for a random amount of time (usually 10-30 minutes) then I get the same problem again. I've done some searching and this appears to be a known problem - there are dozens of forum posts out there lamenting similar connection problems. The only advice I have seen is to set a specific channel under Wireless Settings on the router CP, although every forum post recommends a different channel! 1, 3, 5, 6, 11... I have tried them all for hours at a time and get the exact same problem. The firmware is up to date. Is there an actual solution for this, or do I need to get a different router just to be able to use my iPhone?

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• Copying between 2 network devices

  - by Dave Rook

  My network has 3 devices - 1 PC and 2 other network devices (which could be PC, NAS, external hard drive etc) If I want to copy data from one network device to another network device from my PC (using the copy and paste method (i.e right click a file, select copy and then right click into the destination folder and click paste) and therefore not using any tools that could be built into the network devices for such a transaction), does the data get routed via my PC or use my systems resources?

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• Barriers to IPv6 deployment: addressing

  - by sysadmin1138

  There are several things that are keeping IPv6 deployment from being a topic of active discussion here at my work. There are the usual technical issues, but one non-technical one appears to be a major stumbling block on the path to actually getting a deployment project going. Addresses, memorizing of. Specifically, IPv4 addresses are comprehensible, and IPv6 addresses just look like a big long string of hex. The human mind has real trouble memorizing lists of more than 7-8 items, and an IPv4 address (192.168.231.148) has four items in it which makes it easy for us to memorize. A fully populated IPv6 address has not only 8 sections, but each section has 4 hex digits in it. IPv6 addresses were not designed for memorization. To the technician who knows that the DNS server is at 192.168.42.42 (or more likely "42.42", since the company prefix is likely memorized), the idea of memorizing an IPv6 address fills them with dread. Which in turn makes them much less enthusiastic about participating in an IPv6 deployment project. Because of how our network works we're not fully dynamic in terms of v4 addressing. We have several to many subnets that are entirely statically assigned for a variety of reasons, chief among them being that the overhead of static DHCP assignments is perceived as being too great. Also, some devices still aren't smart enough to pull DNS addresses out of DHCP while also having a static assignment, and therefore require manually configured DNS settings. Therefore, some v6 address memorization will have to be done. We're not under any mandate to get v6 out the door, so we don't have pressure from the top. However, it is time to start prepping our infrastructure to handle IPv6 even if we don't convert wholesale. For those of you who have been in IPv6-land for a while, what short-cut methods do you use to discuss or keep track of subnets and specific/critical IP addresses? If I can help reduce some of the dread surrounding IPv6 we might get the project going.

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• Kickstart: ifcfg-eth0 file genorated by kickstart when install from network but from initrd when install form USB

  - by dooffas

  When I install Fedora 19 with a kickstart file and via network, the generated ifcfg-eth0 file is genorated by the kickstart: # Generated by parse-kickstart However if I use the same kickstart file and install via a USB stick, the ifcfg file is generated by initrd. # Generated by dracut initrd The line in the kickstart file to set the network settings is as follows: network --device=eth0 --bootproto=dhcp --hostname=SOMEHOSTNAME Is there away to keep network device settings set in the kickstart file when not installing via network?

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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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• Traceroute to IP address fails, but traceroute to domain name with same IP address is okay. Why?

  - by tomo

  When I traceroute to this IP (108.162.198.181) it stops after 1 hop. But tracerouting to a domain (www.gomodule.com) with the same IP shows 9 hops ending in that target. traceroute to www.gomodule.com (108.162.198.81), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 131.667 ms 48.532 ms 48.837 ms 2 118.69.255.124 (118.69.255.124) 91.521 ms 79.177 ms 30.679 ms 3 42.117.11.225 (42.117.11.225) 30.270 ms 32.091 ms 29.698 ms 4 118.69.253.213 (118.69.253.213) 32.234 ms 118.69.253.237 (118.69.253.237) 70.667 ms 118.69.253.213 (118.69.253.213) 82.440 ms 5 118.69.253.245 (118.69.253.245) 64.554 ms 80.277 ms 130.224 ms 6 118.69.251.205 (118.69.251.205) 65.635 ms 118.69.249.78 (118.69.249.78) 133.234 ms 118.69.251.205 (118.69.251.205) 224.111 ms 7 118.69.251.249 (118.69.251.249) 156.679 ms 111.965 ms 64.165 ms 8 cloudflare1-rge.hkix.net (202.40.160.246) 64.102 ms 64.498 ms 74.581 ms 9 108.162.198.81 (108.162.198.81) 66.873 ms 67.426 ms 69.054 ms -vs- traceroute to 108.162.198.181 (108.162.198.181), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 96.588 ms 3.003 ms 4.976 ms 2 118.69.255.124 (118.69.255.124) 45.223 ms 31.449 ms 31.225 ms 3 * * * 4 * * * 5 * * * 6 * * * 7 * * * 8 * * * 9 * * * 10 * * * ...

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• Connected to internet but can't browse after trying to remove Covenant Eyes

  - by Joanna

  I recently got a MacBook Pro. It connects to ethernet\wifi and has internet but when I open Safari or Firefox, nothing happens. I get a timeout for all websites. I had Covenant Eyes on my Mac before and tried to remove it. My friends who work with computers have tried everything (ping, nslookup etc). Network diagnostics show no problems I can see I'm connected through ifconfig because I get an IP. I also get a response pinging www.google.gr. There are no proxies set in my Network preferences. Any ideas?

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• How is DNS used by individual processes?

  - by atroon

  When resolving FQDNs or machine names to IP addresses on my local network (mycompany.internal) I can use dig on the command line (linux/mac) or nslookup (windows) to query the configured server and get a response. But trying to enter the FQDN or even just the machine name in a ping command or in a web browser results in 'Unknown Host' or DNS errors. Here's a sample, this one from the Mac: mac:~ atroon$ dig server.mycompany.internal ; <<>> DiG 9.6.0-APPLE-P2 <<>> server.mycompany.internal ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5219 ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;server.mycompany.internal. IN A ;; ANSWER SECTION: server.mycompany.internal. 1200 IN A 172.16.254.36 ;; Query time: 0 msec ;; SERVER: 172.16.254.8#53(172.16.254.8) ;; WHEN: Wed Dec 16 11:39:15 2009 ;; MSG SIZE rcvd: 55 mac:~ atroon$ ping server.mycompany.internal<br> ping: cannot resolve server.mycompany.internal: Unknown host I cannot for the life of me figure this one out. The DNS server is a SBS 2003 box which handles AD, some file/print, etc for a small company network. This issue happens to me about three times a week, and when I'm connected to the local network directly, the same switch as the server even. I can make any connection I want with IP addresses, I just can't make DNS work. Additionally, at the same time I'm experiencing this, other users are fine, which makes me think it's a problem on my Mac. But what sort of problem? How can dig send a query and get a reply, and ping say 'unknown host'? I'm posting here vs. serverfault because I think this is a local problem not a server problem...but if anyone can point me at the server, I guess we'll head down the street a domain or two.

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