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• Leopard Network Shares and browsing are unreliable

  - by EvilChookie

  I have two macs, running Leopard 10.5.8. One is the 13" MBP connected via WiFi, and the other is a 24" 2008 iMac, connected via ethernet. There are at least another 6-10 machines (windows and mac) awake on the network (with shares) at any given time, yet there are plenty of times where I cannot see any devices/shares in either my "Shared" section in Finder, nor can I see any computers in "Network" in Finder. Restarting doesn't help. I've restarted all the networking gear in the house to no avail. Our network is a series of gigabit switches connected to a D-Link gaming router. I believe we use OpenDNS, and our provider is Cox. I hate having to use "Go - Connect to Server" to browse to commonly used file shares (by IP). I'd like to know why my shares do not always and consistently appear in Leopard. Edit: I ran OnyX this morning, and performed the cleaning and maintenance operations (including disk permissions) on both my Macs, and at least one of my macs has started showing network devices again. (the other is still going). No idea how long this will last. Any ideas as to what is causing this issue, and how to prevent it? Edit 2: Aaaand there the shares go again. So running OnyX is not a permanent or reliable fix for this issue. Edit 3: After a clean reinstall and update, network shares are still unreliable. The SMBClient command mentioned in comments shows me the information it's supposed to show, but the shares do not appear in the shared section. They'll also vanish at random and reappear at random throughout the day.

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• monitoring a /21 for potential bad guys with snort and port mirroring

  - by Adeodatus

  Hi all, I want/need to start monitoring our network a bit better. Its an odd network in that it comprises 2 /22 public IPs and a slew of private admin IPs. I do have one point in the network where it all comes together and I can turn on port mirroring on the catalyst. From that port, I'd like to turn up a box running various utilities. Snort is high on my list but it'd be nice to also get some networking statistics with something like Netflow. So, what are peoeple's thoughts. I can turn up a box needed for this with a bit of ease. We have the hardware available. What should I run? I'd love to know what kind of nasty things are potentially going on but I'd also like to see statistics on what people are doing on the network so I can better tweak our systems to handle it better and improve performance. I'm open so please, give me some ideas to go along with what I've got.

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• client flips between internal and external IP addresses??

  - by jmiller-miramontes

  I have what seems like a not-particularly-complicated home network, all things considered: a DSL line comes in to a modem/router, which goes off to a switch, which supports a bunch of machines. My machines live in a 192.168.0.x address space; however, I'm running some public servers on the network, so I have a block of 8 (5, really) static IP addresses that are mapped to the servers by the router. The non-servers get 192.168.0.x addresses via NAT; some machines have static addresses and some get addresses from DHCP. Locally, I'm running a DNS server (named) to map between the domain names and the 192.168 address space. Somewhat messy, but everything basically works. Except: One of my local non-server clients occasionally switches from its internal address to its external address. That is, if I check the logs of a website I'm running internally, the hits coming from this client sometimes show up with the internal 192.168 address, and sometimes with the external (216.103...) address. It will flip back and forth for no apparent reason, without my doing anything. This can be a problem in terms of how the clients interact with the way I have some of the clients' SSH systems configured (e.g., allowing access from the internal network but not the external network), but it also Just Seems Wrong. I will confess that I'm kinda skating on the very edge of my networking competence here, but I can't for the life of me figure out what's going on. If it helps, the client in question is running Mac OS X / 10.6; its address is statically assigned, is not one of the five externally-accessible addresses, and gets its DNS from (first) the internal DNS server and (second) my ISP's DNS servers. I can't swear that none of the other NAT clients are also showing this problem; the one I'm dealing with is my everyday machine, so this is where I run into it. Does anybody out there have any advice? This is driving me crazy...

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• Ping: sendmsg: operation not permitted error after installing iptables on Arch GNU/Linux

  - by estol

  Yesterday I got a new computer as my homeserver, a HP Proliant Microserver. Installed Arch Linux on it, with kernel version 3.2.12. After installing iptables (1.4.12.2 - the current version afaik) and changing the net.ipv4.ip_forward key to 1, and enabling forwarding in the iptables configuration file (and rebooting), the system cannot use any of its network itnerfaces. Ping fails with Ping: sendmsg: operation not permitted If I remove iptables completely, networking is okay, but I need to share the Internet connection to the local network. eth0 - wan NIC integrated on the motherboard (no idea of vendor, probably HP). eth1 - lan NIC in a pci-express slot (Intel Gigabit CT Desktop http://www.intel.com/content/www/us/en/network-adapters/gigabit-network-adapters/gigabit-ct-desktop-adapter.html) Since it works without iptables(server can access the internet, and I can login with ssh from the internal network), I assume it has something to do with iptables. I do not have much experience with iptables, so I used these as reference (separate from each other of course...): wiki.archlinux.org/index.php/Simple_stateful_firewall#Setting_up_a_NAT_gateway revsys.com/writings/quicktips/nat.html howtoforge.com/nat_iptables On my previous server, I used the revsys guide to set up nat, worked like a charm. Anyone experienced anything like this before? What am I doing wrong? Thanks, estol

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• Wifi network undetectable on a Lenovo G470

  - by Rex

  I have a WPA2 secured network with a visible SSID at home that works perfectly fine with a Dell laptop,a HP netbook and sundry mobile phones. When I try connecting my sister's Lenovo G470, it refuses to detect the wifi network no matter what, but shows up the neighbors' networks. The Lenovo also works correctly at her office. Both laptops run Windows 7. Already tried/checked the following: Manually configure wifi network settings (copied over from the Dell) Ensure there is no MAC address filtering on the router. Ensure router DHCP server is not running out of addresses to assign (I have set it to allocate upto 10). Reboot laptop, router etc. Is this a known problem, and is there anything else one could try? Update - The problematic Lenovo uses Windows 7 Home Basic while the Dell that works uses Home Premium and the HP netbook uses Starter edition - if that makes any difference. Further update - It is able to connect if I reboot into safe mode with networking. However in 'normal' mode it shows up the network sporadically, and then says there was an error connecting to it. All the network parameters, password, encryption, etc etc are EXACTLY the same as they are on the Dell.

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• Failed to bring up eth1 in a dual ips solution in ubuntu

  - by lxyu

  I'm using ubuntu 12.04. I tried to assign two ips to two ethernet cards in my server. The content of /etc/network/interfaces is like this: auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 114.80.156.a netmask 255.255.255.224 gateway 114.80.156.b auto eth1 iface eth1 inet static address 114.80.156.c netmask 255.255.255.240 gateway 114.80.156.d a b c d have different values, which means the two ips are in different vlans. But I can only bring up eth0 with this command: $ /etc/init.d/networking restart RTNETLINK answers: File exists Failed to bring up eth1. ...done. I have checked the question here which shows the same problem like the one I encountered: Can only bring up one of two interfaces But it seems it's not really solved. And in my situation, I need the 2 ips to use 2 different gateways. So how to fix this problem? Edit1, changed the example config ip from 192.168.0.0/16 subnet to another 'real' subnet. Edit2, the purpose of doing this is fairly simple. Because the ip range I previous in don't have more room for new servers, and I have to move to another ip range. So I want to make the public servers bind to 2 ips for the transition period. I only have really limited knowledge about routing and subnet. @BillThor @rackandboneman, would you please give me some keywords or links on how to setup route for 2 ips? and @Mike Pennington, how do you know I speak chinese?

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• Can I attach a VPN firewall to an existing network and have it manage VPN connections?

  - by jules

  I'm quite new to networking and am trying to set up my first VPN connection. The Situation: I have been contracted for some programming at a facility some distance from my location. I would like to be able to set up a simple VPN connection to their network so that I may make adjustments without significant travel. Their Current Network: Six devices (one I need to connect to) plugged into a basic router (Dlink). This router has an internet connection and a static ip address. My Hopeful (questionable) Proposal: I attach a VPN Firewall I happen to own (Netgear FVS318) as device number seven on the client network. I disable routing / DHCP in the Netgear. I forward the appropriate IPSec ports from the Dlink to the Netgear. I then create a VPN connection on my office Windows 7 machine to the remote network. The request is forwarded from the Dlink to the Netgear where the VPN connection is authenticated. I now have a remote-access connection from my office PC to the client's local network. The Question: Will this proposal work? If not, would another possibility be to attach a computer with a VPN server to the client network? Also, as a note: the client has requested I not replace their router or place mine in-between theirs and the internet :( Thanks very much!

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• Can I run a mix of static addressing and NAT?

  - by aroth

  Let's say that an ISP offers a plan with 5 static IP addresses, but I have more than 5 devices, many of which (such as a networked printer, for instance) I do not want or need to have a static IP address. So the topography I'm planning goes something like: ISP -> Router -> Switch -> Computer (static address) -> Computer (static address) -> Printer (DHCP/NAT) -> Tv (DHCP/NAT) -> (...) -> Wireless Devices (DHCP/NAT) Generally speaking, is it possible to run a network like that? If not, then what sort of setup do I need so that I can assign static addresses just to the things that need them, and use DHCP/NAT for everything else? Also, what internal networking devices will consume a static IP address? I'm pretty sure the router will, correct? Does the switch also?

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• Can't Connect To Local Mysql Using IP Address, but CAN connect from remote server

  - by user1782041

  Here's an interesting one that does not seem to fall into any of the mysql connection issues I've read about or searched for: On an Ubuntu 12.04 box I had some system updates waiting to install, and I took care of that this evening. After the install, I started seeing some errors in my syslog complaining about a particular php script that could no longer connect to the mysql instance on the box. Here is the specific error: PHP Warning: mysql_connect(): Can't connect to MySQL server on '192.168.0.40' (4) Now, the server's IP address is 192.168.0.40, and I've checked to make sure that I have mysql listening on 0.0.0.0 so that I can connect using either "localhost" or "192.168.0.40". Here's where things get odd: From the local machine, if I try the following: mysql -uroot -p -h192.168.0.40 I get this error: ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.0.40' (110) I've checked, and error 110 indicates an OS timeout, and error 2003 is the mysql generic "can't connect" error. This indicates that it is not permissions with the user. However, if I do the same thing from a remote machine (say, from 192.168.0.30), I log right in with no problems. Futher, other scripts on the local machine that connect to mysql using "localhost" for the host rather than "192.168.0.40" connect with no problems. Also, I can connect via the mysql socket with no problems both from the command line and php scripts. So, this feels like a networking issue of some kind on the local box, but there are no iptables rules on this box (it is firewalled externally) and I can't figure out what else may be causing this. This problematic script worked perfectly prior to the latest system update. For now, I'll simply change the script to connect via localhost, but I'd really like to know why it broke for 2 reasons: There may be other scripts that connect using 192.168.0.40 that don't run very often which are now broken. Auditing them all will take more time than I feel like devoting at the moment. I'm curious, and want to know why it broke so I can fix it correctly. Any help?

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• Routing WIFI and LAN for specific traffic

  - by jakebird451

  I have two network devices aboard my macbook pro: WIFI (en1): Used for general traffic. Connects to an ip of 192.168.19.* via DHCP LAN (en0): Used for specific traffic. Connects to an ip of 192.168.2.10 as a static IP. Does not connect to a router, only a switch for direct routing connection. I have 4 IP addresses I need to access on the LAN: 192.168.2.1 192.168.2.21 192.168.2.20 192.168.2.30 The rest of the traffic needs to go to WIFI. I have tried setting up a routing table for the specific ip addresses, but I only managed to mess up my network. I do not venture out into the world of networking too often, but this was the latest command I have been trying: sudo route add -host 192.168.2.30 -interface en0 This command killed my ability to use ping. It told me that ping could not allocate memory (is that even possible)? It also killed my wifi access. Logging out and back in fixed the issue. I really do not mind to make this solution permanent, so I am fine with a temporary routing. EDIT: If I currently have been trying: sudo route flush sudo route add default 192.168.19.1 This gets everything to work for about a minute. But after such minute it "forgets" the routing to WiFi while retaining LAN's (en0) routing. If I unplug and replug my LAN (en0) cable, the process works for another minute.

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• Secondary IP (eth0:0) acts like main server IP

  - by George Tasioulis

  I have a CentOS server, configured with 4 consecutive IPs: eth0 5.x.x.251 eth0:0 5.x.x.252 eth0:1 5.x.x.253 eth0:2 5.x.x.254 The problem is that all traffic goes out to the internet with eth0:0 (5.x.x.252) as the source IP, instead of eth0. # curl ifconfig.me 5.x.x.252 How can I fix this, so that all traffic goes out via eth0, ie my main IP? PS: My server is VPS running on a Xen dom0, the latter being configured in routed mode networking. Thanks in advance! Server configuration # ifconfig eth0 Link encap:Ethernet HWaddr 00:x:x:x:x:AE inet addr:5.x.x.251 Bcast:5.x.x.255 Mask:255.255.255.255 inet6 addr: fe80::x:x:x:x/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14675569 errors:0 dropped:0 overruns:0 frame:0 TX packets:9463227 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:4122016502 (3.8 GiB) TX bytes:25959110751 (24.1 GiB) Interrupt:23 eth0:0 Link encap:Ethernet HWaddr 00:x:x:x:x:AE inet addr:5.x.x.252 Bcast:5.x.x.255 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:23 eth0:1 Link encap:Ethernet HWaddr 00:x:x:x:x:AE inet addr:5.x.x.253 Bcast:5.x.x.255 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:23 eth0:2 Link encap:Ethernet HWaddr 00:x:x:x:x:AE inet addr:5.x.x.254 Bcast:5.x.x.255 Mask:255.255.255.224 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:23 # cat /etc/hosts 127.0.0.1 localhost.localdomain localhost 5.x.x.251 [fqdn] [hostname] # cat ifcfg-eth0 DEVICE=eth0 BOOTPROTO=static ONBOOT=yes IPADDR=5.x.x.251 NETMASK=255.255.255.224 SCOPE="peer 5.x.y.82" # cat ifcfg-eth0:0 DEVICE=eth0:0 BOOTPROTO=static ONBOOT=yes IPADDR=5.x.x.252 NETMASK=255.255.255.224 # cat route-eth0 ADDRESS0=0.0.0.0 NETMASK0=0.0.0.0 GATEWAY0=5.x.y.82 # netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 5.x.y.82 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 5.x.x.224 0.0.0.0 255.255.255.224 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 5.x.y.82 0.0.0.0 UG 0 0 0 eth0

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• Connecting to server from remote machine

  - by Jannat Arora

  I wish to connect my machine to a server in some other city. For doing the same I am using the following command: mstsc -v ip_address_of_server remote desktop can't connect to remote computer for one of these reasons: 1) Remote access to server is not enabled. 2) Remote computer is turned off 3) Remote computer is not available on network. Make sure remote computer is turned on and connected to the network, and that remote access is enabled. As per previous posts I need to turn off my client computers firewall..which I have...but still it gives me the same message. Can someone please please help me out...so as to how i may resolve this?? I am really new to networking, etc. Also when i am pinging: ping ip_address_of server I am getting the following response: Reply from ip_address_of_server: destination host unreachable Also I did try on ubuntu with rdesktop...still its not been able to connect with it. Also i know there are other people who are able to connect their machines with the server remotely. So i guess its not working for me only. Also when I accessed the same machine through LAN I was able to do so.

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• Windows 7 - Windows XP - sharing - why isn't working?

  - by durumdara

  Hi! This is seems to be "hardware" and not "software" / "programming" question, but I need to use this share in my programs, so it is "close to programming". We had an XP based wireless network. The server is XP Professional, the clients are XP Home (Notebooks). This was working well with folder sharing (with user rights, not simple share). Then we replaced the one of the notebook with Win7/X64 notebook. First time this can reach the server, and the another client too. Later I went to another sites, and connect to another servers, another networks. And then, when I return to this network, I saw that I cannot connect to this server. Nothing of resources I see, and when try to dbl click on this computer, I got login window, where I can write anything, never I can login... The interesting part, that: Another XP home can see the server, can login as quest, or with other user. The server can see the XP home notebook. The Win7 can see the notebook's shared folders, and XP home can see the Win7 shared folders. The server can see the Win7 folders, BUT: the Win7 cannot see the server folders. Cannot see the resources too... The Win7 is in "work networking group", the group name is not mshome. I tried everything on the server, I tried to remove MS client, restore it with simple sharing, set guest password, etc., but I lost the possibilities to access this server from Win7. Does anyone have any idea what I need to see, what I need to set to access these resource - to use them in my programs? Thanks for every info, link: dd

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• Setting up Windows SBS 2008 network on Xen

  - by samyboy

  I'm trying to install a Windows SBS 2008 server in a Xen environment. The OS is booting fine. Unfortunately I can't figure out how to set up the network settings. Dom0 is a Debian Lenny hosting around 10 virtual servers. Here are the settings I'm using in the hosted Windows SBS: IP address: 10.20.0.8 Network mask: 255.255.0.0 Gateway: 10.20.0.1 Note that during the installation stage, Windows set the net mask at 255.255.255.0 without letting me choose. Gross. Windows SBS tells me I have a "limited connection". I can't ping the gateway nor any other IP except localhost and it's own IP (10.20.0.8). Here is the Xen config file: kernel = '/usr/lib/xen-3.2-1/boot/hvmloader' builder = 'hvm' memory = '4096' device_model='/usr/lib/xen-3.2-1/bin/qemu-dm' acpi=1 apic=1 pae=1 vcpus=1 name = 'winexchange' # Disks disk = [ 'phy:/dev/wnghosts/exchange-disk,ioemu:hda,w', 'file:/mnt/freespace/ISO/DVD1_Installation.iso,ioemu:hdc:cdrom,r' ] # Networking vif = [ 'mac=00:16:3E:0A:D0:1B, type=ioemu, bridge=xenbr0'] # video stdvga=0 serial='pty' ne2000=0 # Behaviour boot='c' sdl=0 # VNC vfb = [ 'type=vnc' ] vnc=1 vncdisplay=1 vncunused=1 usbdevice='tablet' This config is working with others Windows XP domU's. I tried to change the ne2000 values with 0 and 1 with no effect. I am far from having good Windows administration skills so I guess I definitely need some help on this case. Thanks.

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• Why can't I connect to computers on my network using our external IP address?

  - by Kivin

  My home network is serviced by an ADSL line. The modem is in bridged mode. The router performs the PPPoE. Three computers are connected to the router: two wired Windows 7 boxes and a Ubuntu Linux box over wifi. The computers are hosting various forms of services including FTP and HTTP. The router has port forwarding mapped from the relevant ports to the reserved IP addresses for the computers. If I attempt to connect to a server inside the network, such as ftp://67.xx.xxx.xxx from inside the network, the request times out. However if I connect using the internally mapped address, such as ftp://192.168.0.100, all is well. This is a nuisance for setting up software, especially on the laptop which needs to be able to phone home from anywhere, and I just don't have enough expertise with networking to know why this is occurring to even have a clue whether it can be solved or not. edit: It should be noted that the servers can be accessible outside the network - say, at the starbucks across the street - perfectly fine, using the ISP provided address and the appropriate port.

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• windows 2003 under Hyper-V - can't send/receive ping

  - by glaucon

  I've installed Windows 2003 x64 R2 SP2 under Hyper-V (the Windows Pro 8 edition). I have a NIC configured but I can't move any traffic on it. In particular I can't send or receive Pings. Scoreboard There is a second VM running Ubuntu under the Windows 8 host which is able to send and receive pings from the host O/S . When I try to ping from Windows 2003 guest to Windows 8 host I get 'Request Timed Out'. When I try to ping from Windows 8 host to Windows 2003 guest I get 'Reply from 192.168.10.107 Destination Host Unreachable'. There's no problem pinging from the Ubuntu guest to the Windows 8 host and no problem pinging from the Windows 8 host to the Unbuntu guest. Environment Integration services are installed on Windows 2003. The windows 2003 needs a static IP address of 192.168.10.15. The Windows 2003 ipconfig output looks like this : While the host o/s ipconfig output looks like this : Event Logs The only things I can see in the event logs which is (a) looks signifcant and (b) is not related to the lack of networking is this : I'm not sure if that's significant or not. Hyper-V and NICs When the Windows 2003 guest was first booted it had no NIC; I subsequently added a 'Legacy Network Connector' which I couldn't get Windows 2003 to recognise; I subsequently removed that and added a 'Standard Network Connector' and at least on the surface this works ... only it doesn't. 'Virtual Network Type' is external. Although I've only mentioned ping there's no other evidence of network activity. 'Allow incoming echo request' is enabled on the Windows 2003 guest. HELP ? What else should I look at or do to resolve this problem ? EDIT 1: I should have said that I turned off the firewall on the W2003 server for a while and retested the pings; same result.

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• Windows Server 2003 DC hangs after network drivers update

  - by tcv

  Earlier today, we attempted to update the Broadcom BCM5716C network drivers on a Windows Server 2003. (Dell PowerEdge T310, FWIW). Since then we have not been able to boot the server in any normal mode. Safe Mode works. Safe Mode with Networking and regular bootups hang at "Applying Network Settings." I haven't tried Last Known Good Configuration nor have I tried Directory Services Restore Mode. I should also mention that the longest I've allowed "Applying Network Settings" was perhaps 30 minutes. I spoke to Dell since the server is under a basic warranty. They sent me the original Broadcom drivers. The trouble seems to be, however, that since I can only boot in Safe Mode, I can't install the application package as given. In safe mode, I receive the error: "The system administrator has set policies to prohibit this installation." I can install the drivers independently, but that doesn't allow the NICs to work. The most I've been able to get are Code 10 errors on each NIC. I plan to get back to the site tomorrow to attempt installation of a different NIC. I'm wondering what else I can try.

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• Problem setting up HP PhotoSmart C4783

  - by ProfKaos

  I am trying to get several PC's on a network to connect to my client's new wireless printer, the C4783. I initially installed the whole HP 'tsumami of software' the comes with the printer onto my laptop, connected to the printer over USB, and corrected it's networking config. My laptop now also can connect to and print on the printer over the wireless network, as is intended for all PC's. However, when I try and install the HP software on my client's netbook, the HP software cannot find the printer. Firewall was turned off during this time, so doesn't play a role. I tried re-installing all software, but I initially only got a "Repair" or "Uninstall". Choosing Uninstall triggers a lengthy process that ends with a sudden and forceful restart, after which the same "Repair" or "Uninstall" choices are present. Looks like uninstall doesn't. Any suggestions as to how I can begin diagnosing why my laptop has no problem connecting to the printer, but two others do? Wireless is unsecured, and no, nobody has to know where I am right now. :-)

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• Vista WHS Client stopped resolving local names

  - by andrewcr

  I’m running Windows Home Server PP2 in my home, with 3 client computers: two XP and one Vista. I have a router that provides my local DHCP and the server has a static IP address. The other day the Vista machine hung, and on reboot stopped resolving local names. It will show the green home server client icon in the system tray, but if I attempt to log in to the console, I get a “This computer cannot connect to your home server” message. If I ping the server name from the command line, it does not resolve, and gives a “could not find host” message. Oddly enough, if I browse the network, I can see the server, but double clicking on it fails. The other machines on the local network have no problems seeing the server, and the Vista machine has no problems resolving names from the internet, it just can’t see any local machines. I’m aware that I can work around this by adding entries to my HOSTS file (it does work), but I’d like this to work the way it’s “supposed” to. I’m an experienced computer user and developer, but not a networking whiz. Can anyone tell me how local name resolution is supposed to work in my environment and/or suggest ways to troubleshoot this? Thanks, Andy

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• Cause of slow download speed on a particular EC2 instance?

  - by James

  I have a networking issue I'm trying to solve. I have two EC2 instances, same zone, same type. On one of the two EC2 instances (the 'bad' instance), the download speed is really poor (200k/s), while on the other (the 'good' instance), the download speed is fine, comfortable at 30M/s +). To clarify, I'm talking about downloading files to the EC2 instance while ssh'd into the server, e.g running wget with a large file. I've tried different files, including S3 objects and a large linux ISO from elsewhere. Running ethtool eth0 only returns 'Link detected: yes' for both. When running ifconfig, both return the same for most part, aside from how the good instance shows no error packets yet the bad instance shows many: UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:168372370 errors:5075643 dropped:0 overruns:0 frame:0 TX packets:122116480 errors:0 dropped:0 overruns:0 carrier:0 Both servers are configured the same, at least were supposed to be. How can I go about diagnosing the cause for the slow download speed? Is there anything particular to EC2 instances that could cause this? Having trouble knowing where to start. Thanks for any help!

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• Windows 7 - Windwos XP - sharing - why isn't working?

  - by durumdara

  Hi! This is seems to be "hardware" and not "software" / "programming" question, but I need to use this share in my programs, so it is "close to programming". We had an XP based wireless network. The server is XP Professional, the clients are XP Home (Notebooks). This was working well with folder sharing (with user rights, not simple share). Then we replaced the one of the notebook with Win7/X64 notebook. First time this can reach the server, and the another client too. Later I went to another sites, and connect to another servers, another networks. And then, when I return to this network, I saw that I cannot connect to this server. Nothing of resources I see, and when try to dbl click on this computer, I got login window, where I can write anything, never I can login... The interesting part, that: Another XP home can see the server, can login as quest, or with other user. The server can see the XP home notebook. The Win7 can see the notebook's shared folders, and XP home can see the Win7 shared folders. The server can see the Win7 folders, BUT: the Win7 cannot see the server folders. Cannot see the resources too... The Win7 is in "work networking group", the group name is not mshome. I tried everything on the server, I tried to remove MS client, restore it with simple sharing, set guest password, etc., but I lost the possibilities to access this server from Win7. Does anyone have any idea what I need to see, what I need to set to access these resource - to use them in my programs? Thanks for every info, link: dd

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• virtualisation with kvm: export services from guest to the host

  - by ascobol

  Hello, I would like to export some services from the guest os to the host os, via kvm, and by the same way learn some things about networking. I have tried the following commands: In the host (kubuntu 10.4): $ sudo tunctl -u ascobol Set 'tap0' persistent and owned by uid 2401 $ sudo ifconfig tap0 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 The ifconfig command returns: $ /sbin/ifconfig tap0 Link encap:Ethernet HWaddr 3e:4e:e3:cc:bc:92 inet addr:192.168.2.1 Bcast:192.168.2.255 Mask:255.255.255.0 inet6 addr: fe80::3c4e:e3ff:fecc:bc92/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:17 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) $ route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0 0 tap0 Then I run the virtual machine (ubuntu server 10.4): $ sudo kvm -hda ubuntuserver104.qcow2 -net nic -net tap,name=tap0,script=no (I'm using sudo because without it fails with the following message:) warning: could not configure /dev/net/tun: no virtual network emulation With sudo the virtual machine boots, I just get this message: pci_add_option_rom: failed to find romfile "pxe-rtl8139.bin" In the virtual machine: $ ifconfig eth0 192.168.2.2 netmask 255.255.255.0 broadcast 192.168.2.255 Now if I run: $ ssh 192.168.2.2 I just get a No route to host What is wrong with this setup ? Thanks !

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• Is encryption really needed for having network security? [closed]

  - by Cawas

  I welcome better key-wording here, both on tags and title. I'm trying to conceive a free, open and secure network environment that would work anywhere, from big enterprises to small home networks of just 1 machine. I think since wireless Access Points are the most, if not only, true weak point of a Local Area Network (let's not consider every other security aspect of having internet) there would be basically two points to consider here: Having an open AP for anyone to use the internet through Leaving the whole LAN also open for guests to be able to easily read (only) files on it, and even a place to drop files on Considering these two aspects, once everything is done properly... What's the most secure option between having that, or having just an encrypted password-protected wifi? Of course "both" would seem "more secure". But it shouldn't actually be anything substantial. I've always had the feeling using any kind of the so called "wireless security" methods is actually a bad design. I'm talking mostly about encrypting and pass-phrasing (which are actually two different concepts), since I won't even consider hiding SSID and mac filtering. I understand it's a natural way of thinking. With cable networking nobody can access the network unless they have access to the physical cable, so you're "secure" in the physical way. In a way, encrypting is for wireless what building walls is for the cables. And giving pass-phrases would be adding a door with a key. So, what do you think?

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• Network driver for Hyper-V restore from Windows Home Server

  - by Philipp Schmid

  I have backed up Windows Server 2008 running virtualized on Hyper-V to a Windows Home Server 2008 SP1 (I know I should have backed up the VHD instead). Now I need to restore the contents of the VM from WHS. I have created a restore CD ISO and used it to create a new VM. It all works as advertised up to the point where the restore process wants to load the network drivers (it only finds 4 disk drivers on the restore CD. but no network drivers). So I created a virtual floppy and copied the contents of 'Home Server Drivers for Restore onto it. But no luck! I have tried moving the 4 subdirectories into the root of the floppy, but that didn't work either. Finally, I started another instance of the WS 2008 to identify the network driver that the virtualized instance is using (%WINDOWS%\system32\drivers\netvsc60.sys) and copied that file onto the virtual floppy, without success. Does anyone have any suggestions on how to get networking working on a Hyper-V instance running off the Windows Home Server Restore CD? UPDATE: As suggested by delenda, I have added a legacy network adapter to my VM, and indeed I now get a network driver listed! However, the WHS it still not found, even after entering the home server name manually. PHS

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• network latency, TCP and UDP packets

  - by user115848

  Hello recently my network has started to cause me lots of problems. I have a cable modem, connected to a tp-link router (with some port forwarding). Everything was working fine then i started to get lots of udp (port 53) "UNREPLIED" logs in the router. Now there are tcp UNREPLIED logs too. This is causing lots of latency and failed connections when trying to connect to different internet sites. Also, we run an openfire server for spark connections, and I believe its causing connectivity issues for some users who are trying to connect using Spark (some people connect fine, others don't). Please see screen shot below for packet logs. It has to be something internally, as I connected straight to the comcast modem and i was able to connect to the internet and various sites as normal. I tried to swap out the router with a different and got the same issue. I scanned both my internal dns servers for viruses or malware and it came up empty. Another anomaly is that when i try to connect to www.cnn.com, i get redirected to the different site. I scanned my own machine for hijacks. Not sure if this is related to the networking issue. Please let me know if you have any ideas for troubleshooting.

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