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• Possible to IPSec VPN Tunnel Public IP Addresses?

  - by caleban

  A customer uses an IBM SAS product over the internet. Traffic flows from the IBM hosting data center to the customer network through Juniper VPN appliances. IBM says they're not tunneling private IP addresses. IBM says they're tunneling public IP addresses. Is this possible? What does this look like in the VPN configuration and in the packets? I'd like to know what the source/destination ip/ports would look like in the encrypted tunneled IPSec Payload and in the IP packet carrying the IPSec Payload. IPSec Payload: source:1.1.1.101:1001 destination:2.2.2.101:2001 IP Packet: source:1.1.1.1:101 destination:2.2.2.1:201 Is it possible to send public IP addresses through an IPSec VPN tunnel? Is it possible for IBM to send a print job from a server on their network using the static-nat public address over a VPN to a printer at a customer network using the printer's static-nat public address? Or can a VPN not do this? Can a VPN only work with interesting traffic from and to private IP addresses?

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• Using proxy.pac to access Apache 2 with a hostname?

  - by leeand00

  Note that I do not have a DNS on my network, and that is why I am resorting to using a proxy.pac file. I would like to be able to access my development Apache 2 server using a name instead of an ip without setting up a full blown DNS. I am aware of setting names in the C:\Windows\System32\drivers\etc\hosts file and the /etc/hosts files, however I cannot edit the hosts file on all of the devices that I am testing the site on. I've added a proxy.pac file to my Apache2 server and pointed my browsers settings to it at: http://192.168.2.221/proxyutils/proxy.pac ...where 192.168.2.221 is thehostname's ip address. I set the above URL in Firefox in the following manner: From the menubar selecting "Edit-Preferences" In the resulting "Firefox Preferences" window clicking the "Advanced" tab. Clicking the "Network" tab Clicking the "Settings" button. Selecting the "Automatic proxy configuration URL:" radio button. Entering http://192.168.2.221/proxyutils/proxy.pac and pressing OK. The contents of the proxy.pac file on the Apache server function FindProxyForURL(url, host) { if( dnsDomainIs(host, "thehostname") ) return "PROXY 192.168.2.221:80"; return "DIRECT"; } In Firefox I then access the following URL: http://thehostname/wp-blog/ And instead of the development version of the Wordpress blog I am trying to access I get a URL of http://thehostnamehttp/thehostname/wp-blog/ in my address bar and a 404 Not Found page in the browser window. Looking over proxy.pac, it seems like calling dnsDomainIs shouldn't work considering I don't have a DNS setup on my network, but I've also tried just comparing the host argument with the string "hostname" and it yielded the same result, even after modifying the proxy.pac file and clicking the reload button near the proxy settings. This could also be a Wordpress problem, since I've noticed that directories without Wordpress seem to function perfectly normally. (see cross post here) Is there any way I can modify my configuration so that I can access the site using http://thehostname/wp-blog/ ?

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• Vlans and subinterfaces

  - by Adeodatus

  I've inherited a moderate size network that I'm trying to bring some sanity to. Basically, its 8 public class Cs and a slew of private ranges all on one vlan (vlan1, of course). Most of the network is located throughout dark sites. I need to start separating some of the network. I've changed the ports from the main cisco switch (3560) to the cisco router (3825) and the other remote switches to trunking with dot1q encapsulation. I'd like to start moving a few select subnets to different vlans. To get some of the different services provided on our address space (and to separate customers) on to different vlans, do I need to create a subinterface on the router for each vlan and, if so, how do I get the switch port to work on a specific vlan? Keep in mind, these are dark sites and geting console access is difficult if not impossible at the moment. I was planning on creating a subinterface on the router for each vlan then setting the ports with services I want to move to a different vlan to allow only that vlan. Example of vlan3: 3825: interface GigabitEthernet0/1.3 description Vlan-3 encapsulation dot1Q 3 ip address 192.168.0.81 255.255.255.240 the connection between the switch and router: interface GigabitEthernet0/48 description Core-router switchport trunk encapsulation dot1q switchport mode trunk show interfaces gi0/48 switchport Name: Gi0/48 Switchport: Enabled Administrative Mode: trunk Operational Mode: trunk Administrative Trunking Encapsulation: dot1q Operational Trunking Encapsulation: dot1q Negotiation of Trunking: On Access Mode VLAN: 1 (default) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none So, if the boxen hanging off of gi0/18 on the 3560 are on an unmanaged layer2 switch and all within the 192.168.0.82-95 range and are using 192.168.0.81 as their gateway, what is left to do, especially to gi0/18, to get this working on vlan3? Are there any recommendations for a better setup without taking everything offline?

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• Firebox 1250e Core Failing?

  - by Noah

  We have 2 Firebox 1250e Core firewall boxes in our production environment, serving as an active and passive mode. A few months back, the active box was flashing a warning light, so our consultant removed it, and plugged it in to a test network. Everything appeared to be working fine, so he reloaded it into the production environment, and we didn't see any other issues. Fast forward to last week, and out network was constantly dropping connections over RDC, timing out, and performing as if there was a traffic issue. I turned off the production box and everything began to work fine immediately. At this point though, I'm not sure how to proceed. Should the box be completely replaced? Is there any recommended testing we could do to determine if there is a failure of some type with this device? Should we try upgrading the software on it? I know the environment isn't the issue, since the passive box (which is now the active one) is working fine. We'd like to have 2 in production though for safety failover purposes. I am not a network admin, but am hoping someone here might be able to provide some guidance.

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• How can I change the default location/action of 'Open Outlook Data File' in Outlook 2010?

  - by Chadddada

  I have recently deployed a Remote Desktop Host server that functions as a remote Microsoft Office 2010 work space for users. In part of the locking down of this server I have installed all programs on the D: drive and, through the use of Group Policy, hidden all the drives on the server from standard users. In addition to hiding these drives I am not allowing users to save anything locally (on the server) or open Libraries. However one of the functions of the server is to provide the Outlook client. Often users will have the .PST file stored on a network location and want to open this in Outlook. Can I change the default action or location that File Open Open Outlook Data File looks or tries to pull the file from? The default location seems to be under Users / Libraries. When click 'Open' you get a warning: This operation has been cancelled due to restrictions in effect on this computer. Clicking OK drops the user into a small menu that shows attached network drives under Computer. Can I instead have the 'Open' click drop the users in a defined network drive or just open computer and allow them to select a share? I don't want them to see the error message. A solution that looks to have been used for Office 2000/03 is: Key: HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook Value name: ForceOSTPath Value type: REG_EXPAND_SZ Value: path to your storage folder I am not sure if there is a better way to do this now OR if this even works with Office 2010.

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• Can't connect remotely to Windows Server 2008 R2

  - by JohnyD

  I have a new Dell R710 server running Windows Server 2008 R2. I one of it's 4 nic's set up and the rest are not being used. I have successfully given it an ip address, network mask, and dns servers. I can ping and resolve this machine from anywhere else in the network. However, when I try to connect to it via RDP it does several things: 1) it might just outright refuse me with the message, "This computer can't connect to the remote computer. Try connecting again." 2) it might connect me and let me chose the account I would like to log on as... but when you select an account then you receive the same message as in #1 3) it might actually allow you to connect but only for about 1 minute and then you receive the same message and it closes your session. I have configured the firewall service to allow for RDP over the domain network connection. This didn't have any noticible effect. I have now disabled the firewall for all 3 networks and have even stopped the Windows Firewall service. I am still having the same issue. I am new to Server 2008 R2 and things are very different. Please give me any advice you can on how to resolve this issue and/or any other gotchas that are sure to come my way. The 2003 - 2008 learning curve seems steep. Thanks

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• Server 2012, Jumbo Frames - should I expect problems?

  - by TomTom

  Ok, this sound might stupid - but is there any negative on just enabling jumbo frames in practice? From what I understand: Any switch or ethernet adapter that sees a jumbo frame it can not handle will just drop it. TCP is not a problem as max frame size is negotiated in the setinuo phase. UCP is a theoretical problem as a server may just send a LARGE UDP packet that gets dropped on the way. Practically though, as UDP is packet based, I do not really think any software WOULD send a UDP packet larger than 1500 bytes net without app level configuration changes - at least this is how I do my programming, as it is quite hard to get a decent MTU size for that without testing yourself, so you fall back in programming to max 1500 packets. The network in question is a standard small business network - we upgraded now from a non managed 24 port switch to a 52 port switch with 4 10g ports (netgear - quite cheap) and will mov a file server to 10g for also ISCSI serving. All my equipment on the Ethernet level can handle minimum 9000 bytes and due to local firewalls I really want to get packets larger (less firewall processing), but the network is also NAT'ed to the internet. On top, different machines move around (download) large files (multi gigabyte area) quite often for processing. The question is - can I expect problems when I just enable jumbo frames? Again, this is not totally ignorance - I just don't see programs sending more than 1500 byte UDP packets (if that is a practical problem please tell me) and for TCP the MTU is negotiated anyway. if there is a problem I can move to a dedicated VLAN, but this has it's own shares of problems as basically most workstations must then be on both VLAN's.

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• trying to figure out how to bridge two virtual networks together and in turn bridge that to the internet for a virtual inline IDS/IPS system

  - by Tony robinson

  I'm trying to figure out how to bridge two vmware (server or workstation, workstation) or virtualbox networks together with a linux IDS/IPS system transparently inline between both the virtual networks. How do I accomplish this? I understand how to bridge to virtual networks together, but how to I make the linux virtual machine sit between them and force traffic to go across the transparent bridge? I would like to have something along the lines of: vmnet a various vms host-only network ---- inline linux box vmnet a boxes forced to go through here to get to the internet --- vmnet b network with internet access configured as either NAT or bridged -- internet I know that basically the linux box needs two virtual nics, one on vmnet a and vmnet b, but other than that, I don't know how to force all the traffic to go across the "transparent" bridging linux box on its way to the internet. Do vmnet a and b have to be the same ip network with the same default route? does vmnet a not have a default route and vmnet b have a default route? I've read in vmware forums that on the linux host you need to change permissions on the vmnet files for promiscuous mode? is this true? how do you configure this scenario on a windows box?

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• Firefox not using Kerberos despite being configured to

  - by Nicolas Raoul

  I am deploying Linux/Firefox on a corporate Kerberos network. I followed this Kerberos-on-Firefox procedure but still Firefox does not connect via the company's Kerberos. I am using Firefox 3.0.18 on RedHat EL Server 5.5 Here is what I did: Run kinit on the command line to create a Kerberos ticket Check with klist: the ticket is valid until tomorrow, service principal is krbtgt/[email protected]. In Firefox, set network.negotiate-auth.trusted-uris and network.negotiate-auth.delegation-uris to .dc.thecompany.com. Load the company's portal page via its full hostname: http://server37.thecompany.com/alfresco. (note: server37 is actually the machine I am running Firefox on, but that should not be a problem I guess) PROBLEM: the company's intranet portal still serves me the login/password page. The same portal correctly uses Kerberos on Internet Explorer/Windows 7 machines, same settings, and shows the user's personal page. The server does not see any Kerberos request coming. Did I do something wrong? I enabled NSPR_LOG_MODULES=negotiateauth:5 as explained here, but the log file stays empty.

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• Restricting Access to Application(s) on Point of Sale system

  - by BSchlinker

  I have a customer with two point of sale systems, a few workstations and a Windows 2003 SBS Server. The point of sale systems are typically running QuickBooks Point of Sale and are logged in with a user who has restricted permissions / access (via Group Policy). Occasionally, one of the managers needs to be able to run a few additional applications -- including some accounting software. I have created an additional user for this manager, allowing them to login and access the accounting software. The problem is, it can be problematic to switch users on the system, as QuickBooks takes a few minutes to close (on POSUser) and then reopen (on ManagerUser). If customers are waiting, this slows things down drastically. Since the accounting software is stored on a network drive, it would be easiest if the manager could simply double click something, authenticate against the network drive / domain controller and then the program would launch. When they close the program, the session to the network drive would be lost and the program would no longer be accessible. Is there any easy way to do this? Both users are on a domain and the system is Windows 7. I just don't want to require the user to switch back and forth. In a worst case scenario, they forget to switch back and leave the accounting software wide open.

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• How to make Virtualbox, OpenVPN, and Win2008 Web R2 like one another?

  - by Aquitaine

  Back with web developer guy wearing net admin hat. Hopefully this is an easy one. We have two servers on a public network at a hosted facility. Server A is our public-facing web server and server B is our database server. Both are running Windows 2008 Server R2 Web Edition. We want Server B isolated from everything except Server A, such that anyone who has to connect to server B goes through the VPN on Server A. It's not perfect since we have no access to do this on the router side, but it's what we've got. We've set up VirtualBox and OpenVPN Access Server on Server A. It has one network interface set to 'NAT' mode, such that OpenVPN gets its IP at 10.0.2.x, and to connect to the OpenVPN interface, I go to the local IP for the Virtualbox network adapter, 192.168.56.x, which works as I configured the appropriate ports using VBoxManage. My question is, do I need to be using Bridged Networking and give the VPN server its own IP, or is there some way to tell the server (either Windows or the Virtualbox OpenVPN) that 'any public connection on the real external IP on port X should be directed to this internal LAN address of 192.168.1.x on port Y'? OpenVPN itself doesn't seem to be aware of the server's real external IP unless we put it in Bridged networking mode; is that necessary or advisable? We're without RRAS since this is Web edition, but I feel like what we're going for is pretty simple. Thanks! Aq

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• Issues with VPN functionality

  - by Xorandor

  I've been working on setting up VPN connectivity to our office location. We bought a Cisco WRV210 which have a builtin VPN server. Cisco has some software QuickVPN, which is not as quick and easy as I had thought. I've had mixed experiences on different machines with connecting. Instead I configured an IPSec VPN tunnel following a guide from TheGreenBow here http://www.thegreenbow.com/doc/tgbvpn_cg_linksys_wrv200_en.pdf I followed their instructions and tried out an evaluation of their software, and VPN connection should be working ok. I'm able to do RDP to a machine on the network (using IP address, not machine name) and ping the router etc. What I'm trying to solve are two things: It's not like I'm "really" on the network. Or at least I'm restricted to some degree when going through the VPN. I can't access a machine on the network using machine name, only IP. I can't ping a machine, but the router just fine. Could this be that something is not set up properly? If so, I can ofcourse supply additional information. Second, when I log onto the VPN, I would really like my outgoing connection to go through the internet connection of the remote location. Basically if I connect to the VPN I want my outgoing IP to be that of the remote location's (needed for some IP resctrictions on some of our servers). At a previous work location it worked like this when we connected to our office VPN over PPTP and the builtin windows VPN client. I'm not a huge expert on the topic, so any hints will be appreciated.

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• Cannot connect to windows server by name over vpn connection

  - by ErocM

  I have a rented dedicated windows server on a public ip that is acting as a SQL Server and VPN server. I need to connect to this server via computer name to get replication in place. I cannot use an ip address due to this issue: So, due to this, we are going the VPN route. That is my primary issue: After I am connected to this server's vpn, I can connect to SQL Server using the ip address but I cannot connect by the computer's name as you can see below... Right now, there is no hardware firewall on it since I had it removed to test this issue. I am running Windows 2008 Enterprise Server as the VPN server. I am not sure if the route print will help any from the workstation trying to connect but here is the info: IPv4 Route Table Active Routes: Network Destination Netmask Gateway Interface Metric 10.0.0.0 255.0.0.0 10.0.0.1 10.0.0.2 21 10.0.0.2 255.255.255.255 On-link 10.0.0.2 276 Any other info needed? Thanks for the help! ========= CLARIFICATION ON A FEW THINGS #1 ========= This is the server's info: This is the workstation that is trying to connect: I connect to the server via "Control Panel\Network and Internet\Network and Sharing Center\Connect or Disconnect" You can see here that I am connected: ========= CLARIFICATION ON A FEW THINGS #2 ========= I've tried to connect directly to the Sql Server as I did above but with the computers name and I couldn't get to it. Here I am trying to net view it from the workstation and it couldn't find it:

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• Window 7 Host does not answer to ping

  - by gencha

  Today I tried printing on a shared printer on one of our homegroup members. Sadly it did not work (printer marked as offline). Shortly after, I noticed I can't even ping the machine that owns the printer (I also can not remotely access it in any other way I've tried). Currently I'm trying to ping the machine from the router both computers are connected to (and my machine in question doesn't answer). I do receive the echo requests (as verified with WireShark). I also added a rule in the Windows Firewall to specifically allow ICMP echo requests, but that didn't change anything. I also tried netsh firewall set icmpsetting 8 enable, but that didn't change anything either. Completely disabling the Windows Firewall has no effect on the issue either. One has to wonder, where does Windows log when and why it ignored any incoming packets? How can I get to the bottom of this? Here are some ways I found to dig deeper into the issue: Enabling logging on the Windows Firewall Enabling Windows Filtering Platform Auditing Both methods at least give more insight into the issue. The plain log file is full of entries like this: 2011-11-11 14:35:27 DROP ICMP 192.168.133.1 192.168.133.128 - - 84 - - - - 8 0 - RECEIVE So the ICMP packets are being dropped as if that was intended. The Event Viewer now gives a little bit more details: The Windows Filtering Platform has blocked a packet. Application Information: Process ID: 4 Application Name: System Network Information: Direction: Inbound Source Address: 192.168.133.1 Source Port: 0 Destination Address: 192.168.133.128 Destination Port: 8 Protocol: 1 Filter Information: Filter Run-Time ID: 214517 Layer Name: Receive/Accept Layer Run-Time ID: 44 This same entry is always repeated with 2 points of information changing: Process ID: 420 Application Name: \device\harddiskvolume2\windows\system32\svchost.exe The service host with the PID 420 is the host for the following services: Windows Audio DHCP Client Windows Event Log HomeGroup Provider TCP/IP NetBIOS Helper Security Center Additionally, there is currently this problem with the same machine: Even though my network is set to be a "Home network", I am unable to create a new homegroup.

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• .NET 2.0 Application now running slow on IIS 7.5

  - by Valien

  I recently moved (and still in testing) an application from a Windows 2003 Server (Physical box) running IIS 6.x to a Windows 2008 R2 Standard (VM) IIS 7.5 server. The application is a .NET framework 2.0 application and is running under a 2.0 App Pool. This site works great except for one thing: Takes forever to get a request back. I've been tracking it with Chrome Inspect Element and it queries the site and can take up to 45 seconds to answer. Now when it does the page(s) render instantly but it's that initial request that's killing it. I see no error logs or issues with the application or Windows Event Viewer or even IIS logs so not sure where to start looking next. Some new changes was that previously the app resided behind a Pix firewall and now is behind a larger network environment in a DMZ zone (and I believe NetScaler is also being used to manage the network). I do not have rights/abilities to look at the network itself but can contact the Data center folks to look deeper into this but I wanted to make sure it's not my application that might be causing the slowdown or IIS. In summary: .NET 2.0 application works great in IIS 6.x Application moved to an IIS 7.5 server and now slow on rendering but when it does render responds back with pages instantly. Edit for solution Found out that it was the SOAP calls that were slowing the site down. In the new datacenter my application cannot request SOAP calls and so they time out after 40-45 seconds or so. Now trying to find out if I can install a proxy server to redirect this...

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• CentOS Latency High Troubleshooting

  - by Sarah Weinberger

  I have two CentOS servers connected via a 10 Gb fiber optic cable with a network emulator connected between them. All three units sit on a desk in the lab. There is also a regular 1 Gbit Ethernet cable connected to each of the machines, which provide internet connectivity. When I set the latency to something roughly below 30 ms, all is fine. When the latency gets to 70ms and above, and definitely 130ms, the network layer suspends. For instance, if I set the latency (delay) to 70ms, then launching TeamViewer (or any other application that uses network connectivity) never happens or does not work. There is no timeout message, simply no response. I have to lower to latency back down to zero to see any response and have the box start working. What is the problem and how would I go about fixing it? It seems to me some sort of setting in Linux causes one of the CentOS networking drivers to sit in an infinite loop or something. eth0 is the connection to the internet, all settings are default eth2 is the 10 Gbit fiber optic connection to the other computer with the MTU set to 9600 with all other parameters at default values.

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• DNS: how to get local server to superimpose results over authoritative server?

  - by growse

  I've got a domain for which the DNS I control, and is hosted on the internet. I also have a NAT'd internal network (192.168.0.0/24) which has internet access, and which I also control. On this internal network, I also have a DNS resolver. DNS software on both is PowerDNS. What I want to be able to do is for the DNS resolver on the internal network to be able to add/change records of queries and results that come down from the authoritative server. For example, the authoritative server might have a single record for animal.example.com: animal.example.com. IN AAAA 2001:140:283::1 However, I'd like it so that when internal clients do a dns lookup for animal.example.com, they might get back the following: animal.example.com. IN AAAA 2001:140:283::1 animal.example.com. IN A 192.168.0.2 Obviously, I could set up the internal DNS server to pretend to be authoritative for example.com, but that would require a fair bit of effort to keep the main DNS server and the internal DNS server in sync for the records which are the same between both. If the internal DNS server could somehow be made a slave of the main DNS server, but also have the provision to add its own results in, that would be ideal. Is this possible?

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• Install and enforce a scheduled task across a Windows domain

  - by Ricket

  We have a small domain of about 70 Windows computers (XP and 7). We want to schedule a command (an update mechanism) to run on all computers periodically, and we want the task to run regardless of the computer's connection to our network (i.e. the task should run even on a laptop that isn't connected to our VPN). We have a Microsoft System Center Essentials 2010 server so that might come in handy. The options I see are these: Do it completely manually. Install the scheduled task by hand or remotely using psexec (and the at command?) for each computer in our network. Enforce that newly imaged computers should have this task installed on them before deployed to the employee, or the task should be in the image. High initial cost (having to do this for each of 70 computers) but building it into the image might work... But there is some maintenance in making sure the task is added to everything. And I fear that a year or two down the road, we will have forgotten about it or gotten sloppy or had new IT employees who miss this step and some computers won't have the task. Having one of our servers run a script that loops through all computers and psexec's the command on each computer in the network -- it would only run on running, connected computers, so this solution wouldn't work. I suspect SCE could do something like this too, but again this is not a good solution. Neither of these are ideal, and I'm certain there is a better way to do it -- right? What is the best way to accomplish this task?

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• Android webbrowser returns code 500 for webpage on Nginx webserver

  - by Paxxil

  Hey! I've come to a very weird behavior of a web browser on android mobile phone (I've tried HTC Wildfire and HTC Desire phones). I have a web server with Nginx v0.8.54. When i try to open a web page on the phone it shows me error: The requested item could not be loaded! (Status code: 500) BUT it only happens when I am requesting page through Mobile network. On Wifi it works just fine .... but there is more .... if I stop Nginx and start Apache web server it works just fine on both Mobile network and wifi. I've also tried other mobile network and it is the same behavior. Some server stats: Firewall is OFF Selinux is OFF the web page (using Nginx web server) opens normally on any other browser (IE, FF, Opera, Chrome, Safari) on the laptop or PC Nothing in nginx error.log This is the only entry in access.log when the page is requested: xxx.xxx.xxx.xxx - - [17/Mar/2011:11:19:49 -0500] 200 "GET / HTTP/1.1" 27405 "-" "Mozilla/5.0 (Linux; U; Android 2.2; en-gb; Desire_A8181 Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1" "-" index.html has only "Hello World" string in it. There is no fishy javascript or anything else. .... but there is even more.... if i open the same page on another server, with the same Nginx build, with the same server and web server configuration.... it opens just fine. if anyone has any idea on what may be going on, i would really appreciate it if you let me know. Thanks! EDIT: i forgot to mention that page opens OK on Iphone and Nokia

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• Linux VLAN Bridge

  - by raspi

  I have home network with VLANs, one for LAN, one for WLAN and one for internet. I'd like to use bridging so that instead of configuring these same VLANs to every machine, they had own VLAN ID and bridges were LAN, WLAN and internet. I've tried it but for some reason keep-alive/ttl seems to get broken because SSH sessions etc suddenly disconnects. We have this same setup working in workplace for 4+ years with 100+ customers but it's custom firewall/router hardware so accessing it is impossible. I know that it runs Linux. So what is Debian/Ubuntu default network settings doing wrong or is it just NIC driver/hw problem? I've tried to mess araund with ttl etc settings without any luck. The bad stuff is happening in the bridge because current VLAN-only setup works fine. interfaces: auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 allow-hotplug eth1 iface eth0 inet static iface eth1 inet static auto vlan111 auto vlan222 auto vlan333 auto vlan444 auto br0 auto br1 auto br2 # LAN iface vlan111 inet static vlan_raw_device eth0 # WLAN iface vlan222 inet static vlan_raw_device eth0 # ADSL Modem iface vlan333 inet static vlan_raw_device eth1 # Internet iface vlan444 inet static vlan_raw_device eth0 # LAN bridge iface br0 inet static address 192.168.0.1 netmask 255.255.255.0 bridge_ports eth0.111 bridge_stp on # Internet bridge iface br1 inet static address x.x.x.x netmask x.x.x.x gateway x.x.x.x bridge_ports eth1.333 eth0.444 bridge_stp on post-up iptables -t nat -A POSTROUTING -o br1 -j MASQUERADE pre-down iptables -t nat -D POSTROUTING -o br1 -j MASQUERADE # WLAN bridge iface br2 inet static address 192.168.1.1 netmask 255.255.255.0 bridge_ports eth0.222 bridge_stp on Sysctl: net.ipv4.conf.default.forwarding=1

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• Online computer not responding to pings

  - by mastercork889

  I was doing a bit of scanning on my network lately, knew all the hostnames to each computer connected. But whilst pinging one of them ping returned Request timed out.. This is strange as I know the computer is online and that the computer responds correctly to pinging on a different (enterprise) network. Is there something on the computer, my network, or my computer that is bugging with this? - That's just a sub-question, I don't expect this to be the main answer. The real question: Why does this happen? Why does pinging the IP4 address not work? EDIT : Pinging the Hostname used to default to the IP4 address, but now it defaults to the IP6 address. Why does this happen? But now that it pings using IP6, how come it all of a sudden works? > ping -6 THE_COMPUTER Pinging THE_COMPUTER [lengthy IP6 address] with 32 bytes of data: Reply from [lengthy IP6 address]: time=1ms Reply from [lengthy IP6 address]: time=1ms Reply from [lengthy IP6 address]: time=1ms Reply from [lengthy IP6 address]: time=1ms Ping stats: Sent = 4, Recieved = 4, Lost = 0 (0% loss) But when this is done using IP4 it doesn't work. So there are now two questions: How come IP6 works and not IP4? Why does IP4 not work?

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• iSCSI performance questions

  - by RyanLambert

  Hi everyone, apologies for the long-winded post in advance... Attempting to troubleshoot some iSCSI sluggishness on a brand new vSphere deployment (still in test). Layout is as such: 3 VSphere hosts, each with 2x 10GB NICs plugged into a pair of Nexus 5020s with a 10gig back-to-back between them. NICs are port-channeled in an active/active redundant fashion (using vPC-mac pinning for those of you familiar with N1KV) Both NICs carry service console, vmotion, iSCSI, and guest traffic. iSCSI is on a single subnet/single VLAN that is not routed through our IP network (strictly layer2) Had this been a 1gig deployment, we probably would have split the iSCSI traffic off onto separate NICs, but the price/port gets rather ridiculous when you start throwing 4+ NICs to a server in a 10gigabit infrastructure, and I'm not really convinced it's necessary. Open to dialogue/tech facts re: this, though. At this point even a single VM guest will boot slowly to iSCSI storage (EMC CX4 on the same Nexus 5020 10gig switches), and restores of VMs from iSCSI take about twice as long as we'd expect them to. Our server folks mentioned that if we split the iSCSI off onto its own NIC, performance seems significantly better. From a network perspective, I've run through the variables I can think of (port configuration errors, MTU problems, congestion etc.) and I'm coming up dry. There really is no other traffic on these hosts other than the very specific test being performed at the time. Important thing to note is that guest traffic works just fine... it seems storage is the only thing affected by whatever gremlin exists. Concluding that we're not 'overutilizing' the network infrastructure since we're doing hardly anything, I'm just looking for some helpful tips/ideas we can use to resolve this... preferably without hurling extra 10gig NICs that are going to sit around 10% utilization while we've got 70+% left on our others.

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• Intermittent extrememly long response times when downloading documents

  - by pap

  I have a Java web application running om Tomcat 7 with an Apache httpd 2.2 fronting with mod_jk/AJP. One part of the application is serving files (up to 4mb size). Now, normally this all runs very smooth with stable, low response-times. However, in rare instances (<0.1% of downloads), the downloadtime will go beyond 1 minute. After activating the ThreadStuckValve in Tomcat, I can see that the long responses seem to be stuck at org.apache.tomcat.jni.Socket.sendbb(Native method) i.e network I/O. At most, these long-running downloads take 5 minutes, which I strongly suspect is because of the default 300 second timout in Apache 2.2 (http://httpd.apache.org/docs/2.2/mod/core.html, "TimeOut directive"). To me, this looks like network problems. The Apache timeout (if that is what is kicking in at the 5 minute mark) indicates that ACK packets are not being transmitted correctly. My questions are what could be causing this? Closed browser at receiving end but socket not signaled as closed properly? Packet loss or some other network failure in transit? Where would I start troubleshooting this? We're running Tomcat and Apache on Windows server 2008-R2 in a vmware virtualized server.

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• Remote connection to a Windows 2008 Server Web edition

  - by Lorenzo

  Hello I have just installed Windows 2008 web server to have a development/test site on my office. In the test network I only have 2 machines: Windows server 2008 Web Edition Vista x64 client machine with Visual Studio The client and the server are networked using a NETGEAR router. I have enabled Remote desktop on the server and when I try to connect to it within the Vista client I get the credential window as in the following screenshot. But even if I write the correct credentials I am not able to remote login on the server. Where am I doing wrong? Update 1 I have even tried to create a folder share on the server. But I am not able to access it for the same reason. User or password invalid it says. But this is impossible as I am logging in the server with the same credentials. Update 2 If I try to browse the network from the RDP client I receive a message saying that there are no server running Terminal Services in my network.... :O

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• How to bypass vpn talking to VMWare Guest?

  - by marc esher

  Greetings. Network/VPN n00b question here. I'm running VMWare Workstation with a Guest Windows 2003 Server. It has SQL Server 2000 installed. The sole purpose for this Guest is to house SQL Server... it needn't have internet access or access to any other resources on the network other than the host. When launch Check Point VPN software, the host routes through the company network before it connects to the guest ... i.e. it's no longer a direct connection. I assume this is just how things are supposed to work. However, what's happening is that the connection between my host and the SQL Server instance on the guest intermittently drops. It's not consistent, and some databases on the server will be responsive while others aren't. It appears that the databases with the most traffic on the guest (the ones I'm hitting with load tests) are the ones that become intermittently unresponsive. This problem only manifests when VPN is on; when it's off, I can pound away on this database with no troubles. Thanks for any advice!

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