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• Linux pptp client stops working after several hours

  - by Aron Rotteveel

  Here's the situation: Setup: 1 Windows Server 2008 machine acting as a Domain Controller and RRAS server 1 CentOS machine in a datacentre located elsewhere PPTP client running on CentOS machine, connected to the DC via When I connect to the DC, everything is working fine. I have set up a static IP for the dialup connection in my RRAS server so that the CentOS machine is automatically assigned the IP 192.168.1.240. Inside the VPN, it is not possible to access this machine on the local IP-address. Perfect. However, after several hours, it simply seems to stop working (IE: I cannot ping to or from this machine on the local network). The strange thing is, however: The DC shows the VPN client as still being connected The CentOS machine shows the network interface as being up There are no entries in my /var/log/messages that indicate a problem Output from ifconfig: ppp0 Link encap:Point-to-Point Protocol inet addr:192.168.1.240 P-t-P:192.168.1.160 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1396 Metric:1 RX packets:43 errors:0 dropped:0 overruns:0 frame:0 TX packets:58 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:4511 (4.4 KiB) TX bytes:15071 (14.7 KiB) Output from route -n: 192.168.1.160 0.0.0.0 255.255.255.255 UH 0 0 0 ppp0 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 ppp0 I have the following in my ip-up.local: route add -net 192.168.1.0 netmask 255.255.255.0 dev ppp0 The situation can be easily fixed by issueing a killall pppd and re-connecting. However, I obviously do not want to do this every X-hours or so. I have tried running pppd with both the debug as the kdebug flag but cannot find the cause of this problem. Currently, my ppp0 network interface seems to be running and the last log lines mentioning it are: Feb 19 14:10:40 graviton pppd[10934]: local IP address 192.168.1.240 Feb 19 14:10:40 graviton pppd[10934]: remote IP address 192.168.1.160 Feb 19 14:10:40 graviton pppd[10934]: Script /etc/ppp/ip-up started (pid 10952) Feb 19 14:10:40 graviton pppd[10934]: Script /etc/ppp/ip-up finished (pid 10952), status = 0x0 Feb 19 14:11:27 graviton pptp[10935]: anon log[decaps_gre:pptp_gre.c:414]: buffering packet 190 (expecting 189, lost or reordered) Feb 19 14:11:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Request received. Feb 19 14:11:37 graviton pptp[10942]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 6 'Echo-Reply' Feb 19 14:12:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Request received. Feb 19 14:12:37 graviton pptp[10942]: anon log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 6 'Echo-Reply' Feb 19 14:12:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:13:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:14:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:15:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:16:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:19:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:677]: Echo Reply received. Feb 19 14:19:37 graviton pptp[10942]: anon log[logecho:pptp_ctrl.c:679]: no more Echo Reply/Request packets will be reported. I have enabled the persist option. The network interface is still running, but it is still impossible to send data through the VPN. Any help is appreciated.

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• Problem with switch dell 6224

  - by Matias

  Hello, we just have upgraded the firmware of a dell 6224 power connect switch and it won't reload. These are the symptons: - I power up the switch having the serial cable connected to it and the switch outputs nothing. The configuration of the serial console is fine: 9600 bds, etc... In fact, before the upgrade, I was connected to the switch through the very same cable. - Reseting the switch with its reset pinhole does not reset the switch: the power and fan lights powers off while I keep pressed the pinhole, but the switch itself does not resets. - When I connect an UTP cable to one of the switches port, the green lights don't flash, but ''mii-tool eth0'' in my laptop shows there is link!! The only thing I see in the output, different from other upgrades I've done, is this line at the end: Erasing Boot Flash.....^^^^Done. Any help or idea will be more than welcome!! Thanks!! console#show version Image Descriptions image1 : image2 : Images currently available on Flash -------------------------------------------------------------------- unit image1 image2 current-active next-active 1 <none> 3.0.0.8 image2 image2 console#boot system image2 Activating image image2 .. console#update bootcode Update bootcode and reset (Y/N)? Updating boot code ... Extracting boot code from image... Erasing Boot Flash.....^^^^Done.

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• Server 2008 print server down / access denied

  - by johnnyb10

  I have two Server 2008 servers (both running as VMs in VMware). One is a Full Installation, and the other is a Server Core installation. I just installed Print Services on both of them. In Print Management on the Full server, I added the Server Core print server (so now two print servers are listed in Print Management). However, the icon for my Server Core print server has a red, down-pointing arrow (indicating that it is down, I suppose). And when I right-click it and click Add Printer, I get a message saying that access is denied. Can someone tell me how to bring up or check on the status of the Server Core print server. Obviously, I'm somewhat of a noob with this stuff. Thanks in advance...

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• Unable to connect to Adobe Connect

  - by ub3rst4r

  I am having troubles trying to connect my colleges Adobe Connect. I have done the test meeting connection and it will say "Unable to connect". I have tried connecting on 3 other computers and it works with flying colors. I am running Norton 360 on my computer and I also tried it on my other laptop thats also running Norton 360 and it works on that laptop. I also checked my hosts file and that is not the problem because I am able to connect to the server (on port 80) but not the Adobe Connect port (port 1935). The only thing in it is "127.0.0.1 localhost" Here are the details from the log that the test created: Player Version: WIN 11,3,300,271 App-Server returned: code:ok, servers=rtmp://connect.bowvalleycollege.ca:1935/_rtmp://localhost:8506/,rtmpt://connect.bowvalleycollege.ca:443/_rtmp://localhost:8506/ ERROR: FMS Server did not return correctly! Here is my specifications: Windows 7 SP1 x64 Norton 360 v6.3 (latest) It won't connect in Firefox v15, Chrome v19, or IE9 All of my computers are connected through the same router (D-Link DIR-625) Any ideas?

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• Windows user account just for accessing network shares on a Windows 7 machine

  - by Paulo

  I would like my Xbox (Xbmc) to access my Windows 7 shares without having Guest accounts enabled and without using my Administrator account login details. I have tried making it an account called Xbox and this works fine but the Xbox account appears on the login page for Windows. Is there a way to create an account that is purely for accessing shares without it appearing as a user account????

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• Network Logon Issues with Group Policy and Network

  - by bobloki

  I am gravely in need of your help and assistance. We have a problem with our logon and startup to our Windows 7 Enterprise system. We have more than 3000 Windows Desktops situated in roughly 20+ buildings around campus. Almost every computer on campus has the problem that I will be describing. I have spent over one month peering over etl files from Windows Performance Analyzer (A great product) and hundreds of thousands of event logs. I come to you today humbled that I could not figure this out. The problem as simply put our logon times are extremely long. An average first time logon is roughly 2-10 minutes depending on the software installed. All computers are Windows 7, the oldest computers being 5 years old. Startup times on various computers range from good (1-2 minutes) to very bad (5-60). Our second time logons range from 30 seconds to 4 minutes. We have a gigabit connection between each computer on the network. We have 5 domain controllers which also double as our DNS servers. Initial testing led us to believe that this was a software problem. So I spent a few days testing machines only to find inconsistent results from the etl files from xperfview. Each subset of computers on campus had a different subset of software issues, none seeming to interfere with logon just startup. So I started looking at our group policy and located some very interesting event ID’s. Group Policy 1129: The processing of Group Policy failed because of lack of network connectivity to a domain controller. Group Policy 1055: The processing of Group Policy failed. Windows could not resolve the computer name. This could be caused by one of more of the following: a) Name Resolution failure on the current domain controller. b) Active Directory Replication Latency (an account created on another domain controller has not replicated to the current domain controller). NETLOGON 5719 : This computer was not able to set up a secure session with a domain controller in domain OURDOMAIN due to the following: There are currently no logon servers available to service the logon request. This may lead to authentication problems. Make sure that this computer is connected to the network. If the problem persists, please contact your domain administrator. E1kexpress 27: Intel®82567LM-3 Gigabit Network Connection – Network link is disconnected. NetBT 4300 – The driver could not be created. WMI 10 - Event filter with query "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA "Win32_Processor" AND TargetInstance.LoadPercentage 99" could not be reactivated in namespace "//./root/CIMV2" because of error 0x80041003. Events cannot be delivered through this filter until the problem is corrected. More or less with timestamps it becomes apparent that the network maybe the issue. 1:25:57 - Group Policy is trying to discover the domain controller information 1:25:57 - The network link has been disconnected 1:25:58 - The processing of Group Policy failed because of lack of network connectivity to a domain controller. This may be a transient condition. A success message would be generated once the machine gets connected to the domain controller and Group Policy has successfully processed. If you do not see a success message for several hours, then contact your administrator. 1:25:58 - Making LDAP calls to connect and bind to active directory. DC1.ourdomain.edu 1:25:58 - Call failed after 0 milliseconds. 1:25:58 - Forcing rediscovery of domain controller details. 1:25:58 - Group policy failed to discover the domain controller in 1030 milliseconds 1:25:58 - Periodic policy processing failed for computer OURDOMAIN\%name%$ in 1 seconds. 1:25:59 - A network link has been established at 1Gbps at full duplex 1:26:00 - The network link has been disconnected 1:26:02 - NtpClient was unable to set a domain peer to use as a time source because of discovery error. NtpClient will try again in 3473457 minutes and DOUBLE THE REATTEMPT INTERVAL thereafter. 1:26:05 - A network link has been established at 1Gbps at full duplex 1:26:08 - Name resolution for the name %Name% timed out after none of the configured DNS servers responded. 1:26:10 – The TCP/IP NetBIOS Helper service entered the running state. 1:26:11 - The time provider NtpClient is currently receiving valid time data at dc4.ourdomain.edu 1:26:14 – User Logon Notification for Customer Experience Improvement Program 1:26:15 - Group Policy received the notification Logon from Winlogon for session 1. 1:26:15 - Making LDAP calls to connect and bind to Active Directory. dc4.ourdomain.edu 1:26:18 - The LDAP call to connect and bind to Active Directory completed. dc4. ourdomain.edu. The call completed in 2309 milliseconds. 1:26:18 - Group Policy successfully discovered the Domain Controller in 2918 milliseconds. 1:26:18 - Computer details: Computer role : 2 Network name : (Blank) 1:26:18 - The LDAP call to connect and bind to Active Directory completed. dc4.ourdomain.edu. The call completed in 2309 milliseconds. 1:26:18 - Group Policy successfully discovered the Domain Controller in 2918 milliseconds. 1:26:19 - The WinHTTP Web Proxy Auto-Discovery Service service entered the running state. 1:26:46 - The Network Connections service entered the running state. 1:27:10 – Retrieved account information 1:27:10 – The system call to get account information completed. 1:27:10 - Starting policy processing due to network state change for computer OURDOMAIN\%name%$ 1:27:10 – Network state change detected 1:27:10 - Making system call to get account information. 1:27:11 - Making LDAP calls to connect and bind to Active Directory. dc4.ourdomain.edu 1:27:13 - Computer details: Computer role : 2 Network name : ourdomain.edu (Now not blank) 1:27:13 - Group Policy successfully discovered the Domain Controller in 2886 milliseconds. 1:27:13 - The LDAP call to connect and bind to Active Directory completed. dc4.ourdomain.edu The call completed in 2371 milliseconds. 1:27:15 - Estimated network bandwidth on one of the connections: 0 kbps. 1:27:15 - Estimated network bandwidth on one of the connections: 8545 kbps. 1:27:15 - A fast link was detected. The Estimated bandwidth is 8545 kbps. The slow link threshold is 500 kbps. 1:27:17 – Powershell - Engine state is changed from Available to Stopped. 1:27:20 - Completed Group Policy Local Users and Groups Extension Processing in 4539 milliseconds. 1:27:25 - Completed Group Policy Scheduled Tasks Extension Processing in 5210 milliseconds. 1:27:27 - Completed Group Policy Registry Extension Processing in 1529 milliseconds. 1:27:27 - Completed policy processing due to network state change for computer OURDOMAIN\%name%$ in 16 seconds. 1:27:27 – The Group Policy settings for the computer were processed successfully. There were no changes detected since the last successful processing of Group Policy. Any help would be appreciated. Please ask for any relevant information and it will be provided as soon as possible.

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• Configuring VLAN's on two HP procurve switches

  - by pan

  Trying to route a new ISP (Microwave link) from one of my out buildings to my computer room and hence my firewall. Old ISP came direct into firewall. In the outbuilding the Microwave modem connects with cat5 to HP Procurve 2524 switch. Because this ISP is coming through my internal network, I plan on using a new vlan called "airspeed" only for this ISP traffic. Up until now I've just been using the Default_vlan on both HP switches (4108 + 2524). So far I've been unable to ping from my laptop to the ISP modem both of which are on the new vlan 2 ("Airspeed"). No traffic needs to cross from vlan 2 to vlan 1 so I've left the ports as untagged. I've used the subnet provide from my ISP as the new vlan 2 subnet. Can anybody see what I'm doing wrong here? I've added the configuration of both switch below. Rough diagram: Microwave modem (Gateway IP 77.75.00.49) | HP 2524 switch (port 24) | HP 2524 switch fibre link | HP 4108GL switch fibre link | HP 4108GL switch (port D1) | Laptop configured with IP 77.75.00.50 (for testing but will be connected to firewall) And my 4108GL config: ; J4865A Configuration Editor; Created on release #G.07.21 hostname "HP ProCurve Switch 4108GL" cdp run module 1 type J4864A module 2 type J4862B module 3 type J4862B module 4 type J4862B ip default-gateway 128.1.146.50 snmp-server community "public" Unrestricted snmp-server host 128.1.146.51 "public" Not-INFO snmp-server host 128.1.146.38 "public" vlan 1 name "DEFAULT_VLAN" untagged A1-A3,B1-B24,C1-C24,D2-D24 ip address 128.1.146.203 255.255.0.0 no untagged D1 exit vlan 2 name "Airspeed" untagged D1 ip address 77.75.00.51 255.255.255.248 exit Finally my 2524 config: ; J4813A Configuration Editor; Created on release #F.04.08 hostname "HP ProCurve Switch 2524" cdp run ip default-gateway 0.0.0.0 snmp-server community "public" Unrestricted snmp-server host 128.1.146.51 "public" Not-INFO snmp-server host 128.1.146.51 "public" snmp-server host 128.1.146.38 "public" vlan 1 name "DEFAULT_VLAN" untagged 1-23,25-26 no untagged 24 ip address 128.1.146.204 255.255.0.0 exit vlan 2 name "Airspeed" untagged 24 ip address 77.75.00.51 255.255.255.248 exit no aaa port-access authenticator active

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• Multi-Boot through IPMI possible?

  - by yoursort

  Hi, I want to setup a cluster. On each machine Windows XP and Linux should be installed and the OS should be selectable by a boat loader (e.g. grub). All machines have IPMI cards. Is it possible when starting the machines over IPMI to also select the OS to boot? And how? Thanks!

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• How do I connect two computers with a LAN cable?

  - by John

  I have two machines - Windows XP and a laptop using Windows 7. I connected them with a WLAN cable. On the Windows XP machine, I set the IP address to 192.168.0.10. On the Windows 7 laptop, I set the IP address to 192.168.0.20. The laptop can see the Windows XP machine, but Windows XP machine cannot see the Windows 7 machine. But this does NOT concern me. I want to move the files from my desktop (Windows XP) to Windows 7 (laptop). That's why I'm going through all this. The problem is that when I try to connect from Windows 7 to Windows XP machine, I get this window: I don't understand what username/password is needed. I use none on the Windows XP machine. I tried all usernames - no success. Please explain in deep details how to solve my problem so I can connect to my Windows XP machine. EDIT: Maybe this can help: the Windows XP machine is named 'I' and '???????? III' is the name of the laptop. Both computers share one workgroup - WORKGROUP.

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• connect two ESX hosts on private LAN

  - by maruti

  can a PC setup as W2K3 DC manage two ESX hosts connected to physical hub/switch? Services: DNS, DHCP, Domain distributed to host using a hub/switch. NIC2 on each host connected to switch/hub...spanning a virtual network inside each ESX host

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• Cannot connect to local network shares when connected to VPN. Error: "the user name could not be found"

  - by Nick G

  I keep finding that on our small company LAN (7 users, 3 servers) that some servers keep becoming "not accessible" for the purposes of file sharing. They display the message "\SERVER is not accessible. You might not have permission to use this network resource. The user name could not be found". But I don't know why "the user name could not be found" as all the machines are on the same domain and the PDC and BDC seem to be behaving OK. EDIT: VPN seems to be the cause: It turns out I can see the server if I use the IP address (\\1.2.3.4\ etc) or the FQ active directory name (eg \server.domainname.local) but not if I use the server name on its own or a mapped network drive originally created from the "short" name. Oddly though, my machine has no issue resolving the server's DNS name as I can ping the machine name OK and it immediately comes back with the IP, however nslookup seems to fail. It seems to be a problem with how Windows looks up machine names when connected to VPNs. When I'm connected to a VPN, windows seems to use the DNS assocated with the VPN and not the one on the domain controller. This behavior to me, seems incorrect as surely that would mean connecting to any VPN would break any ability to lookup local machine names for servers and printers etc. So I guess the real question now is, how can I make my machine still search the local Active Directory DNS (the PDC) even when connected to a VPN? More info in my comments below.

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• Set iDRAC IP Address on Ubuntu 12.04 without Reboot?

  - by BT643

  We have a Dell PowerEdge R720XD server and want to setup iDRAC, but this is a production server so we need to do it without a reboot if possible. We just need to set the IP address on the iDRAC but the servers do not have a front LCD panel so we cannot use this. The iDRAC will currently have the default 192.168.0.120 IP address but we are not on this IP range so cannot use this. We need to change it to 192.168.5.x. I've seen racadm mentioned, but before I start messing around installing this on Ubuntu, is this what we need? and will we be able to set the IP address on the DRAC with this? Thanks

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• VirtualBox guest responds to ping but all ports closed in nmap

  - by jeremyjjbrown

  I want to setup a test database on a vm for development purposes but I cannot connect to the server via the network. I've got Ubuntu 12.04vm installed on 12.04 host in Virtualbox 4.2.4 set to - Bridged network mode - Promiscuous Allow All When I try to ping the virtual guest from any network client I get the expected result. PING 192.168.1.209 (192.168.1.209) 56(84) bytes of data. 64 bytes from 192.168.1.209: icmp_req=1 ttl=64 time=0.427 ms ... Internet access inside the vm is normal But when I nmap it I get nothin! jeremy@bangkok:~$ nmap -sV -p 1-65535 192.168.1.209 Starting Nmap 5.21 ( http://nmap.org ) at 2012-11-15 18:39 CST Nmap scan report for jeremy (192.168.1.209) Host is up (0.0032s latency). All 65535 scanned ports on jeremy (192.168.1.209) are closed Service detection performed. Please report any incorrect results at http://nmap.org/submit/ Nmap done: 1 IP address (1 host up) scanned in 0.88 seconds ufw and iptables on VM... jeremy@jeremy:~$ sudo service ufw stop [sudo] password for jeremy: ufw stop/waiting jeremy@jeremy:~$ sudo iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination I have scanned around and have no reason to believe that my router is blocking internal ports. jeremy@bangkok:~$ nmap -v 192.168.1.2 Starting Nmap 5.21 ( http://nmap.org ) at 2012-11-15 18:44 CST Initiating Ping Scan at 18:44 Scanning 192.168.1.2 [2 ports] Completed Ping Scan at 18:44, 0.00s elapsed (1 total hosts) Initiating Parallel DNS resolution of 1 host. at 18:44 Completed Parallel DNS resolution of 1 host. at 18:44, 0.03s elapsed Initiating Connect Scan at 18:44 Scanning 192.168.1.2 [1000 ports] Discovered open port 445/tcp on 192.168.1.2 Discovered open port 139/tcp on 192.168.1.2 Discovered open port 3306/tcp on 192.168.1.2 Discovered open port 80/tcp on 192.168.1.2 Discovered open port 111/tcp on 192.168.1.2 Discovered open port 53/tcp on 192.168.1.2 Discovered open port 5902/tcp on 192.168.1.2 Discovered open port 8090/tcp on 192.168.1.2 Discovered open port 6881/tcp on 192.168.1.2 Completed Connect Scan at 18:44, 0.02s elapsed (1000 total ports) Nmap scan report for 192.168.1.2 Host is up (0.0017s latency). Not shown: 991 closed ports PORT STATE SERVICE 53/tcp open domain 80/tcp open http 111/tcp open rpcbind 139/tcp open netbios-ssn 445/tcp open microsoft-ds 3306/tcp open mysql 5902/tcp open vnc-2 6881/tcp open bittorrent-tracker 8090/tcp open unknown Read data files from: /usr/share/nmap Nmap done: 1 IP address (1 host up) scanned in 0.08 seconds Answer... Turns out all of the ports were open to the network. I installed open ssh and confirmed it. Then I edited my db conf to listen to external IP's and all was well.

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• Zabbix Server with Multiple NIC (one on different VLAN) - Monitor a host from both NIC?

  - by Joshua Enfield

  Basically we have many of servers configured for internal use only. I want to ensure the internal services are preserved as internal by checking a host using the local subnet (allowed - this checks if services are up and working), and that the internal services are indeed internal (make sure the services are "down" when checking from different subnet (vlan)) Is there an easy way to do this in Zabbix?

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• How to fix network connection dead on startup, but okay after disable/enable?

  - by bill weaver

  on Startup When my system starts up, the internet connection is dead. This causes various problems with startup items such as updates and auto-start programs failing. However, the connection is fine after going into Network and Sharing, Change adapter settings, then disabling and re-enabling the adapter. Any suggestions on why this is happening and how to fix it? System summary: Windows 7, 64 bit, Realtek PCIe GBE Family Controller, Linksys WRT610N router, Sci Atlanta cable modem.

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• Why did MAC-Adress Cloning Fix My Router?

  - by FranticPedantic

  I have a Belkin router, and about a year ago, I suddenly lost my internet connectivity from Comcast. The internet worked fine when I plugged it right into my laptop, so I just ignored it. When I moved to another apartmnet I eventually took the dive and called tech support. The tech told me to clone my MAC address which completely fixed the issue. Now I know what a MAC address is and I've read what MAC cloning is. What has bothered me since is that I don't see how this fixed the issue. As I have understood MAC address cloning, it has the router pretend it has the same MAC address as my computer. Here is why I don't understand why this fixes my issue: I have used several different computers with this router. Cloning the MAC address fixed it for ALL of my computers. The laptop I first used with my ISP was not the one that I eventually had connected when I cloned the address. Furthermore, I didn't have any problems for quite some time after I stopped using the first computer. It wasn't like the internet suddenly stopped working when I changed which laptop I was using Now it occurred to me that maybe there was some sort of expiration? Except... Which MAC address did it clone? It was just an option in the router administration page. Did it just pick whichever computer was connected to it? If my ISP still wanted the MAC of my first computer, how did some other computer's fix it? As mentioned earlier, why did this problem seemingly stem from nowhere? Anyway, I don't have any current problems so this is more just out of general curiosity. If anybody can explain it, it would be appreciated!

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• Changing subnet-mask of class-c network host to 255.255.0.0

  - by Prashant Mandhare

  We have a existing class-c network with IP address range 11.22.33.44/24 (just for example). My domain controller has been configured within this subnet. So all servers within this subnet have subnet mask configured to 255.255.255.0. Now we have got a new subnet with IP address 11.22.88.99/24 (note that only last 2 octets have changed). I want all new hosts in this new subnet to join my existing DC. For this we have configured firewall properly so allow this. (so there is no issue with firewall). But initially I was not able to join hosts in new subnet in existing domain. Later I doubted on subnet mask used in domain controller (255.255.255.0) and for testing purpose I changed it to 255.255.0.0, it worked like charm, i was able to join subnet-2 hosts in subnet-1 domain. Now i am wondering whether it will be good practice to change subnet mask of a class-c network to 255.255.0.0? Can any issues arise due to this? Experts please provide your opinion.

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• Best free (or cheap) ASP.NET based CMS for a club/association?

  - by marc_s

  I've been looking for a simple, intuitive ASP.NET based CMS to handle my club/association site. It should be based on ASP.NET so I can add some extra specific pages offer a membership system, e.g. I want to be able to define members which can e.g. comment posts, while anonymous users can only read (no active participation) have features like news, forums, blogs, picture gallery be simple and easy to use I've been looking at GraffitiCMS: so far my favorite, but it has no forum, and no membership system, and no future, it seems - no development whatsoever in over a year :-( Sitefinity: had extreme trouble even getting it installed, and when it's finally up and running, I find it overly complicated and not intuitive at all Umbraco: same problem - hard to install, hard to get up and running, the intro videos on their site are only available to paying subscribers (what's up with that deal???)..... DotNetNuke: seems like a major overkill Community Server: seems like a major overkill - and seems to be more and more commercial, only Any others I've missed that I should have definitely looked at ??

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• Reloading NAT configuration on a running VMWare Server 2.0.2

  - by Jonathan Clarke

  I have a server running VMWare Server 2.0.2. The host is Debian Lenny. I have 15-20 virtual machines running, all attached to a single NAT network (named vmnet8). I have configured VMWare's NAT (the vmnet-natd daemon) to forward some incoming to ports to one of the VMs, since it hosts some publicly accessible services. I did this via the file /etc/vmware/vmnet8/nat/nat.conf by adding lines like the following: 80 = 192.168.100.100:80 This works great, I can reach the web server on the VM at 192.168.100.100 by connecting to the host's IP address. Sometimes, I need to add port redirections to this NAT configuration. So, I add a line to the configuration file. Now for the question. How do I make the natd process take this new configuration into account? Clearly, restarting the host machine does take it into account, and the newly added port is forwarded. However, this is not an option on this server, so how should one do this without restarting the whole host? Thanks for any ideas!

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• Check packet vlan tag using Tap virtual interface

  - by ankit

  Hi all, I am trying to learn how to implement virtual interfaces using the Tap driver. So far my understanding is that using the tap driver I can create a virtual interface and then have a userspace program attach to this interface to analyse the data coming into this device. Now what if I attach a cisco switch to my LAN interface using a TRUNK link, forward all the packets coming into the LAN interface to the virtual tap interface and then in my program attached to this interface do some coding to analyze the vlan tag in the packet and only allow certain vlans to be forwarded to the WAN interface ? Does this sound plausible or is there is flaw in my basic understanding ? Thanks for the help! ankit

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• How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• how to connect to wampserver from the other computer

  - by user28233

  I have two computers. with both windows 7 as os. One pc has wampserver installed how do I connect them so that the other one can access the database that is in the other pc. I have a hub that connects both physically but how do I set it up in the os?

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• Cisco 837 not passing UDP traffic properly (was: DNS query problem)

  - by TessellatingHeckler

  We have a setup of ADSL line - Cisco 837 ADSL router - Zyxel ZyWall 35 firewall/NAT - Switch - LAN. It has been fine for years, suddenly DNS resolution stopped working from the LAN to public DNS servers. No changes that I know of, so I can't revert anything. Current behaviour: DNS requests from the LAN using TCP show up in the oubound firewall log, in the Cisco debug log, in the dns-server-firewall, in tcpdump on the DNS server, the answer comes back, it works fine. DNS requests from the LAN using UDP show up in the outbound firewall log, in the Cisco debug log, but does NOT show in the dns-server-firewall, not in tcpdump on the DNS server, times out. DNS requests from the Cisco using UDP show up in the dns-server-firewall and in tcpdump on the DNS server, answer received, works fine. netcat connections to port 53 or a random port by TCP show up in the dns-server-firewall netcat connections to port 53 or a random port by UDP do not show up in the dns-server-firewall Summary: TCP seems fine throughought. UDP works from the Cisco over the ADSL, and it works from the LAN to the Cisco, but it doesn't seem to cross the Cisco 837 properly. Update: confirmed with netcat that any UDP traffic from the LAN is affected, not just traffic to port 53. Update: If I change the firewall's external IP to any other IP in the subnet, this starts working. When I put it back, it stops working. I now suspect it's an ISP issue (does that sound plausible?), and am removing the Cisco config.

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• ip namespace non-root shell

  - by user2730940

  I am trying to run ssh command to another ip namespace. I can do it right now, but it runs as root. I want to run it as a normal user. I want to know if there is a way to enter a non-root shell in another network namespace. I know you can use this to enter a root shell in another namespace: sudo ip netns exec <namespace> bash Alternatively, is there a way to run single commands as a non-root user? I know you can run commands as root with this: sudo ip netns exec <namespace> <command>

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• Filtering SNMP View

  - by Arie K

  We have several network interfaces in a machine. How to configure SNMP view to limit which interfaces could be shown to public community? We're using Ubuntu Server and default SNMPD from the repository. We have successfully limit the SNMPD agent to show only interfaces tree using this configuration: view system included .iso.org.dod.internet.mgmt.mib-2.interfaces

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