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• VoIP on Netgear DGN 2000 and Lynksys PAP2

  - by David Brown

  I have a VoIP service running perfectly for outgoing calls but I cannot receive incoming calls. I have a Netgear DGN 2000 modem router on 192.168.0.1 and a Lynksys Phone Adapter PAP2 on 192.168.0.2. I have created 3 new custom services: Service Table Service Name Ports tlenfon(TCP) 5060 tlenfon2(UDP) 15000 tlenfon3(UDP) 35000 I have reserved the address 192.168.0.2 for the PAP 2 I have forwarded the ports for each service to the PAP2 Service Name Action LAN Server IP address WAN Users Log tlenfon ALLOW always 192.168.0.2 Any Always tlenfon2 ALLOW always 192.168.0.2 Any Always tlenfon3 ALLOW always 192.168.0.2 Any Always I have checked the Default DMZ and specified 192.168.0.2 What have I missed?

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• NATing with a single-homed machine possible?

  - by Harry

  I have the following setup: a) a single-homed machine, A, that can see the Internet. b) other machines B, C, and D that cannot see the Internet. c) A, B, C, and D can see each other. d) all machines are running either RHEL 5.3 or Fedora 16. Question: Is it possible to have B, C, and D share the Internet connection with A somehow? Note, again, that machine A does not have a second NIC installed. (The solutions that I am finding on the Net assume A to be a dual-homed system!) Also, could you please recommend a set of book(s) or online resources for a current and in-depth coverage of iptables for people with only a basic knowledge of TCP/IP?

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• postgresql 9.1 Multiple Cluster on same host

  - by user1272305

  I have 2 cluster databases, running on the same host, Ubuntu. My fist database port is set to default but my second database port is set to 5433 in the postgresql.conf file. While everything is ok with local connections, I cannot connect using any of my tools to the second database with port 5433, including pgAdmin. Please help. Any parameter that I need to modify for the new database with port 5433? netstat -an | grep 5433 shows, tcp 0 0 0.0.0.0:5433 0.0.0.0:* LISTEN tcp6 0 0 :::5433 :::* LISTEN unix 2 [ ACC ] STREAM LISTENING 72842 /var/run/postgresql/.s.PGSQL.5433 iptables -L shows, 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

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• Changing Internet connection on ISA Server 2000

  - by garyb32234234

  Hi We are getting a new internet connection installed and will need to unplug the old one and connect this to our ISA Server 2000. Will this be a simple swap out job? We will be given a new ip, which i know i will have to enter into the external network card TCP/IP page. I will also be given the default gateway to enter. The ISP engineer said we may have to reset the ARP? cache, if we dont know how we will have to reset the ISA server? Has anyone any experience? The current connection is with the same ISP but it was owned by the business park were we are located and they linked up an ethernet port to what i assume is their own router. Hope you can help, i know that ISA 2000 is somewhat less easy to use than the newer versions.

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• Snow Leopard crashes my Xerox printer

  - by Ho Li Cow

  Just set up 2 brand new iMac 21.5" with OS X 10.6.2 pre-installed in our office. Now whenever we try to print an e-mail out, it re-sets the printer i.e. it switches off, does a POST and prints out a Printer Config page. I can print web pages and from other apps fine, just Apple Mail seems to be suffering. Printer is a Xerox Phaser 7750. I downloaded the drivers it recommended when i first tried printing which didn't help and then also tried downloading from the Xerox site. The latter seemed to install fine but then right at the end, it would say 'Installation Successful', then ask me to choose a printer (it found it fine, both by Bonjour and Raw TCP - i tried both) and then it would give an error message. Any help appreciated.

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• check_ssh executed from Nagios server returns "Server answer: ", nothing else

  - by phs

  Commmand works on the host I need to monitor (its IP is denoted as $HOSTADDRESS$ here): [root@host ~]# /usr/local/nagios/libexec/check_ssh localhost SSH OK - OpenSSH_4.3 (protocol 2.0) However, on the Nagios server, it does not: root@server:~# /usr/lib/nagios/plugins/check_ssh -H $HOSTADDRESS$ Server answer: I can see that the port is open: root@server:~# /usr/lib/nagios/plugins/check_tcp -H $HOSTADDRESS$ -p 22 TCP OK - 0.123 second response time on port 22|time=0.123277s;;;0.000000;10.000000 And I can verify with telnet: root@server:/etc/nagios3/conf.d# telnet $HOSTADDRESS$ 22 Trying $HOSTADDRESS$... Connected to $HOSTADDRESS$. Escape character is '^]'. After searching the web for two hours and trying different suggestions I am out of ideas. I have several other hosts with similar setup, and they don't have this problem. I have compared the configs and they look the same (I think). I am clearly missing something here.

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• Can't access internet even though everything is working

  - by entity64

  A friend recently upgraded to a new cable internet connection. The modem connects to the router and various PCs and smartphones from her roommates connect to the router. They don't have any problem accessing the internet. She has Windows 8 and can't access any website (via wifi and ethernet). DNS (UDP) is working, DHCP set up everything correctly, Wifi is working, Trace routes and Pings (ICMP) go through with no problem at all. But neither Dropbox nor Skype nor Spotify nor any browser (all TCP) can access any website. The thing is though, she can connect through the university wifi and via a neighbors wifi. It's just her home connection. No firewalls are running and the computer is clean - no malware. How could it be that only her home connection won't work and others do?

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• Airpot Express configuration

  - by Christina

  We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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• Ping myself, works with ipv6 not ipv4 in Windows 7

  - by user68546

  Hi! I've tried to solve the following problem with no luck and I need some proffesional help. The following is possible: Ping all computers (that I tried) in the domain without problem. Ping myself with localhost which use ::1. Ping myself with my given ipv6 IP. Internet access. The following is not possible: Noone can ping me (request timeout) with computername/ipv4/ipv6. I cannot ping myself with my given ipv4 IP or 127.0.0.1 (request timeout). Tried to enable/disable TCP/IPv4. Same issue. Turned off windows firewall. Added an inbound rule to allow icmp (just in case). Same same.. Is there someone out there that has any idea what the issue could be? Any help would be most appreciated!

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• No internet connection for some programmes after installing ad hoc wireless network

  - by Michael

  After installing a wireless network (through the program iPhoneModem) several programmes have stopped working when connected to the Internet using another wireless connection. Working programmes: Firefox (browser) uTorrent (p2p) FileZilla (ftp) etc. Programmes that are not working: Chrome (browser) Digsby (IM client) etc. I'm running Windows 7. I have tried to disable Windows Firewall entirely as well as AVG anti virus, with no effect. I've tried to run the FixIt program from Microsoft adressing a corrupt TCP/IP stack. This too had no effect. Any suggestions?

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• Using iptables to block ALL outgoing traffic from one NIC?

  - by edanfalls

  Hi, I must pretty bad at Googling as this seems like a very basic question but I can't seem to find the answer anywhere... and man iptables is a very long read! I have two NICs - eth0 and eth1 - on a linux box and I want to block ALL outbound traffic (TCP and UDP across all ports) from one of the NICs, so that no traffic makes its way back up to the router. What is the command for this? I have only seen examples with specific ports. Thanks in advance.

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• Rejecting new HTTP requests when server reaches a certain throughput

  - by Sam

  I have a requirement to run an HTTP server that rejects new HTTP requests (with a 503, or similar) when the global transfer rate of current HTTP responses exceeds a certain level. For example, if the web server is transferring at 98Mbps, and a new HTTP request arrives, we would want to reject this (as we couldn't guarantee a good speed). I've had a look at mod_cband for Apache, limit_req for nginx, and lighttpd's rate limiting features, but none of them seem to handle my (rather contrived, granted) use case. I should add that I'm open to using pretty much any web server, and am open to implementing this in iptables rules if someone can craft such a rule! (Refusing the TCP connection is fine, it doesn't have to respond with an HTTP 503). Any suggestions?

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• Unable to do Port Forwarding in Virtual Box

  - by dewbot

  I'm using Mac OS X 10.6. I have installed Virtual Box 4.1.0 in it. My Guest OS is Ubuntu Server 11.04. I have added a rule in Port Forwarding in Virtual Box - "guestssh" TCP 127.0.1.1 8080 127.0.0.1 1337 Inside Guest OS I'm running nodejs server. Code is nothing but simple helloworld code found on their site http://nodejs.org/. In short I'm running server on 127.0.0.1 on 1337 Port. Now according to rule I have given, from Host Machine all the requests for 127.0.1.1:8080 should be forwarded to 127.0.0.1:1337 of Guest OS. From Host I'm doing curl http://127.0.1.1:8080 and I'm getting curl: (7) couldn't connect to host Is there something am I doing wrong? Note- Don't give me suggestion to do ssh n all. As my ISP does not provide Internal LAN so its not possible in my case. All I can do it Port Forwarding.

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• Internet wireless connected with limited access, windows vista

  - by Wawa wiya

  Hello I had some malware in my computer so I did a bit of manual work to remove it including resetting TCP/IP. Now the malware is gone. I can see my home wireless network and I can get connected to it but when connected I get the Internet wireless connected with limited access message. When I go to the IE I cannot browse. When I tried to ping 192.168.1.1 I got an Error Code 1231 Unconnected Network Problem. I have deactivated my Windows firewall as I thought it could be hyperactive security. Still no luck. I have Norton but it is not active, I have also Avast and AVG installed but they are not active. Any ideas?

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• Automatically send a string when opening a raw connection in putty

  - by MBraedley

  I have a program running on a server that accepts TCP/IP connections on a specified port. When a connection is made, this program waits for the user (i.e. me) to send a string which identifies the type of user. Once the user identifies themselves, the program will start sending data that is relevant to that user type. I want to automate the first step and have putty automatically send the user identification string once the connection is made. I've been through the settings, and can't seem to find anything like "send following commands on connection". Any help would be appreciated.

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• Network Block Device (NBD) clients for Windows or similar solutions

  - by przemoc

  Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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• Where would an S3 upload speed cap originate?

  - by CoreyH

  I do a ton of uploading to S3 and am experiencing capped speeds and I can't quite figure out how to address it. The setup: Windows Server 2008 R2 x64, external HD, using a Java based upload tool called Jsh3ll and custom VBS scripts to kick the jobs off. Running one process at a time, I am always limited to about 4mbps. I have FiOS at 35/35mbps speeds, so it isn't an outright limit. AND, I can run parallel instances and can go all the way up to 35mbps, so I know the problem isn't gateway/nic/machine/amazon related. Running parallel instances works to a degree as a solution, but increases the complexity of my workflow greatly. Solving this would make my life dramatically easier. When I was first doing this I was playing around with a bunch of Windows TCP parameters and was able to briefly get unconstrained bandwidth, but it wasn't repeatable. Thoughts?

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• What are good and bad jitter times for a LAN

  - by garyb32234234

  Ive just ran jperf (frontend to iperf) on our network between 2 workstations, its recorded jitter between 0.033ms and 0.048ms. Is this good or bad? Are there more variables that i would need to consider to make the decision? EDIT: TCP/IP Ethernet LAN 43 PCs 1 server, 100Mbits main switch, various small 8 port switches, test was done using UDP, Its a Windows Domain. I want to instal a few voip softphones on the workstations, see how many i can use that reliably work, im testing a few different workstations around the network to see where the best quality network paths are. Will also change some equipment if i identify bad connections.

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• SQL connection is too slow

  - by user66905

  We have a business web application in ASP.NET + SQL Server 2008. In the beginning, SQL Server and IIS were on the same machine. Now we bought another machine. Current configuration is IIS machine plus SQL Server machine, and they are connected by a 1gb LAN connection. With this configuration our web application is slower than before. Max bandwidth is 1-2% of network, about 15mbps. When we use another threads to the same SQL Server from the same IIS machine, network use is higher. So this is no problem with SQL Server. Ho we can make higher bandwidth for this SQL connection? Specs: .Net 3.5 SQL Server 2008 Standard file transfer can use 100% of LAN SQL connection by TCP/IP protocol SQL logins Pool tested with enable and

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• IP not detected in terremark enteprise cloud server - how to install VMware on instance?

  - by JohnMerlino

  Using terremark enteprise cloud, when you create a server, you assigned an IP address to them and that IP is visible under Detected IP when selecting the server. However, I created a server, with IP address and I created an internet service and connected it with a node. I used protocol TCP and mapped it to port 3001. But I notice when I select my server, the IP address doesnt dsplay under Detected IP and then I VPN Connect, launch terminal and try to SSH with the IP to my server, and I get connection timed out. I presume the reason lies in that the IP address is not being detected. Someone suggested that my VMware-Tools is out of date and in fact on the server instance for VMware-Tools it does say "out of date". I'm not sure how to mount the instance and install VMware-Tools. I am using Mac OSX. Someone said that it will only work on PC running IE.

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• How do I get rid of sockets in FIN_WAIT1 state?

  - by Gert M

  I have a port that is blocked by a process I needed to kill. (a little telnet daemon that crashed) The process was killed successfully but the port is still in a 'FIN_WAIT1' state. It doesn't come out of it, the timeout for that seems to be set to 'a decade'. The only way I've found to free the port is to reboot the entire machine, which is ofcourse something I do not want to do. $ netstat -tulnap | grep FIN_WAIT1 tcp 0 13937 10.0.0.153:4000 10.0.2.46:2572 FIN_WAIT1 - Does anyone know how I can get this port unblocked without rebooting?

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• Amazon EC2 Socket connection not being accepted

  - by Joseph

  I am trying to run a java application on my EC2 instance. The application accepts socket connections on port 54321. If I try and connect to it, it times out. My Security Group is set as: TCP Port (Service) Source Action 21 0.0.0.0/0 Delete 22 (SSH) 0.0.0.0/0 Delete 80 (HTTP) 0.0.0.0/0 Delete 20393 0.0.0.0/0 Delete 54321 0.0.0.0/0 Delete Is there anything else I need to do? # iptables -nvL Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination # iptables -nvL -t nat Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination Chain POSTROUTING (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination #

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• Inaccurate bandwidth limiting in altq queues

  - by overkordbaever

  I'm setting up an environment where I have one Linux server, one OpenBSD router and one Linux client and I want to be able to limit how much bandwidth the client should be able to use. I've been performing these tests with "netcat" and "time" (using time to measure the time of the transfer with netcat), and what happens when trying these tests (using the TCP protocol, the queues will for some reason not work with UDP) is that the queues aren't exact at all. For example: when setting a bandwidth limit of 10mbit, the client cannot use more than five mbits, when setting a limit of 100mbit, the client cannot use more than around 50mbit. The config looks like (using a 100mbit limit in the example): #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq(default) #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low

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• MSSQL 2008 is claiming the firewall is blocking ports even from local machine

  - by Mercurybullet

  I was just hoping to step through a couple queries to see how the temp tables are interacting and I'm getting this message. The windows firewall on this machine is currently blocking remote debugging. Remote debugging requires that the debugging be allowed to receive information from the network.Remote debugging also requires DCOM (TCP port 135) and IPSEC (UDP 4500/UDP500) be unblocked Even when I walked over to the actual machine and tried running the debugger, I'm still getting the same message. Am I missing something or does the debugger try to run remotely even from the local machine? Since this was meant to be just a quick check, I don't need instructions on how to open up the firewall, just hoping there is a way to run the debugger locally instead.

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• IPP Printing from Windows 7 Ultimate

  - by Casey

  I have network IPP working on Ubuntu and Windows XP. On my Windows 7 instance, it refuses to acknowledge the remote server connection. Can anyone suggest how to configure this correctly? My install steps are: Add Printer Add a Local Printer Create a New Port and "Standard TCP/IP Port" Enter hostname http://host:631/printers/Printer_Name After that it says the printer is not detected, asks me to pick a driver, and finish up. Trying to use the device does not produce any output? If anyone has got this work, I would really appreciate a fix.

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