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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• Asterisk doesn't start properly at system startup. DNS lookup fails.

  - by leiflundgren

  When I start my Ubuntu system it attempts two DNS lookups. One to find out what my internet-routers external ip is. And one to find the IP of my PSTN-SIP-provider. Both fails. [Apr 7 22:14:54] WARNING[1675] chan_sip.c: Invalid address for externhost keyword: sip.mydomain.com ... [Apr 7 22:14:54] WARNING[1675] acl.c: Unable to lookup 'sip.myprovider.com' And since the DNS fails it cannot register properly a cannot make outgoing or incoming calls. If I later, after bootup, restart asterisk everything works excelent. Any idea how I should setup things so that either: Delay Asterisk startup so that DNS is up and healthy first. Somehow get Asterisk to re-try the DNS thing later. Regards Leif

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• Server problem (duh)

  - by j-t-s

  Sorry the title couldn't be more specific. I installed Abyss Web Server. I'm running Windows XP Home Edition and I have Wireless Mobile Broadband internet. I used to be able to access (and other people on other networks) my site by entering my ip address in the browser, but after I formatted, and the installed abyss web server again, this does not work anymore. There are no errors. I CAN visit my own site by entering my ip address BUT anybody else can't do the same, it just says "connecting" in the browser's statusbar and it never changes. I have consulted the docs and have found no help. Google hasn't helped with this problem either. Can somebody please help? Thank you :)

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• ASP.NET MVC hosting recommendations

  - by chris

  I'm looking for recommendations for hosting an asp.net MVC application. Obviously, we need to be able to have access to configure IIS directly - I'd prefer not to have to go thru a control panel. The web server needs to have a dedicated IP, since some clients will be accessing it via IP. We need at least a SQLServer 2005 database, ideally on the same box. Load and usage will be pretty low, so a virtual machine will probably be fine. Does any one have any recommendations that meet the above constraints?

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• How to port forward https traffic via ssh and/or remote desktop to through several networks and PCs?

  - by donttellya

  I have the following environment: In company X I develop a application on a pc A in network A with ip address 192.168.100.50 which has to do an https request to an http server located in the intranet of company Y In company X is another pc B in network B with ip address 192.168.200.100 pc B (of company X) can access the intranet from company Y via ssh tunnel (putty) pc A (of company X) can ping pc B (of company X) note: pc A can also do a remote desktop connection to pc B) pc B can ping the http sever pc A can not ping the http server How can the https request from pc A of company X get to the http server of company Y? On which pc must be putty configured? And which settings for host, port forwarding etc. has to be done in putty? So finally the https request should go from PC A - PC B - Http Server in company Y.

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• Apache Virtual Host Configuration

  - by Carl

  I have been searching the internet for an hour now, and I was hoping for a quick hint here so that I could solve my problem a wee bit faster. My virtual server is so far only accessible through an IP address, no DNS entry yet, and so far none needed either. The problem I have is with Apache2, the virtual hosts are puzzling me. What I need is: Access to my project (based on Symfony2) from the outside with the IP address Access to my project from localhost What I have got: Access from the outside results in rendering the websites in /var/www/vhosts/htdocs/default, while from the inside results in rendering the websites in /var/www. Why the difference? What is a recommended configuration for my use case?

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• Is it safe to use a single switch for multiple subnets?

  - by George Bailey

  For a moment, forget about whether the following is typical or easy to explain, is it safe and sound? Internet | ISP supplied router x.x.x.1 (public subnet) | switch-------------------------------------+ | (public subnet) | (public subnet) BVI router (switch with an access list) NAT router | (public subnet) | (private subnet 192.168.50.1) +--------------------------------switch----+ (both subnets) | | computer with IP 192.168.50.2 ------+ +----computer with IP x.x.x.2 I don't plan to implement this setup, but I am curious about it. The 50.2 computer may send a packet to the x.2 computer, but it will use 50.1 as the router, since 50.2 knows that the subnet is different. Would this result in the packet being received twice by the x.2 machine, first directly through the switch, second by way of the two routers? Do you see any problems with this aside from how confusing it is, and that it would put one switch doing the work of two subnets?

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• vmware workstation - virtual network adapters missing from ipconfig, still show in networking (XP host)

  - by Adam

  Hi Folks - here's a new one for me, and my first time posting here: I installed VMWare workstation 7.1 on a new PC. VMWare properly installs the virtual network adapters under the Network Connections control panel, however for some reason they do not show up under ipconfig, which is very weird. They also don't appear anywhere in "route print". I don't have network connectivity to the VM. My guesses are perhaps some conflict with Symantec AntiVirus or Symantec Client Firewall. Tried the following things: enabling TCP/IP in the virtual network adapters (they often get installed with it disabled for some reason) Restoring defualts in the VMnetcfg gui tool (this causes an uninstall and reinstall of the virtual network adapters on the host) Re-installing vmware workstation Uninstalling checkpoint secureremote and then reinstalling vmware Just to be clear, this problem is totally on the host. In my searching for stuff about (non-vmware) adapters missing from ipconfig, I see some posts about resetting the TCP/IP stack using netsh. Looking into that next... Thanks!

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• How to detect device type from device connected to router?

  - by molly

  I have a att router and there is an unknown device connected to my network. I can't seem to kick it off because of how att's router settings are created which is kind of dumb. I am able to see its local ip and mac address. I am on a mac with snow leopard. How can I get more information on the device with the information that I have? I want to see what kind of device it is, I have checked all devices that are connected to the router and none seem to match the local ip that is connected. I have WPA encryption setup with a strong password.

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• I want to start my portfolio site using ASP.Net and I'm a bit lost about hwo to actually put it on t

  - by Papuccino1

  I found this site: www.discountasp.net They seem cheap enough and have a track record. I decided to host my site with them. Here's where I'm confused. I host the application (my website) with them and they give me an IP address, right? Users can visit my site by typing in that IP address right? (Of course once I move the index file and create a defauly web folder, etc.) Next step is buying a domain name right? Like www.mysite.com, right? Is this the way it's done, or am I doing it wrong?

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• Setting up Multiple Routers (as Hardware Firewalls) behind a Home Router

  - by Synetech

  I’ve currently got one computer behind a router with built-in firewall functionality, connected to a home cable-modem that has a single Ethernet port and one IP. I’m going to have to set up another computer for the rest of the family to use which of course will need to be connected to the Internet, probably wirelessly since the modem is in my room and the new system would not be. What I would like to do is to get two more small routers with firewall capability and connect each computer to a router, which would in turn connect to the main router which connects to the cable-modem. That way, both systems have a hardware firewall protecting them (particularly the wireless system) and the burden of blocking would be reduced on both the computer CPUs and the main router because the secondary routers would handle some of the workload. I’m trying to find out about the complexities inherent in this design and how I could set it up to work, specifically the IP handling and NAT aspect. Thanks a lot.

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• Laptops trying to connect via wireless? Only able to connect only via wired connection

  - by Chris J. Lee

  It seems that all the wireless laptops in the office have disconnected and are unable to reconnect to the wifi after a terrible storm caused some power interruptions. Troubleshooting actions Verify wireless broadcasting is up With each laptop i ended up flushing their dns cache on Win 7 (ipconfig /flush ) Performed an ipconfig /all to see what the new ip is Made sure password was correct Reset the router (multiple times) restarted each laptop. Tried connecting wirelessly Am i missing some small detail ? Network information The router is a linksys/cisco WRVS4400N router. Supports a lot of fancy features i don't know how to use. We have 3 static ip's the conference room computer, the wireless printer, my computer Mostly windows machines, we have 3 mac users

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• tcp handshake failed.client send rst (after syn-ack). can any one advice?

  - by user1495181

  architecture: 2 linux computer connected . on the second (192.168.1.1) one run apache server . I have a small program that take tcp packets from nfqueue change the dst ip to 192.168.1.1 in case that the dst ip is 192.168.1.2 (i know that i can do it with iptables , but my program will do more things in the future), fix check sum and return to the queue. if i call to telnet 192.168.1.1 , means that my program dosnt need to do any manipulation, handshake is OK. If i call to telnet 192.168.1.2 , my program change the dest. server get the syn and return syn-ack, but right after getting the syn-ack the client send rst. Can anyone advice? wireshark of the telnet tcpdump of the telenet above

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• Configuring Linux Network

  - by Reiler

  Hi I'm working on some software, that runs on a Centos 5.xx installation. I'ts not allowed for our customers to log in to Linux, everything is done from Windows applications, developed by us. So we have build a frontend for the user to configure network setup: Static/DHCP, ip-address, gateway, DNS, Hostname. Right now I let the user enter the information in the Windows app, and then write it on the Linux server like this: Write to /etc/resolv.conf: Nameserver Write to /etc/sysconfig/network: Gateway and Hostname Write to /etc/sysconfig/network-scripts/ifcfg-eth0: Ipaddress, Netmask, Bootproto(DHCP or Static) I also (after some time) found out that I was unable to send mail, unless I wrote in /etc/hosts: 127.0.0.1 Hostname All this seems to work, but is there a better/easier way to do this? Also, I read the network configuration nearly the same way, but if I use DHCP, I miss som information, for instance the Ip-address. I know that I can get some information from the commandline (ifconfig), but I dont get for instance Hostname, Gateway and DNS. Is there a commandline tool that will display this?

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• netmask: command not found

  - by Ian R.

  I purchased a new server with a few ip's so I modified the /etc/network/interfaces file recently so that my ip's can go live. While editing that file I created a backup and deleted the original file. I recreated the interfaces file using the touch command and gave +x permissions but now, when trying to restart the interface (/etc/network/interfaces restart) I get all sorts of errors: /etc/network/interfaces: line 10: iface: command not found /etc/network/interfaces: line 11: address: command not found /etc/network/interfaces: line 12: netmask: command not found /etc/network/interfaces: line 13: auto: command not found Can any1 point what I forgot to do? Thanks.

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• Superscope DHCP leases and configuration set up

  - by Vdub

  Hello I wanted to see if someone could help with a network problem I am having. Right now we have a super-scope and scopes of 192.168.50.1 and 192.168.51.1, as of now both are activated but only 192.168.50.1 is handing our leases, 192.168.51 wont. here is a summary of our network Gateway: watchguard firebox x750e for our router/gateway at 192.168.50.1 I set up as a secondary IP address 192.168.51.1 Server: Server 2008 r2 standard, running our DNS @ 192.168.50.242 and 8.8.8.8 as a secondary, AD, and DHCP. On that NIC card i have 192.168.50.242 as the IP address and 192.168.51.242 as a secondary. 192.168.50.1 as the default gateway and 192.168.51.1 as a secondary. Im am not very knowledgeable at this but as far as i have researched after adding a super scope and activating scopes, they should automatically start handing out addresses and I cant figure out why only one does. any help at all would be appreciated.

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• 10 System LAN latency with ADSL modem as gateway

  - by itsoft3g

  Recently I expanded LAN in my office from 3 to 10 computers. Structure star topology, one ADSL Modem connected to One Switch which is again connected to 10 computers. Also we have Wifi device Netgear which is connected from switch. ADSL Modem acts as the DHCP Server, all the system will have default gateway IP (ADSL Modem's IP) Network latency is now become very high, All the chat severs disconnect often like google talk, skype etc, also internet become very very slow. when all the computer turned on. We have 4 Mbps Download and 100 Kbps upload Net speed. Its look like ADSL Modem cannot able to handle all the connections. I tried to setup a system as default gateway which will connect to modem, not sure how to do this. Please advice on this.

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• How to block/redirect hosts and subdomains of a host using htaccess?

  - by Sven

  I want to block several host-domains and their subdomains, as well as IP-Adresses using htaccess. So far I added to my .htaccess-file: # block doamins and all subdomains Deny from .example.org # block domainrange: 1.2.3.[1-255] Deny from 1.2.3. # Block single IP Deny from 2.3.4.5 but still I had problems with spam from e.g. server1.example.org. What is wrong with my script? Is it also possible to redirect all requests from certain hosts/IPs to a document (say: info.html)?

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• Web Development - How to access custom host, defined in my hosts file, from another device in the same network

  - by Neara

  Ok, I hope i'll be able to explain the issue im experiencing. I'm working on a project, that has 2 parts: one takes all requests from usual localhost, the other handles requests from myhost.local. While trying to access both addresses from my computer, it works ok. But now i need to test myhost.local on mobile devices, connected to the same network. Usually i would just run server from my computer ip in the network: python manage.py runserver 10.0.0.8:8000 And then from any device, going to 10.0.0.8:8000 would show the project im working on. However, now accessing that ip address routes me straight to localhost. So, my question is how to access myhost.local from another device in same network? I don't want to change router settings, if that can be avoided, cos sometimes i work from places where i can't access router admin. Is there any network settings on my computer, that i can change to fix the routing to myhost.local w.o losing access to localhost as well?

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• exim4: multiple domains/IPs

  - by ButterdBread

  On my VPS I have 3 IPs which all have their own domain and their own reverse-DNS records. I have a website on each domain, sending emails. The problem is: the emails are rejected by many hosts because the reverse dns doesn't fit the host in the helo. All the emails are sent from the primary IP and therefore only one of the three domains work. I am looking for a way for exim to check which email adress i'm using to send the email and adapt the domain/IP transmitted in the helo. I have already tried many configurations but nothing has worked up to now. Simply changing MX-Records is impossible too, as I recieve (and also send) email via gmail and I don't want to set up my own webmail. Does anyone know a solution?

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• MMS gets hostname from uname and can't connect to it

  - by Adam Monsen

  I'm trying to get 10gen's MongoDB Monitoring Service monitoring my 3-node replica set. The replica set running in an AWS VPC. Each node runs on a different [virtual] machine. Assume their IPs are 192.168.1.1 (primary or secondary), 192.168.1.2 (primary or secondary), 192.168.1.3 (arbiter). From a quick look at the source, MMS appears to get the hostname of the machine it is running on like so: platform.uname()[1] For my VPC EC2 instance, this returns something like ip-192-168-1-1 MMS then tries to connect to this hostname, which does not resolve. I'd rather just use IP addresses (since they're always static), but it seems like the hardcoded use of platform.uname()[1] in mmsAgent.py precludes that. So, what's an elegant way out of this? Hack /etc/hosts? I'm not setting up a DNS server just for this. Maybe I'm just misunderstanding how to configure MMS.

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• Mac OS X 10.6.5 and link-local addresses (169.254.x.x)

  - by WMR

  Starting with the latest update of Mac OS X (10.6.5) all Apple applications (Safari, Mail, iChat, etc.) don't connect to the internet anymore, if the assigned IP address is from the 169.254.0.0./16 range. This is not a routing problem, I can still ping any server I want, even connecting via command line tools works. I know this problem could easily be fixed by changing the IP address to a more common RFC1918 address (e.g. 192.168.0.0./16), but this is what the ISP assigns via DHCP and I am not sure I can convince them (Xplornet) to change that. So I am wondering if there's a (hidden?) setting that would convince Apple applications, that they are in fact still online.

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• Working with a copy of my Virtual Machine

  - by Gaby Reyna

  Hi there I'm trying to make a backup/copy of my virtual machine, it's installed in a Windows Server 2000 and I want to make some modifications/tests without changing the original one. The copy is to be used in Windows 7, what I'm trying to do is work/modify an application that communicates with a DB, this application is hosted on the VM, the DB too, and since I don't want to screw up the stable version I want to know how to copy the VM to my desktop pc to experiment without worries. Now, someone told me I might have problems with the IP 'cause the original will have the same IP, and if I change it, it won't work properly. Is this true? If it is indeed true, any suggestions??

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• understanding my site's DNS records

  - by DaveM

  firstly apologies for using the word 'pointage' this is the word my french domain registrar uses so I may have used to wrong term. OK I would like to better understand what is going on on my 'pointage' record on my domain registrars site. for my (currently empty) web site it reports the following details... Type : Host : Destination A : www.mydomain.org : 62.210.176.146 A : mail.mydomain.org : 84.246.225.176 Mx : .mydomain.org : mail.mydomain.org I think I understand the MX record, that simply relays anything onto the mail.mydomain.org location. However why are the destination for the www and mail domains different. Even more confusing (for me) is the fact that if I ping either of www.mydomain.org or mail.mydomain.org the ping returns a different IP address. This IP address is consistent with that of my server (ie 92.39.247.92). So what exactly is going on ? I'm sure I could find the information on the web,I've read a few thing on the debianhelp site regarding DNS records, and it seems to suggest that the record should be a reverse lookup, but certains isn't the reverse of my servers IP ? but I don't what I should be looking for, so links to docs and search terms for google will be happily accepteed (even though they go against the grain of SO answers to question). thanks in advance. David. ps. I should add that everything seems to work just fine, and I've just descovered this part of the management page of my registrar. Edit: Addition of DNS records and ping results. The DNS record for the site. From what I've read there should only realy be a single 'A' record, so has something gone wrong ? should I change it (remove the extras and then just point www.facilitee.org - .facilitee.org and mail.facilitee.org - .facilitee.org here is the DNS record A www.facilitee.org ? 92.39.247.92 A .facilitee.org ? 92.39.247.92 A mail.facilitee.org ? 92.39.247.92 A webmail.facilitee.org ? 92.39.247.92 MX .facilitee.org ? mail.facilitee.org ping results... ~$ ping www.facilitee.org PING www.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): ~$ ping mail.facilitee.org PING mail.facilitee.org (92.39.247.92) 56(84) bytes of data. 64 bytes from vps4576-cloud.dns26.com (92.39.247.92): So the DNS and the ping correspond, but the 'pointage' doesn't. ~ how can I get a report of the pointage records other than from my registrar ?

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