Can I write a Windows Task or some kind of configuration script that will choose between two Local Area Connections according to the website I am visiting?
It may not be the best answer to my problem, but if it is possible, at least I know it will work.
The issue in full:
My main ISP currently has an issue routing me to my own websites (all hosted on the same server). It also has a 'sticky IP address' (note, not static) - it will only change your IP address once a fortnight, and they can't (won't) even force a change. Their second line support are working on the issue, but so far, no good, and I cannot access my own websites via their internet connection.
So, currently, I am switching from my main network to my mobile 3G network (tethered) any time I want to work on or view my own websites.
I would like to write a script that will make Windows automatically choose my mobile network for FTP, email and browsing my own websites, but use my main ISP for all other online activity.
Haven't a clue where to start - any help appreciated! Thanks,
Sarah
Well, that was simple, no scripting required. If you're using IPv4 (you can check here https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDoQFjAB&url=http%3A%2F%2Fwww.amiusingipv6.com%2F&ei=Bq4_UpakM4vv0gXboIDwCQ&usg=AFQjCNHiUnyKvVcUe8Z966YwoycLI28urw&bvm=bv.52434380,d.d2k)
Turn Windows features on or off.
Turn on RIP Listener.
Disable your internet connection that cannot connect to the website you are trying to access, and 'tracert' to the website: make a note of the IP address of the website, and the first IP address in the hop list ([FIRST IP]).
Type in 'route print' and make a note of the Interface number of your secondary internet connection.
Type in 'route add -p [WEBSITE IP ADDRESS] mask 255.255.0.0 [FIRST IP] IF [INTERFACE NUMBER] metric 1'
Reboot.
All traffic to the website IP address (be it mail, FTP, whatever) will go through the secondary connection, all other traffic goes through the main connection.
IPv6 instructions here:
http://windows.microsoft.com/en-gb/windows7/configuring-multiple-gateways-on-a-network
My setup is just an iPhone connected via USB as secondary connection and a Home Hub connected via ethernet as primary.
Hope this is useful to someone else - but of course, no one should ever think of using this to get around IP blocks on message boards...
Sarah
I have a project based on windows Phone 7.5, which contains a module to ping remote devices (in the same subnet or internet). I tried to perform an echo request and reply on port 7. but reply does not comes back, rather, an NullReferenceException occurs when I try to access SocketAsyncEventArgs.Buffer. I also tried creating ICMP type packets in app, but no luck.
As far as my understanding goes, icmp packets are not allowed to perform ping. however, from desktop, the phone can be pinged if ip address of phone is known.
I have checked many applications on marketplace (like Console WP7 Lite, TestMyNet), those can perform ping by sending icmp packets and can also access Round trip time of ping operation.
I am wondering how those applications can ping to remote (accessible) devices, when windows phone sockets does not allow icmp packets.
Can anyone help me.
Thanx for help in advance
Are you sure these apps can ping local network? For example can they ping WP Wifi interface's gateway or the WP Wifi interface itself? Or can the only ping hosts on Internet? I tried both apps mentioned by you, and even more and they ping everything except local network. That is why i was convincend that they use external server to perform pings and roound-trip is only calculated or estimated somehow.
Piotr Wojtowicz
How do I know visitor's MAC address on linux hosting (nginx)?
From ethernet user.
Thanks.
You cannot get that through PHP.
Networks protocol are used in a stack. When doing HTTP communications, your web server uses the HTTP protocol, responsible for the high-level communications. This protocol is implemented on the top of the TCP protocol (which brings stream-like connections and port numbers), which in turn is implemented on the top of the IP protocol (v4 or v6, which bring IP addresses for identification), which in turn is implemented on the top of the Ethernet protocol.
The Ethernet protocol is the one you would need to work with. It has both the source MAC address and the destination MAC address. However, most unfortunately, there are a lot of problems with it.
First, the data it conveys is probably hard to access: I say "probably" because I never stumbled upon how to do it.
Second, much like you get your client's router address when they access your site, you get your client's router MAC address at the Ethernet level. Unless they don't traverse any router (which would only happen if your server was directly wired to your client machine without any router interfering, because there are a whole lot of routers out there that relay data to other parts of the Internet), there is no chance that the MAC address you'll receive will be your client's.
Third, Apache will never try to access that data. And since PHP is "sandboxed" into the network environment Apache gives it, there is no way you can wind back to the Ethernet protocol.
So accessing the MAC address of a visitor from a website, from PHP, is not possible.
EDIT Seems you've taken out the PHP part from your question. So obviously, the last point won't stand anymore.
You can't get that with php it's not included in http
The more general question is this one. Since all PHP has to work with (I'm assuming this is PHP running on your webserver, here) is the HTTP request, you won't be able to get the MAC address. That requires something running on the visitor's side.
This may, or may not work. I know it will work on LAN clients, however for external clients it may be incorrect. I don't overly know my networking, but it's worth a shot right?
If you execute the arp -a command on either windows or linux, it will print out your arp records, which you can then parse for the mac.
Other than that, as far as I know, apache (and therefor php) doesn't just give out mac addresses in its env vars.
*Edited: Sorry, that won't work... The better utility is arping however that will just give you the mac of your router.
If you want to do this, clients will need to be directly connected to your server, with no router in between...
However if that is the case, then arping will work... I don't know of a better tool, but it seems a bit wasteful to do a ping (in root) for just a mac address.
The mac address is only visible on for the network provider if i'm correct (your internet host can see the mac address of your router for example), don't think you can get it with php.
The project I'm working on is to handle data capture from scan guns (Pocket PC 2003) and process this data on a host (Win XP) then into our inventory database on a separate server (Win 2000). This is all driven by the Remoting framework provided by MS and As Good As It Gets (http://gotcf.net). The application is complete enough for a general proof of concept with both the client and server working properly while in the emulator.
All is well until I began to test using actual scan guns. Due to security concerns, the scanners are on a separate network (for clarification the 10 network) than the server (the 15 network). My development machine has dual NIC connected to both networks and can communicate with both independently. However, I am having issues with my application receiving information from the 10 network using .Net Remoting, and then sending out information to the server on the 15 network via a third party app (Combination of ODBC, Btrieve, and OLE).
Is there anyway to process information from one network then update the server on another?
Any suggestions will be greatly appreciated!
Note: I'm not very familiar with networking, thus I may be calling it the wrong name but the gun IP's start with 10...* and the server IP's start with 15...*
So long as the computer's routing table is properly configured, you shouldn't have to worry about this from your application. So long as you're using the proper IP addresses, the networking stack should take care of delivering things to the right place.
You might want to check the output of "route print" (at least I think that was available on WinXp -- if not, someone else will likely post the correct command for XP soon). In any way, you should see what network destinations are configured for which interfaces. You'll need to make sure that the server's IP on the 15 network will properly route via the interface you want (ie. the lowest-cost matching destination/netmask lists your 15 interface).
The issue seems to stem from both the NIC cards not set up properly and a so far unresolved issue with the frameworks I've chosen.
To solve the NIC problem, the easiest solution I'd found had me clear the default gateway on the 10 network.
The other issue deals with recreating the remoting objects after they've been destroyed. I currently have to warm boot the scanner in order to re-connect to the host. In order to correct this issue I'm going to contact As Good As It Gets to see what their input is. Damn firewall
I often run into problems where I can't get something to connect to something else. I usually forget to check something obvious. Can you help with:
A tip/technique for diagnosing a connection issue
The name of a tool or application that can help (and the situation in which it's useful)
I know the question is a little non-specific, but hopefully the answers can form a useful starting point for anybody who's stuck trying to get computers/programs talking to each other.
Please can you give one answer per answer so the best ones can be voted up.
Simple checks to run when debugging network problems:
Has each machine got an IP address, Go to command prompt and run ipconfig. Key things to check here are the interfaces and ensuring the appropriate ones have IP addresses.
Check both machines IP addresses are in the same range and subnet if you are running it on an internal or Virtual network.
Try pinging each machine from the other to see if they can communicate with each other. Note that some firewalls will block ping requests.
If Pinging fails then check to see if firewalls are active. If the communication is within a 'safe' internal network then try disabling the firewalls and re-pinging.
If the connections are over a wireless network then check signal strength.
If pinging fails and you are connecting through several networks then try running a tracert to see at which will may show you where on the network the connection is failing.
If you are able to ping but not connect then check firewall settings and network connection settings. Windows 2000+ has the capability of setting port an ip access on a connection properties.
Try drawing a network diagram of the connections to help in visualising the problem.
If you are connecting through routers, firewalls and loadbalancers then check that all devices are not tied to any specific ip addresses and that the IP address redirection (if in place) is correct. Also check any NAT logs to see if connections are being received and properly re-directed.
Wireshark
Latest versions of ProcMon
netstat
Wireshark www.wireshark.org
Wireshark is a network protocol analyzer for Unix and Windows.
Features:
Deep inspection of hundreds of protocols, with more being added all the time
Live capture and offline analysis
Standard three-pane packet browser
Multi-platform: Runs on Windows, Linux, OS X, Solaris, FreeBSD, NetBSD, and many others
Captured network data can be browsed via a GUI, or via the TTY-mode TShark utility
The most powerful display filters in the industry
Rich VoIP analysis
Read/write many different capture file formats: tcpdump (libpcap), Catapult DCT2000, Cisco Secure IDS iplog, Microsoft Network Monitor, Network General Sniffer® (compressed and uncompressed), Sniffer® Pro, and NetXray®, Network Instruments Observer, Novell LANalyzer, RADCOM WAN/LAN Analyzer, Shomiti/Finisar Surveyor, Tektronix K12xx, Visual Networks Visual UpTime, WildPackets EtherPeek/TokenPeek/AiroPeek, and many others
Capture files compressed with gzip can be decompressed on the fly
Live data can be read from Ethernet, IEEE 802.11, PPP/HDLC, ATM, Bluetooth, USB, Token Ring, Frame Relay, FDDI, and others (depending on your platfrom)
Decryption support for many protocols, including IPsec, ISAKMP, Kerberos, SNMPv3, SSL/TLS, WEP, and WPA/WPA2
Coloring rules can be applied to the packet list for quick, intuitive analysis
Output can be exported to XML, PostScript®, CSV, or plain text.
work the OSI model from the bottom up
Physical (Do you have a network adapter/connection)
Link layer (arp, ethernet port blocked by network team (I've seen this where locked down environments see two MAC addresses coming from one workstation port and shut down the port)
Network layer (ipconfig, tracert, ping,)
Do you have a network address (DHCP, fixed)
Are you on a proper subnet/have routing between subnets
Is something in the middle blocking you
firewalls, routing tables
When in doubt, check to see if the windows firewall is messing with your communications. 8 times out of 10, it's at fault.
Using tracert is a good start to see how far along the chain you are getting.
For virtual machines it's usally a good idea to make sure you have the loopback adapter set correctly in the Host os.
Most frequently used tool is the ping. It can be used both to test your connection and the availability of a target
Second tool is the tracert if you want to see where the packets get lost.
For more advanced debugging I use the following tools: nmap, wireshark, etc.
Windows has a netstat utility which is pretty similar to the Unix netstat and can do a number of different things that might help you solve network issues.
Random example:
netstat -r displays routing information
netstat /? for usage information
Since you said you're using 2 virtual machines I would hazard a guess that both machines are setup in a NAT configuration (rather than a unique network device) -- In the NAT configuration, neither machine would (typically) be able to ping the other.
If you're familiar with the command line, you can try the "netstat" command.
You can also try "arp -a" to list all the IP/MAC addresses known to your PC.
The "tracert [ip address]" command will show you how many gateways/routers your packets jump through on their way to their destination. (This is probably not helpful if both machines are on the same network, though.)
And don't forget to check your Windows firewall settings.
Otherwise, if you want to get down and dirty, you can try the packet sniffer known as Wireshark: http://www.wireshark.org/ (aka. Ethereal)
Pull the network cable out
If you can get some communications to a device (eg a ping), but can't get your program to talk to a service on the computer. Then, try pulling the network cable out and see if the ping stops. This will verify you're communicating with the computer you really think you are.
On windows i user PortQueryUI : http://www.microsoft.com/en-us/download/details.aspx?id=24009
DNS activity: Portable DNS Cache and Firewall;
General network activity: Wireshark, Network Monitor;
Windows utilities: ping, netstat, nslookup.
You need to be use the process of elimination, for example if you can ping the ip address but not the hostname then there's DNS issues. If you can ping the system but not connect to a share etc.
DNS out of sync
If you're using a virtual machine and you perform a roll-back on it, then it could become out of sync with the DNS (Domain name server). Try to remove and re-add the machine to the domain, or if you've got access to the DNS machine, then get it to flush its cache.