roddy
Registered user
Hi Folks
how do you find out the IP adress a provider gives you if you connect via a router ?
cheers
how do you find out the IP adress a provider gives you if you connect via a router ?
cheers
IP address
- Thread starter roddy
- Start date
Try visiting https://www.grc.com/x/ne.dll?bh0bkyd2
it will tell you near the bottom of the page
it will tell you near the bottom of the page
unshift
Registered user
you should be able to see it in the admin utility of the router, alternatively most if not all routers you should be "telnet"able <sic> and depending on the manufacturer you can run a basic command such as sh conf or similar and it will tell you the inside or outside address, you are looking for the outside address
one other option is to try trace route not sure if it will report your local routers outside address correctly but worth a try
if using MS from a command(dos) prompt type
tracert www.ukgser.com
it will report all the routers along the way yours will be the second hop
most isps, unless you request it don't assign a static IP to your router ie. it will change wheny router reboots
one other option is to try trace route not sure if it will report your local routers outside address correctly but worth a try
if using MS from a command(dos) prompt type
tracert www.ukgser.com
it will report all the routers along the way yours will be the second hop
most isps, unless you request it don't assign a static IP to your router ie. it will change wheny router reboots
unshift
Registered user
Clive said:
nice one
seems like i was going the long way round, long day
roddy
Registered user
unshift said:
I tried this and get a totally different address from the one reported on either
https://www.grc.com/x/ne.dll?bh0bkyd2
or a small utility I have called "My IP"
which both report the same as the one from the router.
I was just curious how they do this, I'm trying to understand better how IP works and it's connectivity as I have a works laptop which though will work through the router wirelessly to the internet and I can ping both laptop and home PC they can't see each other or use any of the shared services IE printer
so I'm messing about trying to resolve this little problem.
cheers
trotsky
Registered user
I hate to start "It depends..." but here we go.
It depends how your router is set up and how your connectivity is arranged - you may be on a private internet, you may have a small range of iP addresses assigned (unlikely) or you may be using a VPN connection set up by your work. I'd imagine you are probably having difficulty because you have a combination of the two.
A bit of background : If the IP addresses you are using start with either 10.X.X.X, 172.16.X.X or 192.168.X.X then you are on a private internet. The important thing then becomes the subnet mask. I'll come back to that. If you have any other IP address then life gets interesting.
The address of a machine needs to define IP address, subnet mask and default gateway. The combination of IP address and subnet mask defines how many machines are "local" to your machine - bottom line machines that need to talk to each other in the same bit of network should have matching IP address and subnet mask, probably 192.168.1.X/255.255.255.0 or similar. They probably also have a common default gateway although that is less important. The difficulty arises because you can actually do lots of kinky things with a network with a router on it (and your little ADSL modem box, if it doesn't connect to the PC via USB will also be a router).
The fact that you can ping is useful information. That means that the routing between the two machines is such that any device in the way, including the router, knows how to send information backwards and forward at a fairly basic level. The fact that you can't do anything else makes me slightly suspicious. I have a hunch, and it is only a hunch, that your PC is connecting via Virtual Private Network(VPN) to the office and you are getting an IP address through that connection which is different from the "real" IP address on your machine which relates to the local network. That can add all sort of confusion.
If you can give us some idea what the IP addresses, subnet masks and default gateways are for each device I'll have a stab at guessing what the problem might be...
It depends how your router is set up and how your connectivity is arranged - you may be on a private internet, you may have a small range of iP addresses assigned (unlikely) or you may be using a VPN connection set up by your work. I'd imagine you are probably having difficulty because you have a combination of the two.
A bit of background : If the IP addresses you are using start with either 10.X.X.X, 172.16.X.X or 192.168.X.X then you are on a private internet. The important thing then becomes the subnet mask. I'll come back to that. If you have any other IP address then life gets interesting.
The address of a machine needs to define IP address, subnet mask and default gateway. The combination of IP address and subnet mask defines how many machines are "local" to your machine - bottom line machines that need to talk to each other in the same bit of network should have matching IP address and subnet mask, probably 192.168.1.X/255.255.255.0 or similar. They probably also have a common default gateway although that is less important. The difficulty arises because you can actually do lots of kinky things with a network with a router on it (and your little ADSL modem box, if it doesn't connect to the PC via USB will also be a router).
The fact that you can ping is useful information. That means that the routing between the two machines is such that any device in the way, including the router, knows how to send information backwards and forward at a fairly basic level. The fact that you can't do anything else makes me slightly suspicious. I have a hunch, and it is only a hunch, that your PC is connecting via Virtual Private Network(VPN) to the office and you are getting an IP address through that connection which is different from the "real" IP address on your machine which relates to the local network. That can add all sort of confusion.
If you can give us some idea what the IP addresses, subnet masks and default gateways are for each device I'll have a stab at guessing what the problem might be...
If you can ping both machines, file and printer sharing problems are unlikely to be related to IP. Much better off looking at firewall issues – XP SP2 firewall turned on? Zone alarm or sygate installed? Maybe even simply then that – is the printer\folder shared? Start with the basics. Good luck
roddy
Registered user
Hi guys
right I'm aware of IP address and subnets and the like and these are all okay.
I trying to connect through the router wirelessly on the laptop and hardwired on the home PC, this is just so I can print stuff off from the laptop via the network, both computers have the same user names on both machines, I have also shared folders/printers on both machines which when you go into "my network" places the local share's on each computer is seen but not the other computers.
I try to establish a new connection in my networkplaces on the laptop I get a "there is no logon service" available though when I check "services" all the appropriate services appear to be there (server, workstation) and running
I should point out that the laptop would normally be connected to a domain via a VPN but when I'm trying to get the two to talk I'm not connected to the "company"
I have wimdows XP fiewall switch off but use zonealarm on the home PC and it's blackIce on the works laptop, in both cases I have the relevant IP address listed as a trusted address including the gateway address, i have tried switching off all firewalls but this seem to make no difference
any help would be appreciated as this is bugging me.
cheers
right I'm aware of IP address and subnets and the like and these are all okay.
I trying to connect through the router wirelessly on the laptop and hardwired on the home PC, this is just so I can print stuff off from the laptop via the network, both computers have the same user names on both machines, I have also shared folders/printers on both machines which when you go into "my network" places the local share's on each computer is seen but not the other computers.
I try to establish a new connection in my networkplaces on the laptop I get a "there is no logon service" available though when I check "services" all the appropriate services appear to be there (server, workstation) and running
I should point out that the laptop would normally be connected to a domain via a VPN but when I'm trying to get the two to talk I'm not connected to the "company"
I have wimdows XP fiewall switch off but use zonealarm on the home PC and it's blackIce on the works laptop, in both cases I have the relevant IP address listed as a trusted address including the gateway address, i have tried switching off all firewalls but this seem to make no difference
any help would be appreciated as this is bugging me.
cheers
trotsky
Registered user
I've occasionally noticed that Windows XP machines which get their IP addresses by DHCP aren't always very good at giving those up when they are offered a new, similar one. Spent ages fighting a machine that appeared to know it's IP address but when I dug deeper it had an address in the same range but the subnet mask and default gateway were wrong and actually referred to a different site with a similar range of addresses in use.
i'd suggest taking the IP bits out of the equation. Put a manual IP address into each device and see if it can converse then. Choose a machine you think is working well, and use the next sequential IP addresses in the other machines with the same subnet masks and default gateways. If that doesn't work then one or another of your firewalls is biting. Make sure you have given permission for incoming and outgoing connections for what you need or, even better, with teh adsl cable pulled, switch of the firewalls and try it. Put them back one at a time till something dies.
There isn't a lot more that can be doen with networks.
It's a black art I tells ya...
i'd suggest taking the IP bits out of the equation. Put a manual IP address into each device and see if it can converse then. Choose a machine you think is working well, and use the next sequential IP addresses in the other machines with the same subnet masks and default gateways. If that doesn't work then one or another of your firewalls is biting. Make sure you have given permission for incoming and outgoing connections for what you need or, even better, with teh adsl cable pulled, switch of the firewalls and try it. Put them back one at a time till something dies.
There isn't a lot more that can be doen with networks.
It's a black art I tells ya...
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