Private ip addressing

What would happen if I used say 172.1.0.0/16 on my network which is not a private address ? what probs would this cause ?

you can use this ip address only for you testing or only for your internal LAN which is not connected with the internet...otherwise it give the ip address conflict...
regards
Devang

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Bypass proxy for FQDN with private ip addresses

We have Windows 7 with IE 11
We need this IE behavior:
"to all FQDN names that resolves to local (private) ip addresses - do not use proxy."
how can we implement this?
("Bypass Proxy Server for Local Addresses" Option don't work as needed)

Hi,
Please take a check to see if the following KB article could help here:
Internet Explorer Uses Proxy Server for Local IP Address Even if the "Bypass Proxy Server for Local Addresses" Option Is Turned On
The cause: By default, only host names are checked when the Bypass proxy server for local addresses option is turned on.
The resolution here is :
To bypass a range of IP addresses or a specific domain name, specify the addresses in the proxy exception list:
In Internet Explorer, on the Tools menu, click Internet Options.
On the Connections tab, click LAN Settings.
Click Advanced, and type the appropriate information in the
Exceptions area.
Hope this may help
Best regards
Michael Shao
TechNet Community Support

Private IP Addressing---? Manual Settings

Our Cbeyond service gives info that we have Private IP Addressing for Network Config. Public IP Addressing is not provided.
Does that mean that I can't use Automatic but must do Manual Settings for Internet Accesss?

Okay I know you are going to ask how.
When you visit the above website actually when you visit any website, it needs to know your external IP address in order to deliver the information from that website to your browser.
What the browser wants to do is send a command to the Web server on www.apple.com that looks like this:
GET /index.html HTTP/1.0
Here's how that happens. The command is made into a packet, a block of bits like a telegram that is wrapped with three important things; the source address (the IP address of your machine), the destination address (17.254.0.91 ), and a service number or port number (80, in this case) that indicates that it's a World Wide Web request.
Your machine then ships the packet down the wire (your connection to your ISP, or local network) until it gets to a specialized machine called a router. The router has a map of the Internet in its memory — not always a complete one, but one that completely describes your network neighborhood and knows how to get to the routers for other neighborhoods on the Internet.
Your packet may pass through several routers on the way to its destination. Routers are smart. They watch how long it takes for other routers to acknowledge having received a packet. They also use that information to direct traffic over fast links. They use it to notice when another router (or a cable) have dropped off the network, and compensate if possible by finding another route.
Once your packet gets to its destination machine, that machine uses the service number to feed the packet to the web server. The web server can tell where to reply to by looking at the command packet's source IP address.
This is your external IP address in other words the website needs to know where to send the webpage information back to.
When the web server returns this document, it will be broken up into a number of packets. The size of the packets will vary according to the transmission media in the network and the type of service.
So why doesn't it supply your internal address, well this is because your router uses NAT and it knows what client on the internal network asked for the information and it is the router (with the external IP address) which asks and therefore when it receives it back, it then forwards it to the client.
As the router asked for the info, it is the router's address which is reported (the external address) and not the internal address.
What this means is that everything you ever ask for on the internet is recorded by the websites you visit.
iFelix
PS In future Gino please start a new topic (referencing the one that sparked the question) to avoid over-complicating topics, thank you.

Private IP addresses

Which three addresses are private IP addresses? (Choose three.)
a 10.0.0.1
b 46.1.1.88
c 172.31.31.10
d 172.32.16.10
e 192.168.8.8
Can you tell me the right answer ?
I think the correct answer is a,c,e am I right ?
thanks

Jan
Yes you are right, the private IP address ranges are -
10.0.0.0/8 which covers 10.0.0.0 -> 10.255.255.255
172.16.0.0/12 which covers - 172.16.0.0 -> 172.31.255.255
192.168.0.0/16 which covers 192.168.1.0 -> 192.168.255.255
Jon

Equivalent of XP's "Automatic Private IP Address"?

Does Leopard have the equivalent of XP’s “Automatic Private IP Address”, which generates a range of IP address if a DHCP server isn’t available?
If not what is the recommended download for allowing Leopard to generate IP addresses if no DHCP server is available?

Well, technically you can't generate IP addresses without some sort of DHCP server. But to answer your question in OS X it's called Internet Sharing which enables a computer with an Internet connection to share that connection with other computers. Select Mac Help from the Finder's Help menu and search for "internet sharing."
However, it would be preferable to use a router.

HT3477 I am attempting to set up a guest network. When I change the Network settings to DHCP NAT I get a message that tells me that the service has a private IP address and so I must connect using off bridge mode. In this mode I can not connect to the int

I am attempting to set up a guest network on the Airport Extreme Base Station. The Base Station is connected to a DSL Modem. The network is also extended using an Airport Express. When I have attempted to set up the Base Station using DHCP NAT in the netword feature I get a message that because the service has a private IP address the only way that I can connect is in Off Bridge Mode. In this mode I do not seem to be able to connect to the internet using the guest network. Any suggestions would be helpful.

Ok, your Speedport is actually a combination DSL modem and wireless router. In this case you would typically configure a downstream router, like your AirPort Extreme in Bridge mode. Unfortunately, when in Bridge mode, the AirPort does NOT support providing a guest network.
The only possible option is to reconfigure the Speedport as a bridge and use the Extreme as your Internet router. You would still need the DSL modem provided by the Speedport for Internet connectivity.

Port map to more than one 'private IP address'

Hi,
probably a silly question, but ...
Is it possible to port map on an Airport Express to more than one private IP address? IOW, if the first IP address is not available/active, then the port is forwarded to the second IP address.
Grant

Hi iFelix,
yes, I have 2 networks, home & studio. I take my powerbook with me between the 2. When I am in one of them, I want to be able to control the other.
At the moment, I can map to another machine (not my powerbook) in the Airport Express settings and then I can connect via VNC. If however, I want to have a more complete control, I need to map port 3283 specifically to my powerbook. Obviously, if the powerbook is with me, then it's not where I'm not, if you follow the rather Pooh bear logic.
My problem would be solved if I could map to one IP address as default, with a second if that address were not resolved/found/available.
As for VPN, yes as I have gleaned from much browsing of net and these forums, this would solve my problem, but it seems overly complicated to set up for a non-IT person. Looking at the interface for a router/modem is a frightening thing for people who only do this once in a blue-moon.
Grant
AluBook 17

How is the "Private IP address" field supposed to work?

I have been trying to forward port 25565 using an Airport Extreme. I know how to forward ports, and I know my IPv4 address is 10.0.1.2. The router (Airport Extreme)'s address is 10.0.1.1. However, when I go into the AirPort Utility and try to configure this, it gives me a field after "10.0.1.2" asking for some mysterious extra number on the end of this already complete address. It will not let me continue without filling this box out, but what do I put in it? ipconfig clearly shows that 10.0.1.2 is the extent of my computer's private IP. What do I put in this box? How is this supposed to work at all?
Also, the "Browse..." button to the right of the mysterious field is utterly useless; it opens a window showing nothing in particular.

Configuring port mapping on the Extreme typically takes two basic steps. Configuring the host with either a static or DHCP-reserved IP address, and then, assigning the appropriate UDP & TCP ports to the host.
AEBSn - Port Mapping Setup
To setup port mapping on an 802.11n AirPort Extreme Base Station (AEBSn), either connect to the AEBSn's wireless network or temporarily connect directly, using an Ethernet cable, to one of the LAN port of the AEBSn, and then use the AirPort Utility, in Manual Setup, to make these settings:
1. Reserve a DHCP-provided IP address for the host device.
AirPort Utility > Select the AEBSn > Manual Setup > Internet > DHCP tab
On the DHCP tab, click the "+" (Add) button to enter DHCP Reservations.
Description: <enter the desired description of the host device>
Reserve address by: MAC Address
Click Continue.
MAC Address: <enter the MAC (what Apple calls Ethernet ID if you are using wired or AirPort ID if wireless) hardware address of the host computer>
IPv4 Address: <enter the desired IP address>
Click Done.
2. Setup Port Mapping on the AEBSn.
AirPort Utility > Select the AEBSn > Manual Setup >Advanced > Port Mapping tab
Click the "+" (Add) button
Service: <choose the appropriate service from the Service pop-up menu>
Public UDP Port(s): <enter the appropriate UDP port values>
Public TCP Port(s): <enter the appropriate TCP port values>
Private IP Address: <enter the IP address of the host server>
Private UDP Port(s): <enter the same as Public UDP Ports or your choice>
Private TCP Port(s): <enter the same as Public TCP Ports or your choice>
Click "Continue"

Cannot resolve private host addresses

Hi,
I have a MacBookPro (10.5.5) in a Windows Network. After our Primary Domain Controller
was updated i get a strange error message when i want to view my network neighbourhood.
The name next to the network icon reads "cannot.resolve.private.host.addresses".
I googled but I have not found a single resource mentioning this error message.
I have access to the internet, i can access all shares in the network via command+k but i cannot
browse the network because of this error.
what is it? what is it that the mac cannot resolve? where can i look further into resolving this issue?
thnx very much
martin

Problem solved
It seems that the Mac made a reverse lookup for its own IP-Adress to get its own name.
Since the new Domain Controller did not have Reverse Lookups enabled the aforementioned problem occured.
After enabling them everything is working fine now

MPLS over ATM and Private IP addresses

Are there any caveats using private IP addresses at one site and public registered IP addresses at another site connecting with MPLS over ATM thru our ISP?

No. You should be able to configure this using NAT.

Shows my private IP address in website

Hi
I usess private ip address like 192.168.10.50 and it goes to internet by nating in router.
but when i visit www.dnsstuff.com then wonder to see my IP address and nating real IP address.
so my question how they know my address even in yahoo chat also found that you connect from this IP address, how it is possible.
thanks
Biplob

Hello,
Looking at the site, I'd say they use the My IP Address tool added 16-Aug-2005. If you click that link and go to the more info you will see additional detailed information about your connection.
For my connection I see either my NAT'd VPN IP or my NAT'd public IP. I do not see the 192.168.x.x or 10.x.x.x address in the output.
Hope this helps.
Regards,
James

Gethostbyaddr failing for private IP addresses

We are having problems with reverse DNS resolution for our private IP addresses. We first noticed this when our syslog-ng was not displaying name in the log entries, but rather IP addresses.
Nslookup and dig reversed resolved the addresses fine, so we don�t think the issue is in DNS.
We further narrowed down the source of the problem when we wrote a small C program that called gethostbyaddr for the private address. This program also failed to reverse resolve the addresses.
We decided to snoop the traffic to our DNS server. What we saw was that no packets were being sent. In other words our Solaris server didn�t even try to query DNS for the reverse resolution.
Is there a flag or setting somewhere in Solaris that we can adjust to have reverse resolution for private IP addresses sent to our DNS servers?
Thanks�
Mike

Make sure the addresses aren't already present in /etc/hosts or /etc/inet/ipnodes. Otherwise it probably won't attempt to use DNS.
Darren

How to assign a private IP address to a public IP address

Hello.
At the beginning sorry for my poor English. My company uses a Cisco 881 router and I have the following problem to resolve. I need to assign an local IP address from my private network to an public IP address (this is the public IP address of the SMTP server). As a result, I want to do the following thing: I would like to use an local IP address in the SMTP server settings of the email client instead of an IP address of the service provider. Device, which I have to configure with SMTP server is connected via a VPN and I can't use a public IP address of email provider. Thank you for any respond.

Hello.
At the beginning sorry for my poor English. My company uses a Cisco 881 router and I have the following problem to resolve. I need to assign an local IP address from my private network to an public IP address (this is the public IP address of the SMTP server). As a result, I want to do the following thing: I would like to use an local IP address in the SMTP server settings of the email client instead of an IP address of the service provider. Device, which I have to configure with SMTP server is connected via a VPN and I can't use a public IP address of email provider. Thank you for any respond.

Open Directory server on two Private IP addresses - acting slow

We have an OS X Open Directory server that has two non-routable IP addresses.
Primary - 10.0.0.x (LAN) with 10.0.0.x gateway
Secondary - 172.16.0.x (SAN) with no gateway
When it is plugged in to both networks, Server Admin responds very slowly. If the server is just on the primary interface, Server Admin responds normally.
We also have a replica that is on the two private networks.
Primary - 10.0.0.x (LAN) with 10.0.0.x gateway
Secondary - 172.16.0.x (SAN) with no gateway
When we launch Server Admin on the replica, Server Admin says there's no server found at this address, even when it is looking for server.local, as opposed to server.domain.com.
Again, if you put this server on the primary 10. network, it works fine.
What's going on?

For anyone else interested, I eventually decided that a fully-qualified domain name seems to be necessary for some services, and that OS X Server doesn't seem to know exactly when that is the cause of problems, and the documentation doesn't really specify exactly what it is necessary for. So I had my organization set up a FQDN for the server, even though it's only meant to be used internally, and that seems to fix things.
Greg

Third Party VPN Solution - Private/Dynamic Addressing

I am looking for a solution for the following:
I need a to bring up sites in remote locations that don't have access to Cisco gear. I would like to be able to grab a PC or Linksys or equivalent and bring up a site to site VPN with a Cisco router.
The Internet connectivity at these locations typically is using dynamic, private addressing.
I am aware of the DMVPN solution but again this would require Cisco gear at the remote site.
We have Cisco gear at the Head End.
Does anyone know of a model of highly available cheap hardware or a software package that can be loaded onto a PC to accomplish this?
Please advise.
Thanks!

We are looking for a site to site model. I want all the devices on the remote network to be on their own subnet. We need to be able to hit individual remote devices from the head end. The devices at the remote site in turn also need to be able to communicate with each other without having to use the VPN.

Separate private ip addresses for non-global zones

I'm testing zones on one of our administrative servers and I'm wondering about the following scenario.
Zones can easily run away with a lot of ip addresses and I decided to try this. The machine has, in its global zone, a standard private address in the admin (192.168.129.0) segment on hme0. I have also given it another address, 192.168.229.1, configured on hme0:1 which I intend to be the defaultrouter for non-global zones.
Zone 1 has as its primary address 192.168.229.10, and I have tried to set the default router to 192.168.229.1 by various methods based on what I have read in here., including adding that address to the defaultrouter file in the global zone.
Zone 2 has 192.168.229.20 as its primary address and is intended to have the same default of 192.168.229.1.
So far I've not been able to make this work . Am I barking up the wrong tree?
TIA

Sorry for the late reply.
So if I understand correctly, you want to put all your zones in a dedicated IP network (192.168.229.0/24).
To do this, you don't need to configure the global zone as default gateway for the zones (which doesn't work, as you noticed). You want to indicate to the zones that they can reach the other network (192.168.129.0/24) just by sending packets on hme0. To do so, you need to create interface routes in every zone:
# route add net 192.168.129.0/24 192.168.229.10 -interface(same for Zone 2, etc.)
The global zone then needs to advertise itself as gateway for the 192.168.229.0/24 network to the other hosts. I think in.routed(1M) can do this using special configuration in the gateways(4) file, but I don't know how. Otherwise, if you can administer the real router that the other hosts use, you can add a static route: destination 192.168.229.0/24, gateway [global zone IP].
hope this helps,
Blaise

Private ip addressing

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