How to Fetch MAC-Adresses across Subnets

Hi All,
for some reason we have a number of Machines out there where we would like to install a Package via ARD instead of Casper. We have a list of Hostnames from this Machines. Now, the first idea was to ping them and to get the MAC-Adress out of the ARP Cache via arp -a. All together could be used as an Import-File for Remote-Desktop.
But ARP does not work across Subnets.
Now i was wondering - how does for example ARD read the MAC-Adress from a Machine if i do a scan to a specific Network-Range. Could i use this process to fetch the MAC-Addresses? Or could there be another way.
bye
joe

Hi
You could try installing ARD on a client within that range? Poll workstations within that range for relevant information. Save it to the Desktop of that ARD workstation. Transfer it to a memory stick etc. Or if you know the IP address of that workstation you may be able to add it using the network address option from another workstation that's in a different subnet.
Tony

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This is how we are doing it. Hopefully this will help others get it working too.
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Remote locations connected via Verizon T1 and routers with no firewalling
192.168.2.*
192.168.3.*
Our client machines :
Intel white iMacs all running 10.5.2 with no special software for faxing. Our clients are bound to and controlled by our server.
I have been trying to get our server to serve the FAX across our 2 remote subnets since 10.3. With the newer CUPS coming with 10.5 and Apple now owning it I hoped that there would be an easy solution to get non local subnet computers the ability to see shared faxes and printers. Sent a forum question and got the following which was great news
Erich Wetzel wrote:
Can anyone advise, now that Apple owns CUPS, how to allow my other
two subnets to BrowsePoll our server for its printers?
The simplest way is to change the "Allow from @LOCAL" lines to be
"Allow from all". You can also use the web interface and check the
"Allow printing from the Internet", which does the same. If you
don't want to open up that much, just add "Allow from" lines for
each subnet.
Once you make this change, *do not* toggle the printer sharing box,
or you'll have to make the changes all over again.
Michael Sweet, Easy Software Products mike at easysw dot com
Michael,
Thanks for the reply, sounds like you have my solution. Small problem, upon selecting "allow printing from internet" in the web interface and committing the changes, the server restarts and the check box is empty again. In quick tests, the other options can be turned on and off as you would expect. Is there something particular to the Apple 10.5.1 install that would not permit internet printing or not permit this change?
I think the check box state in the web interface is a known bug in
CUPS 1.3.4.
I used the web interface for cups on the server and manually added the networks as described by Michael above. I don't know if it is required but I restarted the server. Open > Safari > browse to localhost:631 and you will get the CUPS web interface. The CUPS web interface is available on servers and clients. You can also browse to an IP or FDQN:631 to get the web interface from a receptive other machine.
The server was now supposedly ready to accept "browsepoll" requests from clients. I had played with this before so I was somewhat familiar with what to do next. Essentially each client needs to be told to contact the server and ask it for its printers. That is what browsepoll does in CUPS.
At the client, be logged in as an admin user OF THE CLIENT. Using Terminal and a text editor, edit as root /etc/cups/cupsd.conf
A few lines down look for:
# Show shared printers on the local network.
Browsing On
BrowseOrder allow,deny
BrowseAllow all
After that we added :
#*added by Erich*
BrowseProtocols all
BrowseRemoteProtocols all
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BrowsePort 631
#*added by Erich*
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This last piece came from a discussion started by Alessandro Dellavedova : check the starting post
http://discussions.apple.com/thread.jspa?messageID=5702731&#5702731
If you go to Safari > Localhost:631 on the client, CUPS should now see both the printers and the fax which are being hosted by your server.
Here's the fun part for me, with no additional playing I was now able to see the fax we created long ago in the print dialog printer list. You do not have to go to Print > PDF > Fax PDF, you can but do not have to. Just select the fax from the printer list and the dialog changes to fax appropriate options. Now we were able to print any document to the fax directly.
Odd behavior I have yet to figure out. I do not see the fax in the System Preferences > print and fax pane on the client machines. However, I can now fax through our server from all of our clients no matter what subnet they are on.
Making the same additions to the cupsd.conf file on remote machines which VPN via the internet to your network will get them the printers and fax in the same way. I do this with a powerbook and Imac from home so i can print at and fax from work.
This is what I did to get it working for us. Hope this helps.
-Erich

This is Great! Thanks a lot, this was exactly what I was looking for!

CUPS printer sharing across subnets?

I am trying to set up my local network printer so that everyone in the house can print from it. However I have two subnets in the house and I don't see how to connect to the Linux server through a Windows 7 client.
My network is like so:
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*Edited for further clarification & error fixing.
Last edited by felixculpa (2012-12-27 20:03:51)

DiverDoc wrote:
if I can share a printer between an XP system and a Win 7 system?
Before I enter all the system data, I just wondered if someone already knew the answer to this one. I was successsfully sharing a non network printer plugged into an XP machine via USB and printing to it via Network Magic from my Vista machine, but since I upgraded Vista to Win 7, I cannot. Everytime I try to install the remote printer or access it in any way from my Win 7 machine, I get the Windows message: " Windows cannot connect to the printer". This also occurs form within the Network Magic Map if I try to Complete Printer Setup. It shows up on my Win 7 machine when I want to ADD a Printer, but I cannot install it. It shows as Shared on the XP machine.
Thanks for any assistance!
S.
Hi S.,
You need to use Network and Sharing Center and open up your computer. You need to use the Public Profile and turn on Network Discovery. Not sitting in front of Windows 7 at the moment.
Otherwise, you need a Wireless Printer or All-In One Machine or a Printer that plugs into the Router using an Ethernet Port.
thecreator - Running Network Magic version -5.5..9195.0-Pure0 on Windows XP Home Edition SP 3
Running Network Magic version -5.5.9195.0-Pure0 on Wireless Computer with McAfee Personal Firewall Build 11.5.131 Wireless Computer has D-Link DWA-552 connecting to D-Link DIR-655 A3 Router.

Multiple routers and subnets - can't access across subnets

Hey all, I'm having an issue with multiple routers and subnets on my FIOS connection. Here's how everything is setup:
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ActionTec MI424WR Rev D (from Verizon)
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WAN NETMASK: From ISP
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WAN NETMASK: 255.255.255.0
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So, I added the following static route to the primary router:
DESTINATION: 192.168.2.0
NETMASK: 255.255.255.0
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Once this was added to the router, I could ping everything, so that was good. However, even though .1 can now ping .2, I can't access certain things such as the web interface of my NAS (192.168.2.2). I can ping it, but accessing it in the browser from .1 doesn't work; however, accessing from .2 does work.
I think the ActionTec router might be blocking it, but that's just a guess. The firewall on this thing has me thoroughly confused. Currently, I have 192.168.1.2 in the DMZ on the ActionTec, but that didn't make a difference. I've also completely disabled the firewall on the secondary Belkin router, but still nothing.
Any help from the pros here? Much appreciated!
Solved!
Go to Solution.

Ok, I figured it out and everything is now working. The issue appears to be that the ActionTec router doesn't recognize traffic from Subnet 1 to Subnet 2 as internal traffic -- it treats it as external traffic and closes it off. To fix this, it required some Advanced Firewall Filters that were far from unituitive and took a lot of testing to get it just right. If anyone runs into a similar situation in the future, here's a rundown of what I did to make it all work:
Primary Router:
ActionTec, MI424WR Rev D
WAN IP/NETMASK:Assigned by ISP
LAN IP/NETMASK:192.168.1.1 / 255.255.255.0
Secondary Router:
Belkin N750 Gigabit w/ 802.11n
WAN IP/NETMASK:192.168.1.2 / 255.255.255.0
LAN IP/NETMASK:192.168.2.1 / 255.255.255.0
Plug Secondary router's WAN port into a LAN port on the Primary router.
Setup Secondary router to have static LAN address (192.168.1.2)
At this point, you should have 2 separate subnets: Subnet 1 (192.168.1.*) and Subnet 2 (192.168.2.*).
Systems on both subnets should be able to reach the internet. Also, Subnet 2 should be able to ping and reach systems on Subnet 1; however, systems on Subnet 1 should not be able to ping or reach systems on Subnet 2. For this, we need to create a static route so Subnet 1 can reach Subnet 2.
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2.Set Description to 'Subnet 1'.
3.In Items section below, click Add.
4.Set Network Object Type to 'IP Subnet'.
5.Set Subnet IP Address to 192.168.1.0.
6.Set Subnet Mask to 255.255.255.0.
7.Click Apply. You are now back on Edit Network Object screen.
8.Click Apply. You are now back on Network Objects Screen.
9.Repeat the above steps again, but this time creating a second network object called 'Subnet 2':
Nameubnet 2
IP Subnet:192.168.2.0
Subnet Mask:255.255.255.0
Now we create the firewall rules. Go to Firewall Settings > Advanced Filtering.
In the Inbound/Input rules section, click the Add link next to Network (Home/Office) Rules.
Create the following Advanced Filter:
SOURCE ADDRESSelect 'Subnet 1'
DEST. ADDRESSelect 'Subnet 2'
PROTOCOL:'Any'
OPERATION:'Accept Packet'
OCCUR:'Always'
Click Apply. You will now be back on the Advanced Filtering page.
In the Outbound rules section, click the Add link next to Network (Home/Office) Rules.
Create the following Advanced Filter:
SOURCE ADDRESSelect 'Subnet 1'
DEST. ADDRESSelect 'Subnet 2'
PROTOCOL:'Any'
OPERATION:'Accept Packet'
OCCUR:'Always'
Click Apply. You will now be back on the Advanced Filtering page.
Click Apply.
You're all done. You should now have internet access on both subnets, be able to ping across subnets and also be able to access services across subnets (local webservers, SSH, telnet, mail, etc). You will not be able to see network file shares across subnets in Windows, however, as this requires a WINS server (which is well outside the scope of this post). For instance, I have a Western Digital NAS on the 192.168.2.0 subnet that I can access as \\Mybooklive\ from within Subnet 2; on Subnet 1, however, I have to access it by its IP \\192.168.2.10\.

I-Series chipsets netbooting across subnets

Hello all,
Is anyone having issues attaching to tftp served netinstall images across subnet's with i-series hardware? Here's the situation, the netinstall.dmg was created form a factory build core i7 macbook pro mid 2012. Imaging on the same subnet as the server works fine for all hardware type. Older hardware, for example core2duo or xenon's, can image iacrros subnet's and on the servers subnet without issue. The problem only appears to occur when imaging an i-series device across subnet's. Anyone have any ideas? Could really use some help here.
Thanks

Hi Steve,
While in most sites I have them in the same subnet there is a site where they are in 2 subnets. I was hoping to be able to make the roam seamless. If you have to disable and enable the wireless or perform an ipconfig /renew it takes away from the seamlessness :-).
Any suggestions would be welcome. However, I can understand what Scott is saying also as that is how it currently works.
The environment consists of all Anonymous AP various Aironent 1200 series, i.e. 100, 1250, etc.

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