Routing with a multihomed Mac

Hi,
I have a Mac running Leopard 10.5.4 with two network cards in it, and I'm trying to get it to act as a router.
The setup is very simple:
A ---- M ---- B
M is the Mac with two nics.
The nic (en0) on computer M connected to computer A has an IP of 10.0.0.1/24.
Computer A has an IP of 10.0.0.2 and a gateway of 10.0.0.1
The nic (en1) on computer M connected to computer B has an IP of 192.168.0.1/24.
Computer B's IP is 192.168.0.2 with a gateway of 192.168.0.1
Both computer A and B can ping computer M on the appropriate interface, but I cannot get computers A and B to ping each other. It sounds to me like computer M simply isn't forwarding the packets across its interfaces.
The routing table on computer M shows entries for both subnets on the appropriate en0/en1 interface.
There are no firewall rules at all on any of the machines (so nothing is blocking the ping).
Is there something I need to do to tell Leopard to forward traffic across its two network cards?
For the record: there is no NAT going here at all, and this has nothing to do with internet connection sharing. This is an isolated little network with only three machines; no net connection, no NAT, no nothing. All I want is for machine M to do some routing for me
Can anyone help?
Thanks in advance.
Hamster.

It sounds to me like computer M simply isn't forwarding the packets across its interfaces
That's correct. By default the OS doesn't forward packets, only accepts packets destined for itself.
Is there something I need to do to tell Leopard to forward traffic across its two network cards?
Yes. Enable IP forwarding:
sysctl -w net.inet.ip.forwarding=1
Note this will be transient (i.e. lost at next reboot). To make it persistent add the 'net.inet.ip.forwarding=1' to /etc/sysctl.conf

Similar Messages

I am trying to connect a Windows 7 / 64 bit to an Epson printer on my Mac. The printer is hooked into the Mac via USB; the Mac is networked to a Linksys wireless router with an ethernet cable, as is the Windows box. Any tips on how to do this?

I am trying to connect a Windows 7 / 64 bit to an Epson printer on my Mac. The printer is hooked into the Mac via USB; the Mac is networked to a Linksys wireless router with an ethernet cable, as is the Windows box. I installed the current Bonjour printer services software on the Windows machine, and separately installed the driver software for the Epson printer on the WIndows machine. Running the bonjour wizard, I get an alert saying 'I don't have sufficient access to my computer to connect to the selected printer'.
The printer has 'sharing' turned on from the Mac end; this works with a Powerbook via the wireless connection. Sharing is also turned on in the Windows printer control panel for this printer (under properties). The Mac is a G5 running 10.5.8. When I try to print a page from the Windows machine it gets hung in the print queue.
Any advice how to proceed would be appreciated!
thx,

I am trying to connect a Windows 7 / 64 bit to an Epson printer on my Mac. The printer is hooked into the Mac via USB; the Mac is networked to a Linksys wireless router with an ethernet cable, as is the Windows box. I installed the current Bonjour printer services software on the Windows machine, and separately installed the driver software for the Epson printer on the WIndows machine. Running the bonjour wizard, I get an alert saying 'I don't have sufficient access to my computer to connect to the selected printer'.
The printer has 'sharing' turned on from the Mac end; this works with a Powerbook via the wireless connection. Sharing is also turned on in the Windows printer control panel for this printer (under properties). The Mac is a G5 running 10.5.8. When I try to print a page from the Windows machine it gets hung in the print queue.
Any advice how to proceed would be appreciated!
thx,

Any Idears on how to use my D-Link Router with Print Server on my mac ?

I just got recently a D-Link Router with Print Server.
The Model is a DI-704UP. does anyone know how i can access the printer to my G5 ?
talked to D-Link and Apple and they have no solution.
IMac G5 Mac OS X (10.4.6)

According to this page on the D-Link website about your product, the router includes a print server for Windows and that the software is for Windows only.
However, this page also on D-Link's website does offer you an unsupported solution.
Hope this helps! bill
1 GHz Powerbook G4 Mac OS X (10.4.6)

I have an old PowerPC and a Macbook Pro running 10.6.7 sitting side by side. Both are using AirPort to connect to the internet wirelessly to the same router, but the old Mac connects with full bars, but the MBP struggles with only 2. Pls help, thanks!

I have an old PowerPC running 10.4.11 and a Macbook Pro running 10.6.7 sitting side by side. Both are using AirPort to connect to the internet wirelessly to the same wireless router. The old Mac connects with full bars but the MBP struggles with only 2 bars. Pls help, thanks!

BDAqua,
Thanks for the response.
Apple has used the term "Digital Audio" to identify this machine. System Profiler has the following information:
Machine Name:          Power Mac G4
Machine Model:          PowerMac3,5
CPU Type:          PowerPC G4 (2.1)
Number Of CPUs:          1
CPU Speed:          800 MHz
L2 Cache (per CPU):          256 KB
Memory:          768 MB
Bus Speed:          133 MHz
Boot ROM Version:          4.3.3f2
Serial Number:          XBxxxxxMK9
Sales Order Number:
Yes, I could connect them by ethernet if all I wanted to do was transfer files, but I would like to network them so I could use wireless internet. The machines are not always so close together, I did that to simplify the testing. With the very slow transfer speeds I am reluctant to move ahead with the internet step.
<Edited By Host>

Problem with facetime for mac

hello guy! I've got a problem with facetime for mac.My sister has a I-pod touch fourth generation with factime but i cna't phone her a message come on my mac.It say "xxx can't receive facetime's calls"!Can you help me??

Thanks, Dah•veed.
I did see mention of using Google Public DNS while I was searching the forums prior to posting, but to be honest didn't think it was a DNS-related problem.
However, to rule it out I've set the prefered DNS servers on my router to Google's, but FaceTime still disconnects after 4-5 seconds when calling between me and my brother-in-law. It doesn't matter who initiates the call.
As a test, before I made the changes to my router, I logged into FaceTime as him on my MBP and tried calling myself on my iMac, and that was successful.
The same test between the two iMacs when they were here was unsuccessful, so now I'm definitely thinking it's something on the '08 iMac.
Now I just need to figure out what...

Having trouble setting up an Ad Hoc network with both iOS, Mac OS, and Windows.

So I'm skiing with some friends but we forgot to bring a router with us. The lodge internet is passable but we only have one ethernet connection. My friend connected his (windows) laptop to the ethernet and set up an Ad-Hoc network. The problem is that only Mac OS and iOS devices are able to connect to the network and use the internet. The windows machines and Droid devices can't connect or in some cases they can connect they can't use the internet.
My question is what special wizardry allows Mac OS and iOS to work fine on the ad hoc network but not the other platforms? Is there something I can do to get the other machines to connect to the network? Would things work better if I hosted the Ad Hoc network? Thanks for all the help.

Hi Munkiez, and a warm welcome to the forums!
See if this helps about halfway down is Wifi/Airport.
http://www.macworld.com/article/46658/2005/09/octmobilemac.html

How to extend a wifi network of third party router with TC 4th generation?

After searching the communities for a while, I did not find a definitive answer on the following question:
- I recently bought a 4th generation Time Capsule 2TB (MD0322/A), that I also want to use as an extension for our existing wifi network.
- This wifi network is maintained by a Sitecom Wireless 300N XR Gigabit Router. Router is set to work over 2.4 GHz (B+G+N) because of several non-N-wifi devices in the network. The channel in use is currently 11.
- This router provides so called WDS functionality, i.e. the ability for other wifi access points to act as a seamless extension of the basic wifi network (using the same SSID).
- The security settings in the router are WPA2 Mixed, with a password in plain ASCII.
- There seems to be no way to set different security levels for WDS-connections versus normal AP (access point) connections. If WDS is enabled, the security settings of the AP-mode are extended to the WDS connection.
I have set the Sitecom router to enable WDS, and added the MAC-address of the TC in the configuration of this router.
When configuring the Time Capsule, with Airport Utility 5.5.3, I can select the option to use TC to extend an existing network, and I can select the network of choice using the WPA personal or WPA/WPA personal security. However, the TC does not succeed in extending the network, and reports this back. If I manually configure the TC and select the network of choice, Airport Utility reports back that the selected network cannot be extended.
I have read several times in other posts that Time Capsule can only connect to third party routers via WDS using WEP-authentication, but these posts were quite old. I was wondering if this is still the case, or that Apple has updated this functionality in newer versions of TC, and thus there could exist a trick to connect to a WDS using WPA.
I really would appreciate suggestions
Bram Bos

gilles13 wrote:
I have a mac and pc (win7) both are connected thru a network with wifi and allready two access pt.
Airport can not be used to extend a WiFi created by a non-Apple box.
You need to turn off the radio in the router (shut down the existing WiFi). Purchase TWO Airport Express units. Connect one to the router with an Ethernet cable. Configure that one as your primary WiFi network and then use the second Express as the extender.
You need to locate the second Express where it receives a decent WiFi signal. Too far away and it has nothing to extend. Too close and it doesn't buy you anything. Before you plug in the second Express, check to see where the primary WiFi disappears completely. My personal WAG is that you want to locate the second Express 2/3 the distance to that point.
If you use Airport Utility to configure the units, it's a snap. In fact, if you configure the primary first and the extender second, AU will default to exactly the settings that you want.
By the way, I refereed to the Express because it's less expensive than the Extreme and you didn't indicate any need for the Extreme features.

Can you use an external antenna with the 4G LTE Router with Voice?

I live in a black hole of cell service - very rural, in a valley surrounded by trees, no DSL, no cable, no other options except satellite internet which I did for 15 years and will never do again. My current data setup is a Pantech UML290 USB modem connected to a Cellphone-Mate full band outdoor Omni 3G/4G antenna on the roof. I just ordered an amplifier to boost the 4G LTE connection. The modem is plugged into a Cradlepoint MBR900 router, which then provides my home internet (way more than 10 devices, and mostly wired).
Is there a way to add the antenna and amplifier setup to the broadband router with voice so I can be assured of the signal? If so, could I then use this router to feed the Cradlepoint and continue using multiple wired devices?
I was set to order this router last night, but the CSR through chat told me that you cannot attach antenna to the router with voice - only to the one with data. This really doesn't make any sense to me, but she was firm about it. If I can attach, can I use the cables I have or will I need a different adapter?
There is so little information about this particular router. My current setup is doing fairly well, but I would love the option to drop my landline and increase signal strength for both voice and data. With no antenna, the modem gets around -125 db, and can't connect at all. With the antenna mounted on the roof, and routed through the Cradlepoint, I consistently get -85 db. 4G LTE speeds are around 15-19 Mb/s down and very inconsistent 2.5-4.0 Mb/s up. However, the 4G drops and resets multiple times a day, so I usually sacrifice the speed to get a more stable 4.5-5 Mb/s down and 0.5 Mb/s up through forced 3G.
Voice calls are spotty if received at all, and frequently drop immediately if there is any connection. And of course, the data limit has been a nightmare. I could potentially save some money by porting my landline to Verizon, but not if there is no way to boost the signals. The Omni antenna will boost all, but not sure if there's any way to route the existing antenna setup to feed both the voice and data sides, or if it would be enough to allow me to do this. This router also says it's 4G LTE only, but the specs on the antenna they sell say it boosts 3G for failover, so not sure if it will grab anything else. Any help or advice GREATLY appreciated! Thanks for reading through the whole thing.

No, not directly. You would need to transfer your data from your iPad to your Mac and then back it up to an external drive.
Pete

I have an HP Laserjet 5m monochrome printer that I have used for years with our three Mac computers

HP Laserjet 5m monochrome printer C3917A (1997)
Operating system: OSX 10.7.4
Error message: Printer busy
No known changes made to system or configuration
I have an HP Laserjet 5m monochrome printer that I have used for years with our three Mac computers (two on OS X Lion and one on Leopard). I'm using ethernet to connect to a router and then my computer (although I have also tried to connect directly to no avail.) We went away for 2 weeks, returned and got “Printer busy” for all 3 computers. I reset the printer to factory settings. Same problem. By the way, the printer says READY. I then went to System prefs and clicked ‘–‘ in the Print & Scan section to remove the printer. When I tried to add back the printer, nothing shows up. I now remember that this may be because the means of communicating with the printer has now changed and that I had found the printer by somehow adding its address settings (or something). Can anyone help me to reconnect with the printer?
This question was solved.
View Solution.

Download and install this: http://support.apple.com/kb/DL907
Reset the printing system:
- Go to System Preferences > Print & Scan
- Right (or control) click in the rectangle listing your printers and select Reset Printing System.
WARNING - this will delete ALL of your printers!
- Select the plus sign to re-add a printer. Select the Defualt tab on the top of the window. Look for the printer, select it and wait until the "Add" button becomes available. Click it.
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP

Frustrated - Can't connect to router with laptop after disconnect, other devices work fine.

I have a RevI Actiontec router with dual antennas(not sure of firmware as I am not at home). My wife can be on her laptop all day, then when I come home with my IPad, it make her lose connection to the router. The router still connects to my iPhone 4 and iPad (both with iOS 6.0.1), but she is unable to connect to router at all. Everything continues to function normally on my Apple devices, so we are still connected to the internet. I have a laptop as well, and when this is happening, both of the laptops stop connecting, but the apple devices and our Toshiba TV and BluRay players continue to function normally. As a temp fix, I disconnect internet from my iPad and restart the router. It works until we try to run both at the same time.
I am mildly computer literate, though I know little about network setups beyond security, MAC filtering, and other slightly advanced setup stuff.
This is really frustrating and seems to be getting worse. We used it like this in our new house for several months before this started happening.

Also check to make sure neither of the devices are set to use a static IP address.
If a forum member gives an answer you like, give them the Kudos they deserve. If a member gives you the answer to your question, mark the answer as Accepted Solution so others can see the solution to the problem.
"All knowledge is worth having."

ITunes Library set up on NetGear R6100 router with ReadyShare from USB port?

Can the iTunes Library be set up on a NetGear R6100 router with it's NetGear ReadyShare feature. from a USB thumb drive or USB hard drive attached to the one available R6100 router's USB 2.0 port?
I have read the Apple forum post about a similar question for the more advanced NetGear R7000 router, which says it can work there. Unlike some of the other sibling Netgear routers that do not have ReadyShare, my R6100 does, which leads me to believe that it should work, since its the same technology (they both have a router USB port with ReadyShare). It just appears that the documentation is very limited. The other post said to format the USB drive to the Apple format (HFS+), rather than Fat32, get the Mac or Apple to see the iTunes directory located on the router's USB port.
I'd like to know if anyone has had any luck using the ReadyShare.feature on their R6100 for sharing their iTunes library to the same iTunes account on different devices (laptop, PC, AppleTV, iPod, etc). My Apple TV has recently acquired a problem of not being able to detect the iTunes library on my PC, aftert a recent iTunes update, but that's another problem that the forums show a lot of people having. So I figured that since my R6100 router has the ability to share media over the network, I would try to move my iTunes library there, hopefully to make it easier to access by my Apple TV, and make it unnecessary to have my PC running when I watch my purchased iTunes movies, that are stored in that library. Interestingly, my movie and TV show files are stored in my iTunes Music folder under the "Movies" and "TV Shows" subdirectories (folders). The way it is set up now, if I'm watching a HD movie purchased from iTunes with my Apple TV, the movie stops playing as soon as my PC is shut down, which confirms to me that the large movie files are being pulled from there to my Apple TV.

Oh groan, not another conspiracy theory. No, it's a lot more likely Apple and Netgear and the dozens of other manufacturers haven't gotten together with the thousands users who have come up with hundreds of thousands of ways of rigging things up and tested each and every one of them. I am confident if Apple were out to mess things up for you they could have come up with something a lot more devious.
Did you do a web search for this? With a Google search specifying Netgear with this error I found:
ReadySHARE USB Hard drive access issue from a Mac Computer (Time Machine or iTunes not working properly)
- Able to see USB hard drive content but unable to write to USB hard drive connected to router's Readyshare port from Mac computer.
- Error that says "The iTunes application could not be opened. Unknown error 13008"
http://kb.netgear.com/app/answers/detail/a_id/22763/~/readyshare-usb-hard-drive- access-issue-from-a-mac-computer-%28time-machine-or
In fact it is almost certain that it is an issue of that particular model router and the drive formats it can use.

Wireless Router with USB + External Hard Drive = Time Capsule?

So I bought a TP-Link WR710N wireless router http://www.tp-link.com/en/products/details/?model=TL-WR710N which seems to support external storage in its USB port. I tried with various storage media and it kinda works. The bad thing is that it only sees NTFS drives. I tried an external hard drive formated for Windows and a USB stick, also formated for Windows and it discovered them. But when I tried my external hard drive which is formatted as Mac OS Extended (Journaled), which I was using for Time Machine, it couldn't see it. Neither the TP-Link software, nor the Time Machine software.
Is there any way I could use this router with this hard drive for wireless backing up with Time Machine NOT buying extra equipment (NAS, AirPort Extreme or Time Capsule) ?
Thanks.

m3adi3c wrote:
Is there any way I could use this router with this hard drive for wireless backing up with Time Machine NOT buying extra equipment (NAS, AirPort Extreme or Time Capsule) ?
Thanks.
No
Take it back and get a Time Capsule or keep it and buy a regular external drive and connect it to the Mac directly.

How To Use Your Own Router with Out Loosing Verizon's FIOS Services

How to use your own router with Verizon’s FIOS Service
First, you need a basic understanding of how FIOS works but unfortunately there are two types of FIOS systems out there. All of the systems utilize a fiber optic cable to bring TV, phone and internet to your location over one optic cable. In addition these systems provide interactivity including widgets, remote DVR, movies on demand and so forth via an IP (Internet Protocol) signal. Your STB (Set Tip Box) requires both a video and IP signal. The IP signal is necessary for all of the aforementioned interactivity. The fiber cable terminates at the Optical Network Terminal or ONT for short. The ONT converts the optics into a digital signal that can be utilized by ones equipment. From the ONT your video, phone and internet are provided to the location. This is where things can differ as the internet signal can be provided via a coaxial (MoCA or Multimedia over Coax Alliance) or RJ45 Cat5 (Ethernet) cable. It is important to identify and understand the differences of these two setups. In my case I have my internet entering via Ethernet cable, which in my humble opinion makes things a heck of a lot easier.
How does one tell the difference? In most cases it’s rather simple; just look at the Verizon’s router WAN (Wide Area Network) Port. Does it have a RJ45 (Ethernet) or Coax (TV cable Cord) going to it? If the router’s WAN port doesn’t have a coaxial connector then one will need to convert the MoCA signal into a usable Ethernet signal that routers understand. The easiest way is to use Verizon’s router as a bridge. In this method the Verizon’s router simply converts the signal and passes it along to your own router. The challenge is to try to maintain the interactivity that FIOS TV provides. Because of this one needs to supply the IP routed signal back to the FIOS router. There are multiple methods for doing this and I would recommend investigates which one make the most sense.
In my particular case the IP signal was provided by Ethernet. Again there are various ways of installing one’s own router. The hardest is to utilize Verizon’s router as a bridge. This setup requires configuring Verizon’s router as a bridge and also creating a VLAN (Virtual Local Area Networks). In addition one needs to set up their own router so it will work with the various routing tables and networks. For me this is too complex for the average person and it can be difficult to trouble shoot if something goes wrong. Please consider that Verizon will not support utilizing third party routers.
The easier method is to request an Ethernet signal (if you don’t already have one) from their ONT. I would highly recommend getting your hands on a NIM or Network Interface Module. This device is used to convert Ethernet to Coaxial so it can be fed back to your STBs. These can be purchased online and Verizon technicians can be a valuable resource with these sorts of acquisition. At the very least they can point you to the right direction. Once you have a NIM the rest is rather simple.
Log into the current Verizon Router.
Located the router’s MAC address and copy it down.
Go to the port forwarding section and copy down the Applied Rules.
Example:
Network Computer/Device: 192.168.1.100:63145
Application & Ports Forward: Application UDP Any -> 6347
Note: There may be up to three entries for each one of your Set Top Boxes.
Look at your current device list, typically found on the home screen. Copy down your STB MAC and IP address.
Example:
IP-STB1
Connection Type: Ethernet
* IP Address: 192.168.1.100
IP Address Allocation: DHCP
*MAC Address:                07:73:fFe:ad:8b:3f
* Things you will need to write down
Go to the network section and look for the main Ethernet connection. Select this and then select more setting, typically found at the bottom. Release the current lease.
Remove the Verizon router
Install your router
Connect the NIM by plugging in an Ethernet from one of the routers LAN (Local Area Network) ports to your NIM. Then connect the coax cable, the same cable that was used by Verizon router.
Set you DHCP routing IP pool to accommodate Verizon’s STB IP’s (note their IP’s start at 192.168.1.100)
Go to DHCP section and reserve the STB IP’s by inserting the IP’s and MAC addresses. This shall ensure that nothing else utilizes the same IPs as the STBs thereby preventing IP address conflict.
Add the port forwards from Step 5 above.
Clone Verizon’s Mac Address utilizing the info from step 2
Finish setting up the router in typical fashion.
Unplug and re-plugin your STB’s and test functionality. It’s best to try using a widget or Movie on demand function.
Note: if the new router can net get an internet signal contact Verizon’s support and have them release the IP and reset the ONT.
EVERYTHING should be working at this point.

3 Go to the port forwarding section and copy down the Applied Rules.
Example:
Network Computer/Device: 192.168.1.100:63145
Application & Ports Forward: Application UDP Any -> 6347
Note: There may be up to three entries for each one of your Set Top Boxes.G
Your display obviously is not like mine as mine does not dosplay the port associated with the ip address
whatever, the STB's start at 192.168.1.100 and icement by 1 for each
the port addr's will be 63145 alo incrementing by 1
there is 1 entry for each in my pf list
however each ip addr also has a port entry starting at 35000 also incrementing by 1 for each ip addr
For some unknow reason these are duplicated e.g I appear to have 11 entries exaactly the same for each stb and as the fios services rules have no action switc there is nowhere to delete the extraneous garbage.
Why do you clone the mac addr??

Do I need a wireless card to use a router with my iMac or does the built in

I am having ComCast install a router at my home and they tell me I'll need a wireless card. I shouldn't need one with Airport Extreme installed should I?

Right - sort of.
You do need a wireless card to connect to a wireless router. However your Mac already has built-in wireless (almost every iMac does, only the original from 1998 didn't) so you're good to go - you don't need any extras.

Using linksys wired router with AE 2nd generation

Hi. I'm trying to use a linksys befsr41 (non-wireless 4 port router) with a 2nd generation airport express. I have several wired rooms that I want to setup separate networks with other AE's. My configuration is: cable box-->AE WAN in--AE LAN out-->Linksys-->ethernet cable through the house—>AE WAN in rooms. Can’t seem to make this work. I can do it wirelessly (i.e having the remote AE's joing the first AE network) but several of the rooms have poor signal. As soon as I try and create a new network the remote AE’s can’t connect to the network. I checked the cables and they are all good.
Thanks.

We need some additional information to be able to troubleshoot this issue.
Can you provide the make and model number of the cable modem that you are using?
Are the other AirPort Express devices that you are trying to connect also 2nd Gen versions? If not, what version are they?
The Linksys router needs to be configured to operate in Bridge Mode so that it will function as if it were an Ethernet switch.....not a router. Is the Linksys set up in Bridge Mode at the current time?
Looking at the Linksys support forum....example below......I cannot tell whether it is possible to configure the Linksys product in Bridge Mode:
https://community.linksys.com/t5/Wired-Routers/Use-BEFSR41-in-Bridged-Mode/td-p/ 272061
Are you trying to configure the AirPorts using AirPort Utility on a Mac....or on an iPhone / iPad? If you are using a Mac, what operating system is the Mac running? If you are not sure, click the Apple icon in the upper left corner of the screen, then click About This Mac. Post back with the OS X version that you see there.

Routing with a multihomed Mac

Similar Messages

Maybe you are looking for