The use field provides a count of the number of packets sent using that route. Expire is a timeout - a period in which the host doesn't respond to that route. MAC Address and Hardware Devices. The HEX address that you're seeing for the 10.1.0.10.1/32 network (bc:67:1c:40:3:f6) is a MAC. Video Showing how to run the Trace Route on Mac OS? Detailed instructions - https://www.pcrisk.com/computer-technician-blog/mac/12296-how-to-perform-a-trace. In the case above, the default gateway of this Mac is 192.168.20.1. Meaning all routes are pointing to that system. Posted by Jack Sep 20 th, 2016 mac, osx. May 04, 2019 To run traceroute on a Mac using the Terminal app 1 -Launch the Terminal app. To open the Terminal app, you can: Go to Finder Applications Utilities Terminal.
Question or issue on macOS:
I need to retrieve the default gateway on a Mac machine. I know that in Linux route -n will give an output from which I can easily retrieve this information. However this is not working in Mac OSX(Snow Leopard).
I also tried netstat -nr grep ‘default’, but I was hoping for a cleaner output like that produced by route -n in Linux/Unix. netstat -nr lists all the interfaces and the default gateway for them.
Any kind of suggestion or a hint in the right direction will be appreciated.
How to solve this problem?
Solution no. 1:
You can try with:
It is not the same as GNU/Linux’s route -n (or even ip route show) but is useful for checking the default route information.
Also, you can check the route that packages will take to a particular host. E.g.
The output would be similar to:
IMHO netstat -nr is what you need. Even MacOSX’s Network utility app(*) uses the output of netstat to show routing information.
I hope this helps 🙂
(*) You can start Network utility with open /Applications/Utilities/Network Utility.app
Solution no. 2:
For getting the list of ip addresses associated, you can use netstat command
This gives a long list of ip addresses and it is not easy to find the required field. The sample result is as following:
The ip address of gateway is in the first line; one with default at its first column.
To display only the selected lines of result, we can use grep command along with netstat
This command filters and displays those lines of result having default. In this case, you can see result like following:
If you are interested in finding only the ip address of gateway and nothing else you can further filter the result using awk. The awk command matches pattern in the input result and displays the output. This can be useful when you are using your result directly in some program or batch job.
The awk command tells to match and print the second column of the result in the text. The final result thus looks like this:
In this case, netstat displays all result, grep only selects the line with ‘default’ in it, and awk further matches the pattern to display the second column in the text.
Mac Os Versions
You can similarly use route -n get default command to get the required result. The full command is
These commands work well in linux as well as unix systems and MAC OS.
Solution no. 3:
The grep utility is not needed. Awk can do it all:
Note that if you have something like Parallels (or a VPN, or both) running, you may see two or more default routing entries – it will be true if you use the ‘grep’ suggestion above, too.
and
To set a variable (_default) for further use (assuming only one entry for ‘default’) …..
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In the case of multiple default routes use:
These examples tested in Mavericks Terminal.app and are specific to OSX only. For example, other *nix versions frequently use ‘eth’ for ethernet/wireless connections, not ‘en’.
This is also only tested with ksh. Other shells may need a slightly different syntax.
Solution no. 4:
I would use something along these lines…
Solution no. 5:
Using System Preferences:
Step 1: Click the Apple icon (at the top left of the screen) and select System Preferences.
Step 2: Click Network.
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Step 3: Select your network connection and then click Advanced.
Step 4: Select the TCP/IP tab and find your gateway IP address listed next to Router.