Hitchhiker's Guide to Openbsd

6.2.5 - Activating the changes
From here, you can either reboot or run the /etc/netstart script. You can do this by simply typing (as 
root): 
# sh /etc/netstart
writing to routing socket: File exists
add net 127: gateway 127.0.0.1: File exists
writing to routing socket: File exists
add net 224.0.0.0: gateway 127.0.0.1: File exists
Notice that a few errors were produced. By running this script, you are reconfiguring things which are 
already configured. As such, some routes already exist in the kernel routing table. From here your 
system should be up and running. Again, you can check to make sure that your interface was setup 
correctly with 
ifconfig(8)
. 
Even though you can completely reconfigure networking on an OpenBSD system without rebooting, a 
reboot is HIGHLY recommended after any significant reconfiguration. The reason for this is the 
environment at boot is somewhat different than it is when the system is completely up and running. For 
example, if you had specified a DNS-resolved symbolic name in any of the files, you would probably 
find it worked as expected after reconfigure, but on initial boot, your external resolver may not be 
available, so the configuration will fail. 
6.2.6 - Checking routes
You can check your routes via 
netstat(1)
 or 
route(8)
. If you are having routing problems, you may want 
to use the -n flag to route(8) which prints the IP addresses rather than doing a DNS lookup and 
displaying the hostname. Here is an example of viewing your routing tables using both programs. 
$ netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs
Use Mtu Interface
http://www.openbsd.org/faq/faq6.html (6 of 33)9/4/2011 10:02:06 AM

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6 - Networking
default 10.0.0.1 UGS 0
86 - fxp0
127/8 127.0.0.1 UGRS 0
0 - lo0
127.0.0.1 127.0.0.1 UH 0
0 - lo0
10.0.0/24 link#1 UC 0
0 - fxp0
10.0.0.1 aa:0:4:0:81:d UHL 1
0 - fxp0
10.0.0.38 127.0.0.1 UGHS 0
0 - lo0
224/4 127.0.0.1 URS 0
0 - lo0
Encap:
Source Port Destination Port Proto SA
(Address/SPI/Proto)
$ route show
Routing tables
Internet:
Destination Gateway Flags
default 10.0.0.1 UG
127.0.0.0 LOCALHOST UG
localhost LOCALHOST UH
10.0.0.0 link#1 U
10.0.0.1 aa:0:4:0:81:d UH
10.0.0.38 LOCALHOST UGH
BASE-ADDRESS.MCA LOCALHOST U