OpenBSD configuration interfaces network routing Configure Network on OpenBSD Introduction I won't go into too much detail, as that's what the OpenBSD website is for. This is just a quick reference for recalling how to rapidly configure networking.
Basic Configuration ifconfig To list available network cards and view defined IP addresses:
$ ifconfig
lo0: flags = 8049 <UP,LOOPBACK,RUNNING,MULTICAST> mtu 33224
inet 127 .0.0.1 netmask 0xff000000
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
lo1: flags = 8008 <LOOPBACK,MULTICAST> mtu 33224
fxp0: flags = 8843 <UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
address: 00 :04:ac:dd:39:6a
media: Ethernet autoselect ( 100baseTX full-duplex)
status: active
inet 10 .0.0.38 netmask 0xffffff00 broadcast 10 .0.0.255
inet6 fe80::204:acff:fedd:396a%fxp0 prefixlen 64 scopeid 0x1
pflog0: flags = 0 <> mtu 33224
pfsync0: flags = 0 <> mtu 2020
sl0: flags = c010<POINTOPOINT,LINK2,MULTICAST> mtu 296
sl1: flags = c010<POINTOPOINT,LINK2,MULTICAST> mtu 296
ppp0: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1500
ppp1: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1500
tun0: flags = 10 <POINTOPOINT> mtu 3000
tun1: flags = 10 <POINTOPOINT> mtu 3000
enc0: flags = 0 <> mtu 1536
bridge0: flags = 0 <> mtu 1500
bridge1: flags = 0 <> mtu 1500
vlan0: flags = 0 <> mtu 1500
address: 00 :00:00:00:00:00
vlan1: flags = 0 <> mtu 1500
address: 00 :00:00:00:00:00
gre0: flags = 9010 <POINTOPOINT,LINK0,MULTICAST> mtu 1450
carp0: flags = 0 <> mtu 1500
carp1: flags = 0 <> mtu 1500
gif0: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1280
gif1: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1280
gif2: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1280
gif3: flags = 8010 <POINTOPOINT,MULTICAST> mtu 1280
Here's a listing of available interfaces with their explanations:
lo - Loopback Interface pflog - Packet Filter Logging Interface sl - SLIP Network Interface ppp - Point to Point Protocol tun - Tunnel Network Interface enc - Encapsulating Interface bridge - Ethernet Bridge Interface vlan - IEEE 802.1Q Encapsulation Interface gre - GRE/MobileIP Encapsulation Interface gif - Generic IPv4/IPv6 Tunnel Interface carp - Common Address Redundancy Protocol Interface Setting a Permanent IP Simply create a file /etc/hostname.interface_name
and insert the IP and subnet mask:
echo "inet 172.16.1.100 255.255.255.0 NONE" > /etc/hostname.fxp0
Default Gateway To set your default gateway (or default route), create the file /etc/mygate
and specify the desired IP:
echo "172.16.1.254" > /etc/mygate
DNS To set DNS servers, it's quite simple, as in all Unix-like systems, edit the resolv.conf file:
search example.com
nameserver 125 .2.3.4
nameserver 125 .2.3.5
Hostname To define a machine's hostname, simply insert the desired name in the /etc/myname
file:
echo "server" > /etc/myname
Applying Changes Without Rebooting Obviously, you don't need to restart the machine, but you do need to restart the network services! To restart network services:
$ 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
Routes To display routes:
or
Finally, to add static routes, here's an example of an /etc/hostname.if
file (adapt to your needs):
inet 192 .168.254.254 255 .255.255.0 NONE !
route add 10 .0.0.0 192 .168.254.1
Network Tuning If you want to increase bandwidth performance, you can activate it via sysctl. To test temporarily:
sysctl net.inet.tcp.recvspace= 65536
sysctl net.inet.tcp.sendspace= 65536
To make it permanent, add these lines to /etc/sysctl.conf
:
echo "# Increase performance" >> /etc/sysctl.conf
echo "net.inet.tcp.recvspace=65536" >> /etc/sysctl.conf
echo "net.inet.tcp.sendspace=65536" >> /etc/sysctl.conf
Resources March 17, 2008 March 17, 2008