Introduction link
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 link
ifconfig link
To list available network cards and view defined IP addresses:
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| $ 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
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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 link
Simply create a file /etc/hostname.interface_name
and insert the IP and subnet mask:
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| echo "inet 172.16.1.100 255.255.255.0 NONE" > /etc/hostname.fxp0
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Default Gateway link
To set your default gateway (or default route), create the file /etc/mygate
and specify the desired IP:
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| echo "172.16.1.254" > /etc/mygate
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To set DNS servers, it’s quite simple, as in all Unix-like systems, edit the resolv.conf file:
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| search example.com
nameserver 125.2.3.4
nameserver 125.2.3.5
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Hostname link
To define a machine’s hostname, simply insert the desired name in the /etc/myname
file:
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| echo "server" > /etc/myname
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Applying Changes Without Rebooting link
Obviously, you don’t need to restart the machine, but you do need to restart the network services! To restart network services:
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| $ 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
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To display routes:
or
Finally, to add static routes, here’s an example of an /etc/hostname.if
file (adapt to your needs):
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| inet 192.168.254.254 255.255.255.0 NONE !
route add 10.0.0.0 192.168.254.1
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Network Tuning link
If you want to increase bandwidth performance, you can activate it via sysctl. To test temporarily:
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| sysctl net.inet.tcp.recvspace=65536
sysctl net.inet.tcp.sendspace=65536
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To make it permanent, add these lines to /etc/sysctl.conf
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| echo "# Increase performance" >> /etc/sysctl.conf
echo "net.inet.tcp.recvspace=65536" >> /etc/sysctl.conf
echo "net.inet.tcp.sendspace=65536" >> /etc/sysctl.conf
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Resources link
Last updated
17 Mar 2008, 07:22 CET. history