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FreeBSD

Network stuff

Forcing link speed

 ifconfig em0 media 100BaseFX mediaopt full-duplex

parameter	description
autoselect	Enables auto-negotiation for speed and duplex.
10baseT/UTP	Sets 10Mbps operation. Use the mediaopt option to select full-duplex mode.
100baseTX	Sets 100Mbps operation. Use the mediaopt option to select full-duplex mode.
1000baseSX	Sets 1000Mbps operation. Only full-duplex mode is supported at this speed.
1000baseTX	Sets 1000Mbps operation. Only full-duplex mode is supported at this speed.
full-duplex	Forces full-duplex operation
half-duplex	Forces half-duplex operation.

working with routes (print routing table)

 netstat -rn

creating interface vlans

ifconfig vlan0 create
ifconfig vlan0 vlan 4 vlandev fxp0
ifconfig vlan0 inet a.a.a.a netmask x.x.x.x up

Globetrotter UMTS Card

cd /usr/ports/comm/hso-kmod/
make install clean
kldload hso
hsoctl -n -a internet -p PIN hso0 -u mobitel -k internet

There is a problem with the code used from ports (at least for me it was). 
If you'll get disconnected right after connection, go to http://www.shapeshifter.se/code/hso/ and download/install the code manually. 
It's pretty trivial so no problems with it.

Firewalling

ipfw list

Firewalling IPv6 Below some rules of implementing firewall in FreeBSD. Using IPFW (please compile your kernel, if it’s not supported). It’s easy as IPv4.

# Simple Firewall :
(allow network 2404:170::/32 to any host)
ip6fw add 100 allow all from 2404:170::/32 to any in via fxp0

(allow network 2001:dc6::/32 to any host)
ip6fw add 200 allow all from 2001:dc6::/32 to any in via fxp0

(allow all ipv6 to host 2404:170:ee02::10)
ip6fw add 300 allow all from :: to 2404:170:ee02:ee02::10 in via fxp0

(deny other all traffic).
ip6fw add 1000 deny all from any to any in via fxp0

FreeBSD GRE tunnels

<code> b0x# kldstat Id Refs Address Size Name 1 5 0xc0400000 34f898 kernel 2 14 0xc0750000 56270 acpi.ko 3 1 0xc0c97000 1c000 ipl.ko 4 1 0xc15ef000 4000 if_gre.ko

# kldload if_gre.ko # sysctl -w net.inet.ip.gre_default_mtu=1450 # ifconfig gre1 create # ifconfig gre1 tunnel 217.154.12.2 212.25.240.34 # ifconfig gre1 mtu 1450 # ifconfig gre1 inet 10.1.12.38 10.1.12.37 netmask 255.255.255.252 # ifconfig gre1 up <code>

or

 # ifconfig gre1 inet 10.1.12.37 10.1.12.38 netmask 255.255.255.252 up
 # /usr/sbin/greconfig -i gre1 -v -s 212.25.240.34 -d 217.154.12.2

OpenBSD

Manual IPv6 configuration

 ifconfig rl0 inet6 2001:470:1f01:115::4 prefixlen 64  # add address
 ifconfig rl0 inet6 2001:470:1f01:115::4 delete        # remove address
 route -n add -inet6 default 2001:470:1f01:115::1      # default route

NetBSD

Basic config:

 ifconfig tlp0 inet6 2001:470:1f01:115::8 prefixlen 64  # add address
 ifconfig tlp0 inet6 2001:470:1f01:115::8 delete        # remove address
 route add -inet6 default default_ip6_gateway_addr      # default route

Setting up an IPv6-over-IPv4 tunnel:

 ifconfig gif0 create
 ifconfig gif0 tunnel local_ip4_addr remove_ip4_addr
 ifconfig gif0 inet6 local_ip6_addr remote_ip6_addr prefixlen /128

For more information on IPv6 and NetBSD, please consult the NetBSD IPv6 Networking FAQ

FruBSD

Going through heavy developing phase …