Multiple IP addresses on one NIC and Multiple internet connections on one nic

isp isps nic ip alias ip aliasing multiple ips on one nic

Multiple Connections to the Internet / two isps on one nic

/etc/iproute2# cat rt_tables
#
# reserved values
#
255     local
254     main
253     default
0       unspec
#
# local
#
#1      inr.ruhep
82 sdsl
188 fibre


ip route add 82.94.91.64/28 dev eth0 src 82.94.91.77 table sdsl
ip route add default via 82.94.91.65 table sdsl
ip rule add from 82.94.91.64/28 table sdsl

ip route add 188.204.140.192/27 dev eth0 src 188.204.140.196 table fibre
ip route add default via 188.204.140.193 table fibre
ip rule add from 188.204.140.192/27 table fibre

to check:
ip rule show
ip route list table fibre
ip route list table sdsl

More information: http://linux-ip.net/html/adv-multi-internet.html#ex-adv-multi-internet-outbound-ip-

routing

http://www.policyrouting.org/iproute2.doc.html#ss9.5

ip address management with ip addr - http://linux-ip.net/html/tools-ip-address.html#tb-tools-ip-addr-scope

ip addr add 188.204.140.195/27 brd 188.204.140.223 dev eth1 label eth1:1

A lot on policy routing - http://www.policyrouting.org/iproute2.doc.html#ss9.5

ip link list - shows the physical devices

ip addr list - shows the adressees the links have

ip addr show dev eth0

Basic ip route - http://linux-ip.net/html/tools-ip-route.html

ip route list - like netstat -rn

/etc/iproute2/rt_tables - contains the routing tables