1. ifconfig (to find ethernet card name)
p5p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.1.10  netmask 255.255.255.0  broadcast 192.168.1.255
        inet6 fe80::c15d:1159:3654:2fc6  prefixlen 64  scopeid 0x20<link>
        ether 00:0a:f7:a4:13:18  txqueuelen 1000  (Ethernet)
        RX packets 349930173  bytes 29236710276 (27.2 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1149185442  bytes 16287580311793 (15.7 TiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2. dmesg | grep p5p1
[   14.659351] IPv6: ADDRCONF(NETDEV_UP): p5p1: link is not ready
[   14.697067] bnxt_en 0000:05:00.0 p5p1: NIC Link is Up, 10000 Mbps full duplex, Flow control: none
[   14.697072] bnxt_en 0000:05:00.0 p5p1: EEE is not active

3.ethtool p5p1
Settings for p5p1:
	Supported ports: [ TP ]
	Supported link modes:   1000baseT/Full 
	                        10000baseT/Full 
	Supported pause frame use: Symmetric Receive-only
	Supports auto-negotiation: Yes
	Supported FEC modes: Not reported
	Advertised link modes:  1000baseT/Full 
	                        10000baseT/Full 
	Advertised pause frame use: Symmetric
	Advertised auto-negotiation: Yes
	Advertised FEC modes: Not reported
	Speed: 10000Mb/s
	Duplex: Full
	Port: Twisted Pair
	PHYAD: 12
	Transceiver: internal
	Auto-negotiation: on
	MDI-X: Unknown
	Supports Wake-on: d
	Wake-on: d
	Current message level: 0x00000000 (0)
			       
	Link detected: yes

lshw -class network

Temporary:
Linux add a default route using route command

Route all traffic via 192.168.1.254 gateway connected via eth0 network interface:
# route add default gw 192.168.1.254 eth0
Linux add a default gateway (route) using ip command

Route all traffic via 192.168.1.254 gateway connected via eth0 network interface:
# ip route add 192.168.1.0/24 dev eth0

Persistent:
RHEL/CentOS/Fedora/Scientific Linux persistent routing configuration

Edit /etc/sysconfig/network and set default gateway IP address:
# vi /etc/sysconfig/network

Sample outputs:

## setup default gateway ##
GATEWAY=192.168.1.254

You can add additional static route for eth0 by editing /etc/sysconfig/network-scripts/route-eth0 file as follows:

192.168.12.0/24 via 192.168.1.56 dev eth0


The above config sets static routing for network 192.168.12.0/24 via 192.168.1.1 router.

The address 192.168.1.1 is the IP address leading to the remote network. It is preferably the next hop address but the address of the exit interface will work. The “next hop” means the remote end of a link, for example a gateway or router. The dev option can be used to specify the exit interface interface but it is not required. Add as many static routes as required. 



Debian / Ubuntu Linux persistence static routing configuration

Edit /etc/network/interfaces file, enter:
# vi /etc/network/interfaces

Append the following in eth0 section:

up route add -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.1.254
down route del -net 192.168.1.0 netmask 255.255.255.0 gw 192.168.1.254

Save and close the file.

Inital networking information comes from the udev rules. You can rename an interface by simply matching the nic name with the mac address.
Udev location:
/etc/udev/rules.d/70-persistent-net.rules

ping -M do -s 8972 [destinationIP]