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How-to-check-ethernet-interface-before-netwrok-bonding

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June 01, 2008, at 07:24 AM by 117.97.55.10 -
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shibu@shibu-laptop:~$ sudo ifconfig -s
[sudo] password for shibu:

Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 0 0 0 0 15 0 0 0 BMRU
lo 16436 0 3014 0 0 0 3014 0 0 0 LRU
ppp0 1500 0 1612 0 0 0 1754 0 0 0 MOPRU

DESCRIPTION
Ifconfig is used to configure the kernel-resident network interfaces. It is used at
boot time to set up interfaces as necessary. After that, it is usually only needed
when debugging or when system tuning is needed.

If no arguments are given, ifconfig displays the status of the currently active inter‐
faces. If a single interface argument is given, it displays the status of the given
interface only; if a single -a argument is given, it displays the status of all inter‐
faces, even those that are down. Otherwise, it configures an interface.

Address Families
If the first argument after the interface name is recognized as the name of a supported
address family, that address family is used for decoding and displaying all protocol
addresses. Currently supported address families include inet (TCP/IP, default), inet6
(IPv6), ax25 (AMPR Packet Radio), ddp (Appletalk Phase 2), ipx (Novell IPX) and netrom
(AMPR Packet radio).

OPTIONS
-a display all interfaces which are currently available, even if down

-s display a short list (like netstat -i)

-v be more verbose for some error conditions


interface
The name of the interface. This is usually a driver name followed by a unit
number, for example eth0 for the first Ethernet interface. If your kernel sup‐
ports alias interfaces, you can specify them with eth0:0 for the first alias of
eth0. You can use them to assign a second address. To delete an alias interface
use ifconfig eth0:0 down. Note: for every scope (i.e. same net with
address/netmask combination) all aliases are deleted, if you delete the first
(primary).

up This flag causes the interface to be activated. It is implicitly specified if
an address is assigned to the interface.

down This flag causes the driver for this interface to be shut down.

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June 01, 2008, at 07:10 AM by 117.97.55.10 -
Added lines 1-51:
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*Here the network cable is not connected to the laptop

shibu@shibu-laptop:~$ sudo mii-tool
[sudo] password for shibu:
eth0: no link

----
*Once the cable is connected you can run the command once again..

shibu@shibu-laptop:~$ sudo mii-tool
eth0: negotiated 100baseTx-FD flow-control, link ok

----
shibu@shibu-laptop:~$ sudo ethtool eth0
Settings for eth0:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: MII
PHYAD: 24
Transceiver: internal
Auto-negotiation: on
Current message level: 0x00000001 (1)
Link detected: yes
----
*Search for bonding command as follows..

shibu@shibu-laptop:~$ sudo apt-cache search ifenslave

ifenslave - Attach and detach slave interfaces to a bonding device

ifenslave-2.6 - Attach and detach slave interfaces to a bonding device


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Page last modified on June 01, 2008, at 07:24 AM