Linux: Network Debugging - Revision history

David at 16:57, 10 August 2016

2016-08-10T16:57:04Z

2013-01-23T11:39:06Z

Module Commands

2013-01-23T11:25:13Z

Table of NIC and Modules

2013-01-23T11:23:12Z

Table of NIC and Modules

2013-01-23T11:21:10Z

ethtool

2013-01-23T11:07:38Z

network

2013-01-23T11:06:42Z

ifconfig

2013-01-23T11:06:09Z

ifconfig

2013-01-23T11:05:38Z

dmesg

2013-01-23T11:03:46Z

Module Commands

← Older revision		Revision as of 16:57, 10 August 2016
Line 262:		Line 262:
	\|-		\|-
	\|}		\|}
		+
		+	== Debugging Bonding Issue ==
		+	* With bond0
		+	<syntaxhighlight>
		+	# See what packets are going out on what interfaces
		+	cat /proc/net/dev
		+
		+	# check the bonding configuration
		+	cat /proc/net/bonding/bond0
		+
		+	# to configure LCAP (had problems balance-alb or mode=6 which supposedly doesnt need switch configuration)
		+	# in the file: /etc/modprobe.conf/bond.cong
		+	[root@lustre02-oss1 ~]# cat /etc/modprobe.d/bond.conf
		+	alias bond0 bonding
		+	options bond0 miimon=100 mode=4 lacp_rate=1
		+
		+	# reload bonding
		+	ifdown bond0
		+	rmmod bonding
		+	modprobe bonding
		+	ifup bond0
		+	</syntaxhighlight>

@@ Line 143: / Line 143: @@
 *lsmod
-Lists all of the available modules
+Lists all of the available modules, and any dependencies. In the output below mlx4_core is used by both mlx4_en and mlx4_ib. This dependency means that if you need to use both drivers they must be able to use the same version of mlx4_core.
 <syntaxhighlight>

@@ Line 255: / Line 255: @@
 ! NIC!! Module
 |-
-| i350 || igb
+| Intel i350 || igb
 |-
 | Intel 82576|| igb

@@ Line 256: / Line 256: @@
 |-
 | i350 || igb
 |-
 |}

@@ Line 209: / Line 209: @@
 ==ethtool==
-Gives full information as to the state of a network interface. Useful to check that the connection is working
+Gives full information as to the state of a network interface. Useful to check that the connection is working.
 <syntaxhighlight>
@@ Line 237: / Line 237: @@
 </syntaxhighlight>

@@ Line 75: / Line 75: @@
 ===network===
-* /etc/sysconfig/
+* /etc/sysconfig/network
 Defines the Hostname of the system, and determines if the networking is avaialable.

@@ Line 20: / Line 20: @@
 ==ifconfig==
-The next thing you need to do is check ifconfig - this will tell you if something is wrong. ifconfig shows only active connection, adding the -a flag will show all possible connections.
+The next thing you need to do is check ifconfig - this will tell you if something is wrong. ifconfig shows only active connections, adding the -a flag will show all possible connections.
-Apparent from teh obvious settings, you should check the traffic over the network. if RX and TX are zero then they are not on the network.
+Apart from theobvious settings, you should check the traffic over the network. if RX and TX are zero then they are not on the network.
 <syntaxhighlight>

@@ Line 199: / Line 199: @@
 <syntaxhighlight>
-dmesg | grep eth0
+[root@head ~]# dmesg | grep eth0
 igb 0000:01:00.0: eth0: (PCIe:2.5Gb/s:Width x4) 00:25:90:00:82:e0
 </syntaxhighlight>

@@ Line 127: / Line 127: @@
 * mlx4_ib
-==Module Commands==
+===Module Commands===
 *modprobe <module name>
@@ Line 178: / Line 178: @@
 parm:           debug_level:Enable debug tracing if > 0 (int)
 </syntaxhighlight>
 ==lspci==