Weblog entry #32 for simonw
See all weblog entries made by simonw.
#32
Bitten by ifconfig
Posted by simonw on Fri 3 Feb 2006 at 14:20
ifconfig is obselete, we know it, but we still use it and teach it.
"ip addr list" is my friend.
Wanted to alias an address to my ethernet card.
ifconfig eth0:1 a.b.c.d netmask x.y.w.z
Came back later and a.b.c.d is still working.
ping a.b.c.d # worked.
arp -a # doesn't show anything as it is local.
/sbin/ifconfig # doesn't show anything!
ping a.b.c.d # from another box on the network worked.
arp -a # Shows I have the right PC
A quick glance at command history shows that I aliased "eth0:1" instead of "eth1:1", and since eth0 isn't configured, ifconfig doesn't show it.
ip addr list # Shows everything I need to understand what is happening.
Moral, avoid obselete commands. Another 5 minutes of my life wasted.
"ip addr list" is my friend.
Wanted to alias an address to my ethernet card.
ifconfig eth0:1 a.b.c.d netmask x.y.w.z
Came back later and a.b.c.d is still working.
ping a.b.c.d # worked.
arp -a # doesn't show anything as it is local.
/sbin/ifconfig # doesn't show anything!
ping a.b.c.d # from another box on the network worked.
arp -a # Shows I have the right PC
A quick glance at command history shows that I aliased "eth0:1" instead of "eth1:1", and since eth0 isn't configured, ifconfig doesn't show it.
ip addr list # Shows everything I need to understand what is happening.
Moral, avoid obselete commands. Another 5 minutes of my life wasted.
Comments on this Entry
# ip addr list ip: command not found apt-file search bin/ip iproute: bin/ip iproute: sbin/ip apt-cache show iproute ... Description: Professional tools to control the networking in Linux kernels This is `iproute', the professional set of tools to control the networking behavior in kernels 2.2.x and later. . At least, the options CONFIG_NETLINK and CONFIG_NETLINK_DEV (or CONFIG_RTNETLINK) must be compiled into the running kernel. . This package is also known as iproute2 upstream and in some documentation.
What tools are the experts using ? and how are they using them.
I sometimes have problems with ifconfig when configuring things temporarilly. (no sys-op just for the home network)
Moral, use debian tools to find out what the heck people are talking about. Another 5 minutes of my life wasted. (or maybe not if this tool is useful :) )
[ Parent | Reply to this comment ]