Re: [UPDATED:] Re: confusion on /sbin/ifconfig on F16

On 05/23/2012 11:22 AM, Paul Allen Newell wrote: > [updated, keeping original post and adding new info at bottom] > > On 5/22/2012 8:12 PM, Paul Allen Newell wrote: >> Hello: >> >> As I continue dealing with iptables, another issue has come up that I can't tell >> is a mis-understanding on my part or a potential problem >> >> I have three F16 machines, one x86_64 and two i383/686. If I run /sbin/ifconfig on >> them, I get (short summary of): >> >> x86_64: eth0 >> i686: em1 >> >> Looking in /etc/sysconfig/network-scripts, I can see only ifcfg-em1 and no >> ifcfg-eth0 on all the machines (x86_64 and i686). >> >> The closest bugzilla I can see if 784314 but it looks like it hints that ifconfig >> is old-school and the right way to do things (and its F17 not F16). >> >> Does anyone know what I am either doing wrong or if this looks like a problem/bug. >> Plus, if there is a better way, I'd love to know. >> >> What I want to do is have is a bash way to get the static ip address of the >> machine which I can see in eth0/em1. I've been using something I found online >> which assumes everything is eth0 (as in I think it was for older Fedora): >> +++ >> /sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}' >> +++ >> >> Its too clever for me to have come up with on my own (smile). >> >> I tried expanding the grep to be 'inet addr:192.168.2' but that failed on the >> laptop which has an entry for wireless which is dhcp (I cannot assume wireless >> will be 192.168.2.*). >> >> Any suggestions appreciated, >> Thanks, >> Paul > > Okay, so I managed to figure out that 'ip' is the new command. I'd looked at it > earlier to try to find a way around this, but couldn't figure it out. Just spotted > the 'obsolete, use ip' in man page of ifconfig. As usual, there is always something > discovered right after I make the post. > > Should I assume that even if ifconfig is giving a problem, its academic and I > should just focus on ip. And, if so, how the heck does one get the ip addr. If I > use "ip addr show", I still get eth0 on the x86_64 and em1 on the i686? > I guess I really don't know what precisely is the problem you're having. Interface naming convention has been undergoing changes since, maybe, F14. Interfaces that were once called eth0 became em1 and other niceties. I don't recall if the names changed on upgrades or only new installs. Anyway, the changes didn't make my life miserable, so I've kind of ignored the changes.

So, what is it that you are really after? Do you just want a script, or series of commands, to return the IP address of a single, known interface?