(feature change request) remove link-layer generated routes from netstat -r

[John Baldwin]

On Thursday 23 February 2006 02:56, Nikos Vassiliadis wrote:
> On Thursday 23 February 2006 07:06, Eugene Grosbein wrote:
> > On Wed, Feb 22, 2006 at 03:50:17PM +0200, Nikos Vassiliadis wrote:
> > > netstat -r prints link-layer generated routes and many
> > > times the output becomes somehow obscure. For
> > > example:
> > >
> > > root at brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat# netstat
> > > -ranfinet Routing tables
> > >
> > > Internet:
> > > Destination        Gateway            Flags    Refs      Use  Netif
> > > Expire default            10.1.1.244         UGS         0    31016   
> > > rl0 10.1.1/24          link#1             UC          0        0    rl0
> > > 10.1.1.181         00:0f:1f:fb:02:f5  UHLW        1        0    rl0
> > > 10.1.1.182         00:e0:fc:38:d4:40  UHLW        1        0    rl0
> > > 10.1.1.183         00:e0:fc:65:07:fd  UHLW        1        0    rl0
> > > 10.1.1.244         00:50:fc:fe:74:3b  UHLW        2        1    rl0
> > > 10.1.1.254         00:0c:cf:70:50:06  UHLW        1        0    rl0
> > > 127.0.0.1          127.0.0.1          UH          0     1117    lo0
> > > 192.168.1          link#5             UC          0        0   fxp0
> > > 192.168.1.25       00:05:5d:4d:19:58  UHLW        1        0   fxp0
> > > 192.168.1.45       00:11:43:b6:a1:55  UHLW        1        0   fxp0
> > > 192.168.1.71       00:0c:f1:b9:38:50  UHLW        1     1645   fxp0
> > > 192.168.1.84       00:04:23:af:79:66  UHLW        1        0   fxp0
> > > 192.168.1.112      00:30:4f:21:3b:8a  UHLW        1        0   fxp0
> > > 192.168.1.196      00:07:e9:40:1f:c5  UHLW        1        0   fxp0
> > > 192.168.1.199      00:e0:81:21:28:21  UHLW        1        0   fxp0
> > > 192.168.1.200      00:30:4f:03:88:03  UHLW        1        0   fxp0
> > >
> > >
> > > when the information I was actually looking for is:
> > >
> > > root at brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat# netstat -rnfinet
> > > Routing tables
> > >
> > > Internet:
> > > Destination        Gateway            Flags    Refs      Use  Netif
> > > Expire default            10.1.1.244         UGS         0    31016   
> > > rl0 10.1.1/24          link#1             UC          0        0    rl0
> > > 127.0.0.1          127.0.0.1          UH          0     1117    lo0
> > > 192.168.1          link#5             UC          0        0   fxp0
> > > root at brad:0:/usr/home/src/FreeBSD-6/src/usr.bin/netstat#
> > >
> > >
> > > The attachment patch ("cvs diff -u -rHEAD route.c" generated) prints
> > > link-layer generated routes when -a is specified and ignores them
> > > the rest of the time.
> > >
> > > Thoughts? POLA violation?
> >
> > Just use:
> >
> > netstat -rn | awk '$3 !~ /L/ { print }'
> 
> That's exactly the point Eugene, I don't want to find ways to filter it out.
> It happens frequently. I didn't say it's difficult to remove it, I just don't 
> want it there all the time. That's why you can use -a to get the old
> behavior.

Using simple pipelines with awk and sed, etc. is the UN*X way though.  Instead
of building all-singing all-dancing programs you build simpler utilities that
you "glue" together to build more complex behavior.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org