Date: Thu, 23 Feb 2006 11:33:33 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-hackers@freebsd.org Cc: Eugene Grosbein <eugen@kuzbass.ru>, Nikos Vassiliadis <nvass@teledomenet.gr> Subject: Re: (feature change request) remove link-layer generated routes from netstat -r Message-ID: <200602231133.35747.jhb@freebsd.org> In-Reply-To: <200602230956.47263.nvass@teledomenet.gr> References: <200602221550.17842.nvass@teledomenet.gr> <20060223050659.GA89118@svzserv.kemerovo.su> <200602230956.47263.nvass@teledomenet.gr>
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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@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@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@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@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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