Date: Thu, 23 Feb 2006 12:14:50 -0500 From: Gary Corcoran <gcorcoran@rcn.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org, 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: <43FDED8A.90208@rcn.com> In-Reply-To: <200602231133.35747.jhb@freebsd.org> References: <200602221550.17842.nvass@teledomenet.gr> <20060223050659.GA89118@svzserv.kemerovo.su> <200602230956.47263.nvass@teledomenet.gr> <200602231133.35747.jhb@freebsd.org>
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John Baldwin wrote:
> 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.
Yes, when you want do do something "complicated", which doesn't belong in
a single program, that's the way. But IMO that doesn't apply here. I agree
with Nikos. He just wants to limit the often-useless (to most users) output
which is *already* in the program. Just providing a simple command line option
to get back the full output, if ever needed, seems like a good, simple solution,
to make things easier for us poor humans to scan. :)
Gary
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