Date: Tue, 26 Jan 2010 15:41:54 +0300 From: Ruslan Ermilov <ru@FreeBSD.org> To: Nick Rogers <ncrogers@gmail.com> Cc: stable@freebsd.org Subject: Re: netstat output changes in 8.0? Message-ID: <20100126124154.GA72180@edoofus.dev.vega.ru> In-Reply-To: <147432021001251901u7d56f014n83e834061fd09fec@mail.gmail.com> References: <147432021001251901u7d56f014n83e834061fd09fec@mail.gmail.com>
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On Mon, Jan 25, 2010 at 07:01:46PM -0800, Nick Rogers wrote:
> Before 8.0-RELEASE, if I ran netstat -rn, it listed a separate route for
> each host on the network, along with its MAC address. For example ...
>
> 172.20.172.17 00:02:b3:2f:64:6a UHLW 1 105712 1500
> vlan172 595
> 172.20.172.20 00:1e:c9:bb:7c:a9 UHLW 1 1002 1500
> vlan172 598
> 172.20.172.22 00:14:5e:16:bb:b6 UHLW 1 107 1500
> vlan172 491
>
> This behavior seems to have changed in 8.0, where now only the
> locally-assigned IP addresses and related CIDRs are displayed.
>From src/UPDATING:
: 20081214:
: __FreeBSD_version 800059 incorporates the new arp-v2 rewrite.
: RTF_CLONING, RTF_LLINFO and RTF_WASCLONED flags are eliminated.
: The new code reduced struct rtentry{} by 16 bytes on 32-bit
: architecture and 40 bytes on 64-bit architecture. The userland
: applications "arp" and "ndp" have been updated accordingly.
: The output from "netstat -r" shows only routing entries and
: none of the L2 information.
> Is there any way to get this behavior back, perhaps with a new flag that I
> am not able to find? Or some sysctl? I have a script that was relying on
> each host's "expire" flag in the routing table to determine when the MAC
> address first appeared on the network according to ARP.
If you need to know when a particular ARP entry expires, a variation
of the following patch can be used, perhaps hiding this output by the
-v (verbose) option.
%%%
Index: arp.c
===================================================================
--- arp.c (revision 203016)
+++ arp.c (working copy)
@@ -101,7 +101,8 @@
static int nflag; /* no reverse dns lookups */
static char *rifname;
-static int expire_time, flags, doing_proxy, proxy_only;
+static time_t expire_time;
+static int flags, doing_proxy, proxy_only;
/* which function we're supposed to do */
#define F_GET 1
@@ -594,6 +595,15 @@
printf(" on %s", ifname);
if (rtm->rtm_rmx.rmx_expire == 0)
printf(" permanent");
+ else {
+ static struct timeval tv;
+ if (tv.tv_sec == 0)
+ gettimeofday(&tv, 0);
+ if ((expire_time = rtm->rtm_rmx.rmx_expire - tv.tv_sec) > 0)
+ printf(" expires %d", (int)expire_time);
+ else
+ printf(" expired");
+ }
if (addr->sin_other & SIN_PROXY)
printf(" published (proxy only)");
if (rtm->rtm_flags & RTF_ANNOUNCE)
%%%
Cheers,
--
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer
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