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Date: Wed, 24 Apr 2002 22:36:21 -0400
Subject: Question about 'loop' message in dmesg.
From: Endymion Seiler <endymion@alum.dartmouth.org>
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X-Loop: FreeBSD.ORG
Hi FreeBSDers,
After much head banging (I've been spoiled by macs) I managed to
get two NE2000 cards to cooperate on my PC. I am using this PC as a
router of sorts to act as a fw between a cable modem and a home
network. My Linksys router has now been relegated to switching duties
(it has a 4 port switch builtin). After recompiling the kernel and
tweaking rc.conf according to suggestions I have my machine sucessfully
passing packets back and forth between interfaces. My question is that
I get these messages in dmesg:
-- loop (10) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
>> unmuting ed0
-- loop (0) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (1) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (2) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (3) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (4) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (5) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (6) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (7) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (8) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (9) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (10) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (11) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
>> unmuting ed0
>> unmuting ed1
-- loop (0) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
-- loop (1) 00.30.65.6d.bf.3e to ed1 from ed0 (active)
-- loop (2) 00.30.65.6d.bf.3e to ed0 from ed1 (active)
The MAC address corresponds to my router (now just a switch)
ed0 and ed1 are the two network interfaces on my PC. On the router I
have DHCP turned off and the IP address set so that it would not
conflict with anything else on the local network. Furthermore I also
get these messages.
-- loop (0) 00.04.5a.db.7a.eb to ed0 from ed1 (active)
-- loop (1) 00.04.5a.db.7a.eb to ed1 from ed0 (active)
-- loop (2) 00.04.5a.db.7a.eb to ed0 from ed1 (active)
This MAC address corresponds an ethernet card on the local network. I
do not seem to be getting this message for any other machines on the
local network. Incidentally, the machine that I DO get messages for
runs OS X (a variant of FreeBSD) and has services running.
Basically I'm wondering what this phenomenon is and if this is a bad
thing and what I should do about it. Everything seems to be working
fine otherwise.
Thanks in advance for any help,
Damien
3spam@alum.dartmouth.org
This is my rc.conf, sysctl.conf and what I added to GENERIC
net.link.ether.bridge=1
net.link.ether.bridge_ipfw=1
##
options IPFIREWALL
options IPDIVERT
options IPFIREWALL_FORWARD
options IPFIREWALL_VERBOSE
options IPFIREWALL_VERBOSE_LIMIT=100
options TCP_DROP_SYNFIN
options ICMP_BANDLIM
options DUMMYNET
options BRIDGE
##
defaultrouter="192.168.1.1"
firewall_enable="YES"
firewall_quiet="YES"
firewall_script="/etc/rc.firewall"
firewall_type="open"
font8x14="iso-8x14"
font8x16="iso-8x16"
font8x8="iso-8x8"
gateway_enable="YES"
hostname="host.domainname.com"
network_interfaces="ed0 ed1 lo0"
ifconfig_ed0="DHCP"
ifconfig_ed1="inet 192.168.1.1 netmask 255.255.0.0"
inetd_enable="YES"
kern_securelevel_enable="NO"
keyrate="fast"
linux_enable="YES"
moused_enable="YES"
natd_program="/sbin/natd"
natd_enable="YES"
natd_flags="-m -f /etc/natd.conf"
natd_interface="ed0"
nfs_client_enable="YES"
nfs_reserved_port_only="YES"
nfs_server_enable="YES"
saver="logo"
scrnmap="iso-8859-1_to_cp437"
sendmail_enable="YES"
sendmail_flags="-bd -q30m"
sshd_enable="YES"
tcp_drop_synfin="YES"
ntpdate_enable="YES"
xntpd_enable="YES"
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