change the MAC on an vlan interface

From: Schlothauer, Martin (Martin.Schlothauer_at_LVERMAFF.brandenburg.de)
Date: 12/17/03

  • Next message: Charles Swiger: "Re: suffering from poor network performance..." 
    Date: Wed, 17 Dec 2003 19:06:49 +0100
To: <freebsd-net@freebsd.org>

    Hello,

    I tried to use freevrrpd on an vlan interface and had trouble.
    When i change the MAC on the vlan interface i lost packets.
    After restoring the MAC it works again.
    A simple test whith ifconfig and 3 ping-packets shows the problem.
    After the first packet i have done

    # ifconfig vlan0 ether 0:0:5e:0:1:b0

    and after the second back with

    # ifconfig vlan0 ether 00:01:02:69:91:7c

    The tcpdump on the parent interface is what i expect, but on the
    vlan0 i missing one echo reply.
    Whats wrong ?

    # tcpdump -eni xl0
    tcpdump: WARNING: xl0: no IPv4 address assigned
    tcpdump: listening on xl0
    16:42:24.907298 0:1:2:69:91:7c 8:0:2b:e7:51:62 8100 102: 802.1Q vlan#306 P0 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:24.907777 8:0:2b:e7:51:62 0:1:2:69:91:7c 8100 102: 802.1Q vlan#306 P0 10.133.2.28 > 10.133.2.22: icmp: echo reply
    16:42:29.340845 0:0:5e:0:1:b0 ff:ff:ff:ff:ff:ff 8100 46: 802.1Q vlan#306 P0 arp who-has 10.133.2.22 tell 10.133.2.22
    16:42:34.917443 0:0:5e:0:1:b0 8:0:2b:e7:51:62 8100 102: 802.1Q vlan#306 P0 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:34.917908 8:0:2b:e7:51:62 0:0:5e:0:1:b0 8100 102: 802.1Q vlan#306 P0 10.133.2.28 > 10.133.2.22: icmp: echo reply
    16:42:38.122184 0:1:2:69:91:7c ff:ff:ff:ff:ff:ff 8100 46: 802.1Q vlan#306 P0 arp who-has 10.133.2.22 tell 10.133.2.22
    16:42:44.927599 0:1:2:69:91:7c 8:0:2b:e7:51:62 8100 102: 802.1Q vlan#306 P0 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:44.928132 8:0:2b:e7:51:62 0:1:2:69:91:7c 8100 102: 802.1Q vlan#306 P0 10.133.2.28 > 10.133.2.22: icmp: echo reply
    ^C
    8 packets received by filter
    0 packets dropped by kernel
    #

    # tcpdump -eni vlan0
    tcpdump: listening on vlan0
    16:42:24.907289 0:1:2:69:91:7c 8:0:2b:e7:51:62 0800 98: 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:24.907780 8:0:2b:e7:51:62 0:1:2:69:91:7c 0800 98: 10.133.2.28 > 10.133.2.22: icmp: echo reply
    16:42:29.340838 0:0:5e:0:1:b0 ff:ff:ff:ff:ff:ff 0806 42: arp who-has 10.133.2.22 tell 10.133.2.22
    16:42:34.917435 0:0:5e:0:1:b0 8:0:2b:e7:51:62 0800 98: 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:38.122176 0:1:2:69:91:7c ff:ff:ff:ff:ff:ff 0806 42: arp who-has 10.133.2.22 tell 10.133.2.22
    16:42:44.927591 0:1:2:69:91:7c 8:0:2b:e7:51:62 0800 98: 10.133.2.22 > 10.133.2.28: icmp: echo request
    16:42:44.928135 8:0:2b:e7:51:62 0:1:2:69:91:7c 0800 98: 10.133.2.28 > 10.133.2.22: icmp: echo reply
    ^C
    7 packets received by filter
    0 packets dropped by kernel
    #

    Best regards,
    Martin Schlothauer

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