DHCP client failure to obtain address

  • Greetings,

    I'm using 2.3.4 on a Netgate 5501, and recently I had an issue where the pfsense DHCP client failed to get an IP from my ISP.  A workstation connected to the router had no problem getting an IP.  Curiously, the pfsense box also exhibited a periodically high ping during the DHCP problem:

    64 bytes from icmp_seq=6 ttl=64 time=369.383 ms
    64 bytes from icmp_seq=7 ttl=64 time=3.847 ms
    64 bytes from icmp_seq=8 ttl=64 time=3.437 ms
    64 bytes from icmp_seq=9 ttl=64 time=645.179 ms
    64 bytes from icmp_seq=10 ttl=64 time=3.934 ms
    64 bytes from icmp_seq=11 ttl=64 time=130.470 ms
    64 bytes from icmp_seq=12 ttl=64 time=3.792 ms
    64 bytes from icmp_seq=13 ttl=64 time=4.073 ms

    I attempted to perform a packet capture on the WAN interface, but the capture file was empty.

    dpinger shows the following error:

    Feb 22 21:02:01 dpinger send_interval 500ms loss_interval 2000ms time_period 60000ms report_interval 0ms data_len 0 alert_interval 1000ms latency_alarm 500ms loss_alarm 20% dest_addr [WAN IP] bind_addr [another IP similar to WAN] identifier "WAN_DHCP "

    The DHCP log shows (partially):

    Feb 22 20:58:34 dhclient 77757 DHCPDISCOVER on vr1 to port 67 interval 9
    Feb 22 20:58:43 dhclient 77757 DHCPDISCOVER on vr1 to port 67 interval 13
    Feb 22 20:58:57 dhclient 77757 No DHCPOFFERS received.
    Feb 22 20:58:57 dhclient 77757 No working leases in persistent database - sleeping.
    Feb 22 20:58:57 dhclient FAIL
    Feb 22 21:01:51 dhclient PREINIT
    Feb 22 21:01:52 dhclient EXPIRE
    Feb 22 21:01:52 dhclient Deleting old routes
    Feb 22 21:01:52 dhclient PREINIT

    Then after a reboot, the DHCP problem disappeared.  Any tips for what troubleshooting steps I can take?  Thanks in advance!

  • Hi,

    Start eliminating NIC problems by, for example, switch LAN and WAN.

  • Thanks Gertjan.  The problem appears to be a software issue, since it is resolved after a reboot.  Are you aware of a software bug that would cause issues isolated to one NIC?

  • Yes, one word : realtek

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