[Bug 3019] New: udhcpc fails to renew lease on SIGUSR1

bugzilla at busybox.net bugzilla at busybox.net
Tue Dec 28 10:16:50 UTC 2010


https://bugs.busybox.net/show_bug.cgi?id=3019

           Summary: udhcpc fails to renew lease on SIGUSR1
           Product: Busybox
           Version: 1.17.x
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: nitr0 at seti.kr.ua
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0


I use udhcpc on embedded platform. When I tried to renew lease via sending
SIGUSR1 (or release lease via sending SIGUSR2 and renew lease via sending
SIGUSR1) - as result udhcpc can't obtain lease. tcpdump shows that dhcp server
answers are present:

00:35:57.763252 1c:af:f7:41:9b:4f > ff:ff:ff:ff:ff:ff, ethertype IPv4 (0x0800),
length 333: (tos 0x0, ttl 64, id 0, offset 0, flags [none], proto UDP (17),
length 319)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request [|bootp]
00:35:57.763527 00:18:f3:fd:22:fe > 1c:af:f7:41:9b:4f, ethertype IPv4 (0x0800),
length 342: (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17),
length 328)
    172.19.32.254.67 > 172.19.32.220.68: BOOTP/DHCP, Reply, length 300, xid
0xbc341d43, secs 3, Flags [none] (0x0000)
          Your-IP 172.19.32.220
          Server-IP 172.19.32.254 [|bootp]


In log - only retries of renew:
Dec 28 01:25:17 udhcpc[786]: Performing a DHCP renew
Dec 28 01:25:17 udhcpc[786]: Sending discover...
Dec 28 01:25:22 udhcpc[786]: Sending discover...
Dec 28 01:25:27 udhcpc[786]: Sending discover...
Dec 28 01:25:32 udhcpc[786]: Sending discover...

In usual mode udhcpc renews lease successful on lease timeout.

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