[Bug 4267] New: DHCP Client: accepts ACK or NAK from other servers

bugzilla at busybox.net bugzilla at busybox.net
Thu Sep 29 05:42:29 UTC 2011


           Summary: DHCP Client: accepts ACK or NAK from other servers
           Product: Busybox
           Version: 1.15.x
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: major
          Priority: P5
         Component: Networking
        AssignedTo: unassigned at busybox.net
        ReportedBy: bspitz at yahoo.com
                CC: busybox-cvs at busybox.net
   Estimated Hours: 0.0

In networking/udhcp/dhcpc.c:
  I can see that the RX ACK and NAK processing does not qualify on the RFC
required DHCP option "server-id". When accept the offer or when renew, the
server-id has been saved from the offer we accpted, we should reject therefore
any ACK or NAK that does not have this required matching server-id.
  I can see that when i have another dhcp server on the network (how be it a
dumb server), it NAKs my T1 renew, and then i get kicked back into discovery,
and renew the lease. For a small moment, i have no IP binded, not good.

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