BIND 10 #3233: Kea4: We send back ICMP Port Unreachable for each incoming packet

[BIND 10 Development]

#3233: Kea4: We send back ICMP Port Unreachable for each incoming packet
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                   Reporter:  tomek  |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:  DHCP
                   Priority:         |  Outstanding Tasks
  medium                             |              Keywords:
                  Component:  dhcp4  |             Sensitive:  0
               CVSS Scoring:         |           Sub-Project:  DHCP
            Defect Severity:  N/A    |  Estimated Difficulty:  0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 For each incoming DHCPv4 packet, we send back ICMP Port Unreachable.

 There are at least two ways to fix that. One is to open a UDP socket and
 ignore whatever comes through it. Another is to add a rule to iptables.
 Yet another is to use LPF to essentially add a rule.

 Keep in mind that it is the OS that sends this back, not Kea.

 I think it makes sense to open normal socket, because admins then may use
 standard commands to look at open sockets.

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Ticket URL: <http://bind10.isc.org/ticket/3233>
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