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Bug 81887 - dhcpd sends ACK to a renew request received on wrong interface
dhcpd sends ACK to a renew request received on wrong interface
Product: Red Hat Linux
Classification: Retired
Component: dhcp (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Daniel Walsh
Depends On:
  Show dependency treegraph
Reported: 2003-01-14 16:54 EST by Need Real Name
Modified: 2008-05-01 11:38 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2003-01-14 17:04:44 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Need Real Name 2003-01-14 16:54:36 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)

Description of problem:

DHCPD sends ACK on a renew request on a pool not assigned to an interface 
whereas it should send out a NAK.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
configure a dhcp server w/ multiple interfaces (in this case 5)
create pools of addresses for 4 of the 5 and no pool for the 5th.

1. acquire an address from eth0, e.g.
2. Disconnect from eth0 network
3. Connect to eth1 network.
4. Client sends a renew to dhcp on eth1


Actual Results:  5. DHCP responds with an ACK out eth1 for

Expected Results:  DHCP should have sent a NAK out eth1 to the client, then the 
client would initiate discovery.

Additional info:

Also seen the ACK and/or NAK getting sent out eth0 and eth4.  

eth1 and eth4 share an IRQ, all other adapters have their own IRQ.  Is there an 
update that takes care of this issue?
Comment 1 Need Real Name 2003-01-14 16:57:32 EST
DHCP information: 
redhat 7.1, kernel: 2.4.2-2
Comment 2 Daniel Walsh 2003-01-14 17:04:44 EST
Please check Current release of dhcp 3.0 to see if this solves the problem
Comment 3 Need Real Name 2003-01-15 14:31:49 EST
I believe adding an:

line to the beginning of dhcpd.conf causes the NAKs to be sent out if renew 
requests are receieved from clients w/ IPs from other subnets.

This functionality is present in the release mentioned, so upgrading is not 
necessary (although I did so).

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