Page MenuHomeVyOS Platform
Create Task
Maniphest T2163

Disabled vif interface with "address dhcp" requests DHCP address
Open, Requires assessmentPublicBUG
Actions

Description

If an interface is disabled and configured to request its address from a DHCP-server, the interface will still get an IP-address (at least during boot)
I would expect that the "disabled"-statement would override/disable the dhcp process.

For recreation:

 ethernet eth0 {
     .....
     vif 2 {
          address dhcp
          disable
     }
}

save the configuration and reboot

I am trying have a DHCP-interface as a backup interface only to be enabled in failure-scenarios. As of now this is not working, and the interface grabs a DHCP-address during boot.

Details

Difficulty level
Unknown (require assessment)
Version
1.3-rolling-202003260634
Why the issue appeared?
Will be filled on close
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

Related Objects

Event Timeline

janegil created this task.Mar 26 2020, 5:04 PM
Viacheslav mentioned this in T2644: Bonding interfaces cannot be disabled.Jul 21 2020, 1:17 PM
Viacheslav added a subscriber: Viacheslav.Aug 19 2020, 9:33 AM

dhclient script up this interface after hooks

/usr/sbin/dhclient-script

run_hook /etc/dhcp/dhclient-enter-hooks
run_hookdir /etc/dhcp/dhclient-enter-hooks.d

# Execute the operation
case "$reason" in

    ### DHCPv4 Handlers

    MEDIUM|ARPCHECK|ARPSEND)
        # Do nothing
        ;;
    PREINIT)
        # The DHCP client is requesting that an interface be
        # configured as required in order to send packets prior to
        # receiving an actual address. - dhclient-script(8)

        # ensure interface is up
        ip link set dev ${interface} up
pasik added a subscriber: pasik.Aug 19 2020, 7:17 PM
erkin renamed this task from Disabled vif interface with "address dhcp" requests DHCP address. to Disabled vif interface with "address dhcp" requests DHCP address.Aug 30 2021, 8:02 AM
erkin set Issue type to Bug (incorrect behavior).
syncer edited projects, added VyOS 1.3 Equuleus (1.3.0); removed VyOS 1.3 Equuleus.Nov 6 2021, 11:25 AM
syncer edited projects, added VyOS 1.3 Equuleus (1.3.3); removed VyOS 1.3 Equuleus (1.3.0).Aug 29 2022, 7:05 AM