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The current op-mode script simply calls sudo systemctl restart "dhclient@$4.service"
with no additional information about a client interface at all.
This results in useless dhclient processes
root 47812 4.7 0.0 5848 3584 ? Ss 00:30 0:00 /sbin/dhclient -4 -d
root 48121 0.0 0.0 4188 3072 ? S 00:30 0:00 \_ /bin/sh /sbin/dhclient-script
root 48148 50.0 0.2 18776 11264 ? R 00:30 0:00 \_ python3 -
Which also assign client leases to all local interfaces, if we receive one
valid DHCPOFFER
vyos@vyos:~$ show interfaces
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address MAC VRF MTU S/L Description
----------- ----------------- ----------------- ------- ----- ----- -------------
eth0 - 00:50:56:bf:c5:6d default 1500 u/u
eth0.10 172.16.33.102/24 00:50:56:bf:c5:6d default 1500 u/u
eth1 172.16.33.131/24 00:50:56:b3:38:c5 default 1500 u/u
172.16.33.102/24 and 172.16.33.131/24 are stray DHCP addresses.
This commit moved the renew command to the DHCP op-mode script to properly
validate if the interface we request a renew for, has actually a dhcp address
configured. In additional this exposes the renew feature to the API.
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This reverts commit 9afcea251bdc895ffd49cb11f455fd636fdf817b
A DHCP relese must also be originated from the VRF where the dhclient program is
running, else the RELEASE message can not be send through the interface towards
the DHCP server.
The reason it did not work in the past was because of https://vyos.dev/T5476
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Otherwise packet can be received in a VRF that was already deleted.
Image of the following CLI commands:
del interface ethernet eth0 address dhcp
del interface ethernet eth0 vrf red
del vrf name red
VRF could be deleted even if dhclient release was not yet completely
processed.
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vyos@vyos# run show vrf MGMT processes
2282 sshd
There is no dhclient process running in given VRF. dhclient complains it can
not send out packets via the given interface (as it's not bound to that VRF)
Aug 02 20:29:54 dhclient[1686]: send_packet: Network is unreachable
Aug 02 20:29:54 dhclient[1686]: send_packet: please consult README file regarding broadcast address.
Aug 02 20:29:54 dhclient[1686]: dhclient.c:3001: Failed to send 300 byte long packet over fallback interface.
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