dhcpcd-discuss

Hi Alarig

On 02/12/2019 12:54, Alarig Le Lay wrote:
>  From time to time dhcpcd displays checksum failure. When it occurs I
> loose the lease and the old IPv4 address isn’t removed from the interface.
> The IPv6 lease has never expired for now.
>
> The IP 161.79.0.0 belongs to a Brazilian ISP and is well routed to it,
> so I don’t think that it’s used alongside my ISP (which is Norwegian).
> And it’s always displayed. Sometimes, I also have a checksum failure
> from 0.0.0.0
>
> core01-arendal ~ # /sbin/dhcpcd --renew enp2s0
> DUID 00:01:00:01:20:4a:2e:93:00:0d:b9:48:c1:c0
> enp2s0: IAID b9:48:c1:c1
>
> enp2s0: IA type 25 IAID e8:7b:be:be
> enp2s0: rebinding prior DHCPv6 lease
>
> enp2s0: REPLY6 received from fe80::5e5e:abff:fe43:1ece
>
> enp2s0: renew in 43200, rebind in 69120, expire in 86400 seconds
> lo: adding reject route to 2001:4640:a14f::/48
> enp2s0: delegated prefix 2001:4640:a14f::/48
> enp2s0: soliciting an IPv6 router
> enp2s0: soliciting a DHCP lease
> enp2s0: checksum failure from 161.79.0.0
> enp2s0: checksum failure from 161.79.0.0
> enp2s0: offered 88.89.68.6 from 88.91.209.1
> enp2s0: probing address 88.89.68.6/22
> enp2s0: leased 88.89.68.6 for 1200 seconds
> enp2s0: adding route to 88.89.68.0/22
> enp2s0: adding default route via 88.89.68.1
> forked to background, child pid 29103
>
> And here is my config:
> core01-arendal ~ # grep -v '^#' /etc/dhcpcd.conf
> hostname
> duid
> persistent
> option rapid_commit
> option domain_name_servers, domain_name, domain_search, host_name
> option classless_static_routes
> option interface_mtu
> require dhcp_server_identifier
> slaac private
> interface enp2s0
> metric 30
> ia_pd e8:7b:be:be
>
> I have an igb NIC:
> 02:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network
> Connection (rev 03)
>          Subsystem: Intel Corporation I211 Gigabit Network Connection
>          Kernel driver in use: igb
>          Kernel modules: igb
> core01-arendal ~ # ethtool -i enp2s0
> driver: igb
> version: 5.4.0-k
> firmware-version:  0. 6-1
> expansion-rom-version:
> bus-info: 0000:02:00.0
> supports-statistics: yes
> supports-test: yes
> supports-eeprom-access: yes
> supports-register-dump: yes
> supports-priv-flags: yes
>
> I didn’t changed the offload params:
> core01-arendal ~ # ethtool -k enp2s0 | grep offload
> tcp-segmentation-offload: on
> udp-fragmentation-offload: off
> generic-segmentation-offload: on
> generic-receive-offload: on
> large-receive-offload: off [fixed]
> rx-vlan-offload: on
> tx-vlan-offload: on
> l2-fwd-offload: off [fixed]
> hw-tc-offload: on
> esp-hw-offload: off [fixed]
> esp-tx-csum-hw-offload: off [fixed]
> rx-udp_tunnel-port-offload: off [fixed]
> tls-hw-tx-offload: off [fixed]
> tls-hw-rx-offload: off [fixed]
>
>
> Could it be a dhcpcd bug? Or perhaps something related to a hardware
> offload?

It could very well be a dhcpcd bug!
You didn't say what dhcpcd version you are using, but it was broken in 
the 8.1.0 release and then fixed in 8.1.1 (but please use 8.1.2)

Roy