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VPP DHCP address cannot be assigned on some clouds
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Description

VPP DHCP address cannot be assigned on some clouds
For example, on AWS:

Config:

vyos@VyOS-for-Smoke-Tests:~$ show conf com | match "eth1|vpp"
set interfaces ethernet eth1 address 'dhcp'
set interfaces ethernet eth1 description 'LAN'
set interfaces ethernet eth1 dhcp-options no-default-route
set interfaces ethernet eth1 mtu '1500'
set vpp settings interface eth1 dpdk-options promisc
set vpp settings interface eth1 driver 'dpdk'
set vpp settings unix poll-sleep-usec '222'
vyos@VyOS-for-Smoke-Tests:~$

Trace

vpp# show trace           
------------------- Start of thread 0 vpp_main -------------------
Packet 1

00:07:00:472210: dpdk-input
  eth1 rx queue 0
  buffer 0x7b3e6: current data 0, length 590, buffer-pool 0, ref-count 1, trace handle 0x0
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 590
    buf_len 2176, data_len 590, ol_flags 0x180, data_off 128, phys_addr 0x4b91d380
    packet_type 0x210 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
    Packet Offload Flags
      PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
      PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
    Packet Types
      RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
      RTE_PTYPE_L4_UDP (0x0200) UDP packet
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:00:472510: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
00:07:00:472514: ip4-input
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:00:472517: ip4-not-enabled
    fib:0 adj:0 flow:0x00000000
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:00:472520: error-drop
  rx:eth1
00:07:00:472521: drop
  dpdk-input: no error

Packet 2

00:07:14:612322: dpdk-input
  eth1 rx queue 0
  buffer 0x7b425: current data 0, length 590, buffer-pool 0, ref-count 1, trace handle 0x1
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 590
    buf_len 2176, data_len 590, ol_flags 0x180, data_off 128, phys_addr 0x4b91f300
    packet_type 0x210 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
    Packet Offload Flags
      PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
      PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
    Packet Types
      RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
      RTE_PTYPE_L4_UDP (0x0200) UDP packet
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:14:612625: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
00:07:14:612628: ip4-input
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:14:612629: ip4-not-enabled
    fib:0 adj:0 flow:0x00000000
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:14:612631: error-drop
  rx:eth1
00:07:14:612632: drop
  dpdk-input: no error

Packet 3

00:07:28:954854: dpdk-input
  eth1 rx queue 0
  buffer 0x7b464: current data 0, length 590, buffer-pool 0, ref-count 1, trace handle 0x2
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 590
    buf_len 2176, data_len 590, ol_flags 0x180, data_off 128, phys_addr 0x4c921280
    packet_type 0x210 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
    Packet Offload Flags
      PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
      PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
    Packet Types
      RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
      RTE_PTYPE_L4_UDP (0x0200) UDP packet
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:28:955151: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
00:07:28:955154: ip4-input
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:28:955155: ip4-not-enabled
    fib:0 adj:0 flow:0x00000000
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:07:28:955156: error-drop
  rx:eth1
00:07:28:955157: drop
  dpdk-input: no error

Packet 4

00:07:50:799285: dpdk-input
  eth1 rx queue 0
  buffer 0x7b4a3: current data 0, length 42, buffer-pool 0, ref-count 1, trace handle 0x3
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 42
    buf_len 2176, data_len 42, ol_flags 0x0, data_off 128, phys_addr 0x4c923200
    packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
  ARP: 06:88:62:0d:39:6d -> ff:ff:ff:ff:ff:ff
  request, type ethernet/IP4, address size 6/4
  06:88:62:0d:39:6d/172.16.21.1 -> 00:00:00:00:00:00/172.16.21.25
00:07:50:799586: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  ARP: 06:88:62:0d:39:6d -> ff:ff:ff:ff:ff:ff
00:07:50:799592: arp-input
  request, type ethernet/IP4, address size 6/4
  06:88:62:0d:39:6d/172.16.21.1 -> 00:00:00:00:00:00/172.16.21.25
00:07:50:799594: linux-cp-arp-phy
  rx-sw-if-index: 1 opcode: 1
00:07:50:799601: error-drop
  rx:eth1
00:07:50:799602: drop
  dpdk-input: no error

Packet 5

00:08:40:990442: dpdk-input
  eth1 rx queue 0
  buffer 0x7b4e2: current data 0, length 590, buffer-pool 0, ref-count 1, trace handle 0x4
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 590
    buf_len 2176, data_len 590, ol_flags 0x180, data_off 128, phys_addr 0x4c925180
    packet_type 0x210 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
    Packet Offload Flags
      PKT_RX_IP_CKSUM_GOOD (0x0080) IP cksum of RX pkt. is valid
      PKT_RX_L4_CKSUM_GOOD (0x0100) L4 cksum of RX pkt. is valid
    Packet Types
      RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers
      RTE_PTYPE_L4_UDP (0x0200) UDP packet
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:08:40:990732: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  IP4: 06:88:62:0d:39:6d -> 06:22:c0:87:dc:d5
00:08:40:990735: ip4-input
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:08:40:990736: ip4-not-enabled
    fib:0 adj:0 flow:0x00000000
  UDP: 172.16.21.1 -> 172.16.21.25
    tos 0x00, ttl 255, length 576, checksum 0xf771 dscp CS0 ecn NON_ECN
    fragment id 0x0000, flags DONT_FRAGMENT
  UDP: 67 -> 68
    length 556, checksum 0x0000
00:08:40:990738: error-drop
  rx:eth1
00:08:40:990739: drop
  dpdk-input: no error

Details

Version
VyOS 2025.09.14-0044-rolling
Is it a breaking change?
Unspecified (possibly destroys the router)
Issue type
Bug (incorrect behavior)

Related Objects
Search...

StatusSubtypeAssignedTask
 OpenBUGNoneT7070 VPP related bugs the root task
 OpenBUGNoneT7860 VPP DHCP address cannot be assigned on some clouds

Event Timeline

Viacheslav created this task.Sep 24 2025, 11:39 AM
Viacheslav added a parent task: T7070: VPP related bugs the root task.Sep 24 2025, 11:44 AM
pasik subscribed.Sep 24 2025, 4:49 PM
Viacheslav triaged this task as Normal priority.Sep 27 2025, 2:09 PM
Aljutor subscribed.Mon, Nov 10, 10:06 PM

Not sure Is this related or not, but on i40e dhcp also fails to assign address

Viacheslav added a comment.Tue, Nov 18, 5:20 AM

One solution that I found, edit the template to allow dhcp_plugin

sudo nano -c +93  /usr/share/vyos/templates/vpp/startup.conf.j2

Add plugin:

plugin dhcp_plugin.so { enable }

Call this command:

sudo vppctl set dhcp client intfc eth1 hostname r14

eth1

vyos@r14# sudo vppctl show int addr
eth0 (up):
  L3 192.168.122.14/24
eth1 (up):
  L3 192.168.100.201/24
local0 (dn):
tap4096 (up):
tap4097 (up):
[edit]
vyos@r14# 

---
vyos@r14# run show interfaces 
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface    IP Address          MAC                VRF        MTU  S/L    Description
-----------  ------------------  -----------------  -------  -----  -----  -------------
eth0         192.168.122.14/24   52:54:00:8d:67:6e  default   1500  u/u
eth1         192.168.100.201/24  52:54:00:f4:d5:cd  default   1500  u/u
Viacheslav added a comment.Tue, Nov 18, 11:39 AM

With this option, set interface feature eth1 ip4-not-enabled arc ip4-unicast disable

Packet 22

00:09:06:251579: dpdk-input
  eth1 rx queue 0
  buffer 0x9c935: current data 0, length 344, buffer-pool 0, ref-count 1, trace handle 0x15
                  ext-hdr-valid 
  PKT MBUF: port 0, nb_segs 1, pkt_len 344
    buf_len 2176, data_len 344, ol_flags 0x0, data_off 128, phys_addr 0x36524dc0
    packet_type 0x0 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 
    rss 0x0 fdir.hi 0x0 fdir.lo 0x0
  IP4: 52:54:00:18:68:5b -> 52:54:00:f4:d5:cd
  UDP: 192.168.100.1 -> 192.168.100.200
    tos 0xc0, ttl 64, length 330, checksum 0xf2f2 dscp CS6 ecn NON_ECN
    fragment id 0x3bd6
  UDP: 67 -> 68
    length 310, checksum 0x4189
00:09:06:251872: ethernet-input
  frame: flags 0x1, hw-if-index 1, sw-if-index 1
  IP4: 52:54:00:18:68:5b -> 52:54:00:f4:d5:cd
00:09:06:251874: ip4-input
  UDP: 192.168.100.1 -> 192.168.100.200
    tos 0xc0, ttl 64, length 330, checksum 0xf2f2 dscp CS6 ecn NON_ECN
    fragment id 0x3bd6
  UDP: 67 -> 68
    length 310, checksum 0x4189
00:09:06:251875: ip4-lookup
  fib 0 dpo-idx 11 flow hash: 0x00000000
  UDP: 192.168.100.1 -> 192.168.100.200
    tos 0xc0, ttl 64, length 330, checksum 0xf2f2 dscp CS6 ecn NON_ECN
    fragment id 0x3bd6
  UDP: 67 -> 68
    length 310, checksum 0x4189
00:09:06:251877: ip4-receive
    fib:0 adj:11 flow:0x00000000
  UDP: 192.168.100.1 -> 192.168.100.200
    tos 0xc0, ttl 64, length 330, checksum 0xf2f2 dscp CS6 ecn NON_ECN
    fragment id 0x3bd6
  UDP: 67 -> 68
    length 310, checksum 0x4189
00:09:06:251880: ip4-drop
    fib:0 adj:1 flow:0x00000000
  UDP: 192.168.100.1 -> 192.168.100.200
    tos 0xc0, ttl 64, length 330, checksum 0xf2f2 dscp CS6 ecn NON_ECN
    fragment id 0x3bd6
  UDP: 67 -> 68
    length 310, checksum 0x4189
00:09:06:251881: error-drop
  rx:eth1
00:09:06:251881: drop
  ip4-local: ip4 spoofed local-address packet drops