Ok, from what I understand, what you see in the trace is when the packet is entering VPP through DPDK, it matches the route 'vppctl ip route add 172.16.82.4/32 via 192.168.1.1 memif0/0' you configured in table 0 (default VRF), so VPP tries to forward it through 192.168.1.1, but this address is programmed only in VRF 1, so VRF 0 does not know it and ARP. Then ARP reply comes back from memif0, but is is looked up in VRF 1 and is dropped (it is waited for in VRF 0). I think you should change your route like this: vppctl ip route add 172.16.82.4/32 via 192.168.1.1 memif0/0 next-hop-table 1 vppctl ip route add 172.16.82.4/32 table 1 via GigabitEthernet3/0/0 next-hop-table 0
Best ben > -----Original Message----- > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of > techi...@gmail.com > Sent: jeudi 13 août 2020 10:09 > To: vpp-dev@lists.fd.io > Subject: Re: [vpp-dev] #vpp-memif Send packets out on physical interface > controlled by vpp(DPDK) once they are received through memif > > Hi ben, > > Please find below trace (dpdk-input and memif-input).... in application I > am just writing back buffers I received on memif.. > > 00:02:56:971957: dpdk-input > GigabitEthernet4/0/0 rx queue 0 > buffer 0x98114: current data 0, length 74, buffer-pool 0, ref-count 1, > totlen-nifb 0, trace handle 0x0 > ext-hdr-valid > l4-cksum-computed l4-cksum-correct > PKT MBUF: port 1, nb_segs 1, pkt_len 74 > buf_len 2176, data_len 74, ol_flags 0x180, data_off 128, phys_addr > 0x56604580 > packet_type 0x11 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_L2_ETHER (0x0001) Ethernet packet > RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers > IP4: a4:bb:6d:0f:bf:56 -> 00:0d:48:49:12:a2 > ICMP: 172.16.16.17 -> 172.16.82.4 > tos 0x00, ttl 128, length 60, checksum 0x0423 dscp CS0 ecn NON_ECN > fragment id 0x7c68 > ICMP echo_request checksum 0x4baf > 00:02:56:971980: ethernet-input > frame: flags 0x3, hw-if-index 2, sw-if-index 2 > IP4: a4:bb:6d:0f:bf:56 -> 00:0d:48:49:12:a2 > 00:02:56:971994: ip4-input-no-checksum > ICMP: 172.16.16.17 -> 172.16.82.4 > tos 0x00, ttl 128, length 60, checksum 0x0423 dscp CS0 ecn NON_ECN > fragment id 0x7c68 > ICMP echo_request checksum 0x4baf > 00:02:56:972001: ip4-lookup > fib 0 dpo-idx 3 flow hash: 0x00000000 > ICMP: 172.16.16.17 -> 172.16.82.4 > tos 0x00, ttl 128, length 60, checksum 0x0423 dscp CS0 ecn NON_ECN > fragment id 0x7c68 > ICMP echo_request checksum 0x4baf > 00:02:56:972007: ip4-arp > ICMP: 172.16.16.17 -> 172.16.82.4 > tos 0x00, ttl 128, length 60, checksum 0x0423 dscp CS0 ecn NON_ECN > fragment id 0x7c68 > ICMP echo_request checksum 0x4baf > 00:02:56:972019: ip4-drop > ICMP: 172.16.16.17 -> 172.16.82.4 > tos 0x00, ttl 128, length 60, checksum 0x0423 dscp CS0 ecn NON_ECN > fragment id 0x7c68 > ICMP echo_request checksum 0x4baf > 00:02:56:972083: error-drop > rx:GigabitEthernet4/0/0 > 00:02:56:972088: drop > ip4-arp: ARP requests sent > > Packet 2 > > 00:02:56:972299: memif-input > memif: hw_if_index 3 next-index 4 > slot: ring 0 > 00:02:56:972327: ethernet-input > frame: flags 0x1, hw-if-index 3, sw-if-index 3 > ARP: 02:fe:87:ff:c6:2a -> ff:ff:ff:ff:ff:ff > 00:02:56:972335: arp-input > request, type ethernet/IP4, address size 6/4 > 02:fe:87:ff:c6:2a/192.168.1.1 -> 00:00:00:00:00:00/192.168.1.1 > 00:02:56:972339: arp-reply > request, type ethernet/IP4, address size 6/4 > 02:fe:87:ff:c6:2a/192.168.1.1 -> 00:00:00:00:00:00/192.168.1.1 > 00:02:56:972350: error-drop > rx:memif0/0 > 00:02:56:972351: drop > null-node: blackholed packets
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