[Edited Message Follows] On Thu, Apr 7, 2022 at 06:44 PM, Mohsin Kazmi wrote:
> > > > Please use tcpdump to trace on Linux side to see what is happening. Please > also check for error counters on Linux side. > > > > > > Hi Mohsin, After dump, *I see that on tap interface, it can receive ping message from 192.168.56.1 so the data way 192.168.56.1 -> NIC-> virtio-> tap is OK.* *But server 192.168.56.1 can not receive any message from tap. In tcpdump at tap interface, tap ask who is 192.168.56.1 and below is vpp show trace when I ping from tap to 192.168.56.1, I see that* 0a:00:27:00:00:14 is mac address of 192.168.56.1 is in the trace but message can not go to 192.168.56.1 Packet 3 00:09:45:753528: virtio-input virtio: hw_if_index 2 next-index 4 vring 0 len 42 hdr: flags 0x00 gso_type 0x00 hdr_len 0 gso_size 0 csum_start 0 csum_offset 0 num_buffers 1 00:09:45:753533: ethernet-input ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 00:09:45:753535: l2-input l2-input: sw_if_index 2 dst 0a:00:27:00:00:14 src 02:fe:87:f0:2a:4a [l2-output ] 00:09:45:753539: l2-output l2-output: sw_if_index 1 dst 0a:00:27:00:00:14 src 02:fe:87:f0:2a:4a data 08 06 00 01 08 00 06 04 00 01 02 fe 00:09:45:753541: virtio-0/0/8/0-output virtio-0/0/8/0 ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 request, type ethernet/IP4, address size 6/4 02:fe:87:f0:2a:4a/192.168.56.101 -> 00:00:00:00:00:00/192.168.56.1 00:09:45:753543: virtio-0/0/8/0-tx buffer 0x94e56: current data 0, length 42, buffer-pool 0, ref-count 1, totlen-nifb 0, trace handle 0x2000002 l2-hdr-offset 0 l3-hdr-offset 14 hdr-sz 0 l2-hdr-offset 0 l3-hdr-offset 14 l4-hdr-offset 0 l4-hdr-sz 0 ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 request, type ethernet/IP4, address size 6/4 02:fe:87:f0:2a:4a/192.168.56.101 -> 00:00:00:00:00:00/192.168.56.1 Packet 4 00:09:46:777288: virtio-input virtio: hw_if_index 2 next-index 4 vring 0 len 42 hdr: flags 0x00 gso_type 0x00 hdr_len 0 gso_size 0 csum_start 0 csum_offset 0 num_buffers 1 00:09:46:777293: ethernet-input ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 00:09:46:777296: l2-input l2-input: sw_if_index 2 dst 0a:00:27:00:00:14 src 02:fe:87:f0:2a:4a [l2-output ] 00:09:46:777299: l2-output l2-output: sw_if_index 1 dst 0a:00:27:00:00:14 src 02:fe:87:f0:2a:4a data 08 06 00 01 08 00 06 04 00 01 02 fe 00:09:46:777301: virtio-0/0/8/0-output virtio-0/0/8/0 ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 request, type ethernet/IP4, address size 6/4 02:fe:87:f0:2a:4a/192.168.56.101 -> 00:00:00:00:00:00/192.168.56.1 00:09:46:777303: virtio-0/0/8/0-tx buffer 0x94e7b: current data 0, length 42, buffer-pool 0, ref-count 1, totlen-nifb 0, trace handle 0x2000003 l2-hdr-offset 0 l3-hdr-offset 14 hdr-sz 0 l2-hdr-offset 0 l3-hdr-offset 14 l4-hdr-offset 0 l4-hdr-sz 0 ARP: 02:fe:87:f0:2a:4a -> 0a:00:27:00:00:14 request, type ethernet/IP4, address size 6/4 02:fe:87:f0:2a:4a/192.168.56.101 -> 00:00:00:00:00:00/192.168.56.1
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