Update on sock_test_client/sock_test_server: After running with LD_PRELOAD variable set, still see same issue. But the problem is on server side. Its getting SYN packet sent by client but is sending RST. Am I missing any config?
root@host2:~/vpp/build-root/build-vpp-native/vpp/bin# LD_PRELOAD=/root/vpp/build-root/build-vpp-native/vpp/lib/libvcl_ldpreload.so ./sock_test_server 1.1.0.2 10011 SERVER: Waiting for a client to connect on port 1... SERVER: epoll_wait() timeout! SERVER: epoll_wait() timeout! SERVER: epoll_wait() timeout! SERVER: epoll_wait() timeout! root@host1:~/vpp/build-root/build-vpp-native/vpp/bin# LD_PRELOAD=/root/vpp/build-root/build-vpp-native/vpp/lib/libvcl_ldpreload.so ./sock_test_client 1.1.0.2 10011 CLIENT: Connecting to server... ERROR in main(): Connection refused CLIENT: ERROR: connect failed (errno = 111)! vl_client_disconnect:331: queue drain: 585 show trace o/p on server: =================== Packet 1 03:52:39:089787: dpdk-input TenGigabitEthernet3b/0/1 rx queue 0 buffer 0x9b381: current data 0, length 74, buffer-pool 0, ref-count 1, totlen-nifb 0, trace 0x0 ext-hdr-valid l4-cksum-computed l4-cksum-correct PKT MBUF: port 0, nb_segs 1, pkt_len 74 buf_len 2176, data_len 74, ol_flags 0x180, data_off 128, phys_addr 0xab2ce0c0 packet_type 0x111 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 RTE_PTYPE_L4_TCP (0x0100) TCP packet IP4: 70:69:5a:48:08:b3 -> 00:be:75:72:3d:5f TCP: 1.1.0.1 -> 1.1.0.2 tos 0x00, ttl 255, length 60, checksum 0xfdca fragment id 0x7bec, flags DONT_FRAGMENT TCP: 44839 -> 10011 seq. 0xf06c93e7 ack 0x00000000 flags 0x02 SYN, tcp header: 40 bytes window 4096, checksum 0xa241 03:52:39:089798: ethernet-input frame: flags 0x3, hw-if-index 1, sw-if-index 1 IP4: 70:69:5a:48:08:b3 -> 00:be:75:72:3d:5f 03:52:39:089805: ip4-input-no-checksum TCP: 1.1.0.1 -> 1.1.0.2 tos 0x00, ttl 255, length 60, checksum 0xfdca fragment id 0x7bec, flags DONT_FRAGMENT TCP: 44839 -> 10011 seq. 0xf06c93e7 ack 0x00000000 flags 0x02 SYN, tcp header: 40 bytes window 4096, checksum 0xa241 03:52:39:089811: ip4-lookup fib 0 dpo-idx 5 flow hash: 0x00000000 TCP: 1.1.0.1 -> 1.1.0.2 tos 0x00, ttl 255, length 60, checksum 0xfdca fragment id 0x7bec, flags DONT_FRAGMENT TCP: 44839 -> 10011 seq. 0xf06c93e7 ack 0x00000000 flags 0x02 SYN, tcp header: 40 bytes window 4096, checksum 0xa241 03:52:39:089819: ip4-local TCP: 1.1.0.1 -> 1.1.0.2 tos 0x00, ttl 255, length 60, checksum 0xfdca fragment id 0x7bec, flags DONT_FRAGMENT TCP: 44839 -> 10011 seq. 0xf06c93e7 ack 0x00000000 flags 0x02 SYN, tcp header: 40 bytes window 4096, checksum 0xa241 03:52:39:089821: tcp4-input TCP: 44839 -> 10011 seq. 0xf06c93e7 ack 0x00000000 flags 0x02 SYN, tcp header: 40 bytes window 4096, checksum 0xa241 [0:0][T] :::0->:::0 CLOSED 03:52:39:089828: tcp4-reset TCP: 10011 -> 44839 seq. 0x00000000 ack 0xf06c93e8 flags 0x14 RST ACK, tcp header: 20 bytes window 0, checksum 0x5334 [0:0][T] :::0->:::0 CLOSED
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