Hi, I am having a problem when LDP attempts to setup a session. According to Wikipedia's LDP page <https://en.wikipedia.org/wiki/Label_Distribution_Protocol>, LDP first exchanges packets on UDP and then start a session by setting up TCP connection.
UDP packets from control plane to data plane are sent, but the TCP connection is not set up. Here is what show trace shows: ================== UDP ================== Packet 8 00:10:18:346891: dpdk-input GigabitEthernet13/0/0 rx queue 0 buffer 0x6468: current data 14, length 70, free-list 0, clone-count 0, totlen-nifb 0, trace 0x7 ext-hdr-valid l4-cksum-computed l4-cksum-correct l2-hdr-offset 0 l3-hdr-offset 14 PKT MBUF: port 0, nb_segs 1, pkt_len 84 buf_len 2176, data_len 84, ol_flags 0x0, data_off 128, phys_addr 0x3fd91a80 packet_type 0x10 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 Packet Types RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers IP4: 00:0c:29:3a:39:d7 -> 01:00:5e:00:00:02 UDP: 192.168.1.1 -> 224.0.0.2 tos 0xc0, ttl 1, length 70, checksum 0xc20e fragment id 0x152d, flags DONT_FRAGMENT UDP: 646 -> 646 length 50, checksum 0x245a 00:10:18:346913: ip4-input UDP: 192.168.1.1 -> 224.0.0.2 tos 0xc0, ttl 1, length 70, checksum 0xc20e fragment id 0x152d, flags DONT_FRAGMENT UDP: 646 -> 646 length 50, checksum 0x245a 00:10:18:346925: ip4-mfib-forward-lookup fib 0 entry 6 00:10:18:346931: ip4-mfib-forward-rpf entry 6 itf -1 flags ==================== TCP ==================== Packet 12 00:10:21:474191: dpdk-input GigabitEthernet13/0/0 rx queue 0 buffer 0x6441: current data 14, length 60, free-list 0, clone-count 0, totlen-nifb 0, trace 0xb ext-hdr-valid l4-cksum-computed l4-cksum-correct l2-hdr-offset 0 l3-hdr-offset 14 PKT MBUF: port 0, nb_segs 1, pkt_len 74 buf_len 2176, data_len 74, ol_flags 0x0, data_off 128, phys_addr 0x3fd910c0 packet_type 0x10 l2_len 0 l3_len 0 outer_l2_len 0 outer_l3_len 0 Packet Types RTE_PTYPE_L3_IPV4 (0x0010) IPv4 packet without extension headers IP4: 00:0c:29:3a:39:d7 -> 00:0c:29:d6:93:93 TCP: 1.1.1.1 -> 2.2.2.2 tos 0xc0, ttl 255, length 60, checksum 0x74f6 fragment id 0x0000, flags DONT_FRAGMENT TCP: 646 -> 57413 seq. 0xbb729c35 ack 0x6382b56c flags 0x12 SYN ACK, tcp header: 40 bytes window 28960, checksum 0x5590 00:10:21:474204: ip4-input TCP: 1.1.1.1 -> 2.2.2.2 tos 0xc0, ttl 255, length 60, checksum 0x74f6 fragment id 0x0000, flags DONT_FRAGMENT TCP: 646 -> 57413 seq. 0xbb729c35 ack 0x6382b56c flags 0x12 SYN ACK, tcp header: 40 bytes window 28960, checksum 0x5590 00:10:21:474216: ip4-lookup fib 0 dpo-idx 0 flow hash: 0x00000000 TCP: 1.1.1.1 -> 2.2.2.2 tos 0xc0, ttl 255, length 60, checksum 0x74f6 fragment id 0x0000, flags DONT_FRAGMENT TCP: 646 -> 57413 seq. 0xbb729c35 ack 0x6382b56c flags 0x12 SYN ACK, tcp header: 40 bytes window 28960, checksum 0x5590 00:10:21:474231: ip4-drop TCP: 1.1.1.1 -> 2.2.2.2 tos 0xc0, ttl 255, length 60, checksum 0x74f6 fragment id 0x0000, flags DONT_FRAGMENT TCP: 646 -> 57413 seq. 0xbb729c35 ack 0x6382b56c flags 0x12 SYN ACK, tcp header: 40 bytes window 28960, checksum 0x5590 00:10:21:474233: error-drop ip4-input: valid ip4 packets what is the problem?? -=-=-=-=-=-=-=-=-=-=-=- Links: You receive all messages sent to this group. View/Reply Online (#9632): https://lists.fd.io/g/vpp-dev/message/9632 Mute This Topic: https://lists.fd.io/mt/22394233/21656 Group Owner: vpp-dev+ow...@lists.fd.io Unsubscribe: https://lists.fd.io/g/vpp-dev/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-