Unable to reach the NSX Manager from the Jumphost
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Unable to reach the NSX Manager from the Jumphost

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Article ID: 427758

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Updated On:

Products

VMware NSX

Issue/Introduction

  • Unable to ping or SSH the NSX Manager from the Jumphost
  • NSX Manager is up and running with the cluster status stable
  • Packet capture indicate the NSX Manager is responding to the Ping request, but not reaching the ESXI host where the Jump host is present 

Host capture where NSX Manager was present.
-----------------------------------------------------------------
root@ESXIhost:~] pktcap-uw --uplink vmnic4 --proto 0x01 --capture UplinkSndKernel,UplinkRcvKernel -o - | tcpdump-uw -enr -| grep 10.x.x132
The name of the uplink is vmnic4.
The session filter IP protocol is 0x01.
The session capture point is UplinkSndKernel,UplinkRcvKernel.
pktcap: The output file is -.
pktcap: No server port specifed, select 48301 as the port.
pktcap: Local CID 2.
pktcap: Listen on port 48301.
pktcap: Main thread: 36745153728.
pktcap: Dump Thread: 36745684736.
pktcap: The output file format is pcapng.
reading from file -, link-type EN10MB (Ethernet)pktcap: Recv Thread: 36746213120.
, snapshot length 65535
pktcap: Accept...
pktcap: Vsock connection from port 1031 cid 2.
07:54:12.057160 00:00:10:03:09:59 > 00:#:#:#:#:92, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 11765, length 40
07:54:12.057234 00:#:#:#:#:92 > 00:#:#:#:#:09, ethertype IPv4 (0x0800), length 74: 10.x.x.87 > 10.x.x132: ICMP echo reply, id 13, seq 11765, length 40
07:54:16.669860 00:00:10:03:09:59 > 00:#:#:#:#:92, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 11770, length 40
07:54:16.669935 00:#:#:#:#:92 > 00:#:#:#:#:09, ethertype IPv4 (0x0800), length 74: 10.x.x.87 > 10.x.x132: ICMP echo reply, id 13, seq 11770, length 40
07:54:21.661616 00:00:10:03:09:59 > 00:#:#:#:#:92, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 11771, length 40
07:54:21.661703 00:#:#:#:#:92 > 00:#:#:#:#:09, ethertype IPv4 (0x0800), length 74: 10.x.x.87 > 10.x.x132: ICMP echo reply, id 13, seq 11771, length 40
07:54:31.490125 00:00:10:03:09:59 > 00:#:#:#:#:92, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 11776, length 40
07:54:31.490207 00:#:#:#:#:92 > 00:#:#:#:#:09, ethertype IPv4 (0x0800), length 74: 10.x.x.87 > 10.x.x132: ICMP echo reply, id 13, seq 11776, length 40
tcpdump-uw: pcap_loop: error reading dump file: Interrupted system call
pktcap: Receive thread exiting...
pktcap: error: Error writing 28 bytes of pkt header to file.
pktcap: Destroying session 2.
pktcap:
pktcap: Dumped 767 packet dropped 0 packets.
pktcap: Done.

Host capture where jumphost was present
---------------------------------------------------------

[root@ESXIhost:~] pktcap-uw --uplink vmnic1 --proto 0x01 --capture UplinkSndKernel,UplinkRcvKernel -o - | tcpdump-uw -enr -| grep 10.x.x.87
The name of the uplink is vmnic1.
The session filter IP protocol is 0x01.
The session capture point is UplinkSndKernel,UplinkRcvKernel.
pktcap: The output file is -.
pktcap: No server port specifed, select 44995 as the port.
pktcap: Local CID 2.
pktcap: Listen on port 44995.
pktcap: Main thread: 679209778048.
pktcap: Dump Thread: 679210313472.
pktcap: Recv Thread: 679210841856.
pktcap: Accept...
pktcap: Vsock connection from port 1032 cid 2.
reading from file -, link-type EN10MB (Ethernet)
08:25:18.555557 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12360, length 40
08:25:23.162825 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12365, length 40
08:25:28.168985 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12366, length 40
08:25:33.161599 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12369, length 40
08:25:38.171683 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12372, length 40
08:25:43.169705 00:#:#:#:#:2e > 02:#:#:#:#:55, ethertype IPv4 (0x0800), length 74: 10.x.x132 > 10.x.x.87: ICMP echo request, id 13, seq 12373, length 40
tcpdump-uw: pcap_loop: error reading dump file: Interrupted system call
pktcap: Join with dump thread failed.
pktcap: Destroying session 2.
pktcap:
pktcap: Dumped 19 packet to file -, dropped 0 packets.
pktcap: Done.

Environment

VMware NSX-T Data Center
VMware NSX

Cause

Duplicate mac address present in the arp table of the physical switch

Resolution

Clear the Duplicate mac address on the switch to have the proper connectivity 

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