I’m getting a constant flow (about 1 packet per second) of these ICMP network packets (See below). Can anyone enlighten me as to what is happening? My droplet is 104.236.22.84 and the address (52.19.78.160) changes in almost every packet. Thanks in advance.

tcpdump -nv icmp

14:31:28.860085 IP (tos 0xc0, ttl 64, id 4507, offset 0, flags [none], proto ICMP (1), length 80)
104.236.22.84 > 52.19.78.160: ICMP host 104.236.22.84 unreachable - admin prohibited, length 60
IP (tos 0x0, ttl 113, id 31537, offset 0, flags [DF], proto TCP (6), length 52)
52.19.78.160.56610 > 104.236.22.84.ssh: Flags [S], cksum 0xb79e (correct), seq 1121351023, win 8192, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0

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2 answers

The network capture you provided us shows your droplet sending an ICMP packet to 52.19.78.160 with reason “unreachable - admin prohibited”, presumably in regards to another connection attempt or packet.

  • Thank you for replying.

    I think I get that part, but just below that line, where the foreign ip begins (52.19.78.160), was that the original request? It appears to be directed to my port 22. Does this mean I’m getting a portscan on 22 this frequently?

Here is a

tcpdump -nv tcp

20:24:08.884069 IP (tos 0x0, ttl 118, id 4251, offset 0, flags [DF], proto TCP (6), length 48)
52.29.84.6.54728 > 104.236.22.84.ssh: Flags [S], cksum 0xe091 (correct), seq 1478118705, win 8192, options [mss 1460,nop,nop,sackOK], length 0

So I guess they are coming in tcp and the response going back out is icmp?

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