Comment 3 for bug 1680167

It's a HP address block: https://apps.db.ripe.net/search/query.html?searchtext=15.184.64.1#resultsAnchor

Network config looks ok to me, netmask looks correct for the gateway...

2017-06-28 13:06:28.946228 | "networks": [
2017-06-28 13:06:28.946249 | {
2017-06-28 13:06:28.946278 | "id": "network0",
2017-06-28 13:06:28.946312 | "ip_address": "15.184.67.60",
2017-06-28 13:06:28.946346 | "link": "tap6088de7e-d9",
2017-06-28 13:06:28.946379 | "netmask": "255.255.224.0",
2017-06-28 13:06:28.946422 | "network_id": "85ba3bb6-1fd9-443e-beb8-e9733147218d",
2017-06-28 13:06:28.946449 | "routes": [
2017-06-28 13:06:28.946473 | {
2017-06-28 13:06:28.946508 | "gateway": "15.184.64.1",
2017-06-28 13:06:28.946542 | "netmask": "0.0.0.0",
2017-06-28 13:06:28.946575 | "network": "0.0.0.0"
2017-06-28 13:06:28.946599 | }
2017-06-28 13:06:28.946622 | ],
2017-06-28 13:06:28.946650 | "type": "ipv4"
2017-06-28 13:06:28.946671 | }
2017-06-28 13:06:28.946690 | ],

I'd guess the gateway just isn't responding to ICMP packets sometimes. High load maybe?