[CLOUDSTACK-9598] wrong defaut gateway in guest VM with nics in isolated and a shared network

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.6.2, 4.7.1, 4.8.0, 4.9.0
• Fix Version/s: 4.8.1, 4.10.0.0, 4.9.1.0
• Security Level: Public (Anyone can view this level - this is the default.)
• Assignee: Unassigned
• Reporter: Murali Reddy
• Created: 15/Nov/16 20:19
• Updated: 17/Mar/17 16:23
• Resolved: 17/Mar/17 16:23

Description

When a guest instance is created with nic's in a isolated network and a shared network (with just DHCP and DNS), with isolated network as default network, DHCP lease on shared network from the shared network VR has wrong gateway. gateway is pointed to the virtual router IP.

/etc/cloudstack/dhcpentry.json in shared network VR will have default gateway set to 0.0.0.0

root@r-11-VM:~# cat /etc/cloudstack/dhcpentry.json
{
"10.6.9.165":

{ "default_entry": false, "default_gateway": "0.0.0.0", "dns_adresses": "10.1.1.1", "host_name": "VM-fce34d73-dc99-4559-b077-64711509907a", "ipv4_adress": "10.6.9.165", "ipv6_duid": "00:03:00:01:06:5a:da:00:00:6a", "mac_address": "06:5a:da:00:00:6a", "type": "dhcpentry" }

,
"id": "dhcpentry"

DhcpCommand network element command sent from the management server is like below with "defaultRouter":"0.0.0.0"

2016-11-15 19:15:29,319 DEBUG [c.c.a.t.Request] (Work-Job-Executor-25:ctx-a9aca0bb job-69/job-70 ctx-82c3fd7e) (logid:6ca37cdb) Seq 2-4650811040190170578: Sending { Cmd , MgmtId: 7150818625286, via: 2(trl-202-k-cs49-mreddy-kvm2), Ver: v1, Flags: 100011, [{"com.cloud.agent.api.routing.DhcpEntryCommand":{"vmMac":"06:5a:da:00:00:6a","vmIpAddress":"10.6.9.165","vmName":"VM-fce34d73-dc99-4559-b077-64711509907a","defaultRouter":"0.0.0.0","defaultDns":"10.1.1.1","duid":"00:03:00:01:06:5a:da:00:00:6a","isDefault":false,"executeInSequence":false,"accessDetails":

{"zone.network.type":"Advanced","router.guest.ip":"10.6.9.164","router.ip":"169.254.2.18","router.name":"r-11-VM"}

,"wait":0}}] }

NIC details in the DB for the nic in the shared network has correct gateway.

Gateway is set to 0.0.0.0, for every non-default nic [1]

In case where shared network is non default network, then guest VM will end up treating VR in the shared network as gateway instead of actual shared network gateway.

[1] https://github.com/apache/cloudstack/blob/4.9/server/src/com/cloud/network/router/CommandSetupHelper.java#L224

Issue Links

• is duplicated by: CLOUDSTACK-9562 Linux Guest VM get wrong default route when there are multiple Nic with a nic with vpc
• links to: GitHub Pull Request #1766