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From "Murali Reddy (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLOUDSTACK-9598) wrong defaut gateway in guest VM with nics in isolated and a shared network
Date Tue, 15 Nov 2016 20:19:59 GMT
Murali Reddy created CLOUDSTACK-9598:
----------------------------------------

             Summary: wrong defaut gateway in guest VM with nics in isolated and a shared
network
                 Key: CLOUDSTACK-9598
                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9598
             Project: CloudStack
          Issue Type: Bug
      Security Level: Public (Anyone can view this level - this is the default.)
    Affects Versions: 4.9.0
            Reporter: Murali Reddy
             Fix For: 4.10.0.0, 4.9.1.0


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.

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




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