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From "Murali Reddy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-9598) wrong defaut gateway in guest VM with nics in isolated and a shared network
Date Wed, 16 Nov 2016 05:15:59 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15669453#comment-15669453
] 

Murali Reddy commented on CLOUDSTACK-9598:
------------------------------------------

This is regression from 4.5 affecting 4.6 all the way to master.

/etc/dhcpopts.txt is not used and contents are empty from 4.6 though its specified in the
dnsmasq.conf as dhcp-optsfile. Adding entry for dhcp options 3,6,15 in dhcpopts.txt  solves
the problem.

> 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: 4.6.2, 4.7.1, 4.8.0, 4.9.0
>            Reporter: Murali Reddy
>             Fix For: 4.8.1, 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 [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



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