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

["Stephan Seitz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-9598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15824744#comment-15824744 ] 

Stephan Seitz commented on CLOUDSTACK-9598:
-------------------------------------------

Rafael,

we've noticed the change after upgrading 4.9.0.1 to 4.9.1. The particular
ACS was originally setup as 4.5 and upgraded to 4.6, 4.7, 4.8, 4.9, 4.9.0.1
and finally 4.9.1.

Obviously, we relied on a long existing bug ;) as the new behaviour does make
sense. But most of our vm's are intentionally equipped with multiple
routing tables and require the default-gateway announced from every attached
network.

By now, we've patched the CsDhcp.py inside systemvm.iso/cloud-scripts.tgz as
we didn't find any configuration option.

cheers,

- Stephan



> 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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