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From Rohit Yadav <>
Subject Re: Please merge DOCs
Date Sat, 11 Nov 2017 16:46:42 GMT
Merged, thanks.

Get Outlook for Android<>

From: Andrija Panic <>
Sent: Thursday, November 9, 2017 6:48:15 PM
Subject: Please merge DOCs

Default value of "net.ipv4.igmp_max_memberships" (cat
/proc/sys/net/ipv4/igmp_max_memberships) is "20", which means that host can
be joined to max 20 multicast groups (attach max 20 multicast IPs on the
host). Since all VXLAN (VTEP) interfaces provisioned on host are
multicast-based (belong to certain multicast group, and thus has it's own
multicast IP that is used as VTEP), this means that you can not provision
more than 20 (working) VXLAN interfaces per host. On Linux kernel 3.x you
actually can provision more than 20, but ARP request will silently fail and
cause client's networking problems On Linux kernel 4.x you can NOT
provision (start) more than 20 VXLAN interfaces and error message "No
buffer space available" can be observed in Cloudstack Agent logs after
provisioning required bridges and VXLAN interfaces. Increase needed
parameter to sane value (i.e. 100 or 200) as required. If you need to
operate more than 20 VMs from different client's network, this change above
is required.


Andrija Panić
53 Chandos Place, Covent Garden, London  WC2N 4HSUK

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