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tests","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/openstack-ansible-openstack_hosts/commit/5bcdae890467e4c0e35c199c67b4ea10dd42b391"}]}],"author":{"name":"Jonathan Rosser","email":"jonathan.rosser@rd.bbc.co.uk","date":"2020-08-04 16:34:20.000000000","tz":60},"committer":{"name":"Jonathan Rosser","email":"jonathan.rosser@rd.bbc.co.uk","date":"2020-08-24 06:07:17.000000000","tz":0},"subject":"Increase default value of net.ipv4.igmp_max_memberships","message":"Increase default value of net.ipv4.igmp_max_memberships\n\nThe linux kernel default for igmp_max_memberships is 20 [0].\n\nFor vxlan project networks, it is possible to specify a range\nof multicast addresses for use with VXLAN tunnel broadcast traffic.\nIn the case where a range is specified a unique multicast group\nis assigned by neutron to each vxlan network, and once\nigmp_max_memberships is reached for a host, vxlan interfaces will\nsilently fail to join the multicast group.\n\nThis results in instances being unable to DHCP or ARP, and errors\nin the neutron agent log [1].\n\nThis patch increases the default value to 1024 which should be\nsufficient for all but the very largest deployments.\n\n[0] https://sysctl-explorer.net/net/ipv4/igmp_max_memberships/\n[1] http://paste.openstack.org/show/796504\n\nChange-Id: I24a0ca3001098b278d341f710ca2e4f00dc3e09a\n(cherry picked from commit 7cbf51170c9ad25ac6a36ebc94561018a3b310b5)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/openstack-ansible-openstack_hosts/commit/825294cfd5e71f44580fbc8ac9795640adc3d8af"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/openstack-ansible-openstack_hosts/commit/825294cfd5e71f44580fbc8ac9795640adc3d8af"}]},"branch":"refs/heads/stable/ussuri"}},"requirements":[],"submit_records":[],"submit_requirements":[]}