1. VPP send wrong IPv6 router advertisement with bad preferred lifetime, and valid lifetime. In RA, these two lifetime in every packet router sent should be the same as settings, but the lifetime in RA sent by vpp keeps declining as time pass. It is as if there is a counter like client count down to zero from given lifetime. this occurs when ip6 nd <INTERFACE> ra-managed-config-flag ip6 nd <INTERFACE> ra-other-config-flag ip6 nd <INTERFACE> prefix <SOME PREFIX>/64 default
a successful workaround by set lifetime to infinite and then set to desired value. ip6 nd <INTERFACE> ra-managed-config-flag ip6 nd <INTERFACE> ra-other-config-flag ip6 nd <INTERFACE> prefix <SOME PREFIX>/64 default ip6 nd <INTERFACE> prefix <SOME PREFIX>/64 infinite ip6 nd <INTERFACE> prefix <SOME PREFIX>/64 2592000 604800 2. VPP send out neighbor advertisement is bad when receive solicitation, ie they don't have router bit set, and there is no command to change this behavior. This would cause windows client loss ipv6 gateway when received neighbor advertisement. Seems problems with src/vnet/ip6-nd/ip6_nd.c ( https://github.com/FDio/vpp/blob/cbe25aab3be72154f2c706c39eeba6a77f34450f/src/vnet/ip6-nd/ip6_nd.c ) src/vnet/l2/l2_arp_term.c ( https://github.com/FDio/vpp/blob/cbe25aab3be72154f2c706c39eeba6a77f34450f/src/vnet/l2/l2_arp_term.c ) src/vnet/lisp-cp/control.c ( https://github.com/FDio/vpp/blob/3ec09e9243dceb78e7548725281b0da8eddf72b1/src/vnet/lisp-cp/control.c ) I think there might should be (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE); instead of (ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED | ICMP6_NEIGHBOR_ADVERTISEMENT_FLAG_OVERRIDE);
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