ndp_timer() is called right away on the first epoll_wait() cycle,
when the communication channel to the guest isn't ready yet:
1.0038: NDP: sending unsolicited RA, next in 264s
1.0038: tap: failed to send 1 frames of 1
check that it's up before sending it. This effectively delays the
first gratuitous router advertisement, which is probably a good idea
given that we expect the guest to send a router solicitation right
away.
Fixes: 6e1e44293ef9 ("ndp: Send unsolicited Router Advertisements")
Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com>
---
ndp.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/ndp.c b/ndp.c
index 7ee44b2..b458785 100644
--- a/ndp.c
+++ b/ndp.c
@@ -420,9 +420,12 @@ void ndp_timer(const struct ctx *c, const struct timespec *now)
interval = min_rtr_adv_interval +
random() % (max_rtr_adv_interval - min_rtr_adv_interval);
- info("NDP: sending unsolicited RA, next in %llds", (long long)interval);
+ if (next_ra) {
+ info("NDP: sending unsolicited RA, next in %llds",
+ (long long)interval);
- ndp_ra(c, &in6addr_ll_all_nodes);
+ ndp_ra(c, &in6addr_ll_all_nodes);
+ }
next_ra = now->tv_sec + interval;
}
--
2.43.0