On 16.03.2018 14:47, sth...@nethelp.no wrote: >> And thank you for that suggestion! The packet loss during ARP refresh >> (of the destination address connected to the output interface) does >> *not* happen when the box is forwarding! It only happens with locally >> generated traffic. > > Checking once per second with "arp -n <destination IP>" I can see the > following behavior with net.link.ether.inet.max_age=120: > > - Locally generated traffic: The ARP entry is refreshed after > net.link.ether.inet.max_age seconds - which presumably means it > actually expires first. And there is some packet loss. > > - Transit traffic (the box is forwarding): The ARP entry is refreshed > 5 seconds *before* net.link.ether.inet.max_age has passed, and there > is no packet loss.
Can you test this patch? I did not tested it, but I think it should fix this issue. -- WBR, Andrey V. Elsukov
Index: sys/net/if_ethersubr.c
===================================================================
--- sys/net/if_ethersubr.c (revision 330791)
+++ sys/net/if_ethersubr.c (working copy)
@@ -317,6 +317,17 @@ ether_output(struct ifnet *ifp, struct mbuf *m,
phdr = lle->r_linkdata;
hlen = lle->r_hdrlen;
pflags = lle->r_flags;
+ /*
+ * XXX: Check if we have feedback request
+ * from arptimer()/nd6_llinfo_timer().
+ */
+ if ((pflags & RLLE_VALID) &&
+ lle->r_skip_req != 0) {
+ LLE_REQ_LOCK(lle);
+ /* Notify that entry was used */
+ lle->r_skip_req = 0;
+ LLE_REQ_UNLOCK(lle);
+ }
}
}
}
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