Can you please try an attached patch?
Index: sys/netpfil/ipfw/ip_fw_dynamic.c
===================================================================
--- sys/netpfil/ipfw/ip_fw_dynamic.c (revision 245876)
+++ sys/netpfil/ipfw/ip_fw_dynamic.c (working copy)
@@ -980,8 +980,8 @@ ipfw_dyn_tick(void * vnetx)
chain = &V_layer3_chain;
- /* Run keepalive checks every keepalive_interval iff ka is enabled */
- if ((V_dyn_keepalive_last + V_dyn_keepalive_interval >= time_uptime) &&
+ /* Run keepalive checks every keepalive_period iff ka is enabled */
+ if ((V_dyn_keepalive_last + V_dyn_keepalive_period <= time_uptime) &&
(V_dyn_keepalive != 0)) {
V_dyn_keepalive_last = time_uptime;
check_ka = 1;
@@ -1320,7 +1320,7 @@ ipfw_dyn_init(struct ip_fw_chain *chain)
V_dyn_keepalive_interval = 20;
V_dyn_keepalive_period = 5;
V_dyn_keepalive = 1; /* do send keepalives */
- V_dyn_keepalive = time_uptime;
+ V_dyn_keepalive_last = time_uptime;
V_dyn_max = 4096; /* max # of dynamic rules */
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