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diff --git a/server/confpars.c b/server/confpars.c
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index 12ab0e6..4454be9 100644
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--- a/server/confpars.c
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+++ b/server/confpars.c
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@@ -3756,6 +3756,19 @@ add_ipv6_pool_to_subnet(struct subnet *subnet, u_int16_t type,
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 	share->ipv6_pools[num_pools+1] = NULL;
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 }
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+static void
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+check_addr_in_subnet(struct subnet *subnet, struct iaddr *addr) {
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+	char lowbuf [INET6_ADDRSTRLEN], netbuf [INET6_ADDRSTRLEN];
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+
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+	if (!addr_eq(subnet->net, subnet_number(*addr, subnet->netmask))) {
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+		strcpy(lowbuf, piaddr(*addr));
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+		strcpy(netbuf, piaddr(subnet->net));
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+		log_fatal("bad range6, address %s not in subnet6 %s/%d",
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+			lowbuf, netbuf, subnet->prefix_len);
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+	}
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+
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+}
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+
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 /* address-range6-declaration :== ip-address6 ip-address6 SEMI
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 			       | ip-address6 SLASH number SEMI
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 			       | ip-address6 [SLASH number] TEMPORARY SEMI */
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@@ -3788,6 +3801,8 @@ parse_address_range6(struct parse *cfile, struct group *group) {
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 		return;
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 	}
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+	check_addr_in_subnet(group->subnet, &lo);
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+
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 	/* 
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 	 * See if we we're using range or CIDR notation or TEMPORARY
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 	 */
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@@ -3855,6 +3870,8 @@ parse_address_range6(struct parse *cfile, struct group *group) {
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 			return;
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 		}
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+		check_addr_in_subnet(group->subnet, &hi;;
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+
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 		/*
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 		 * Convert our range to a set of CIDR networks.
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 		 */