fix max ipset name lenght

diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 727204a733afd20fe7780456495ecbfd0f388a60..2270ad73eb159bb36699c3e9215c0d632c4cbab4 100644 (file)
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -760,7 +760,10 @@ sub local_network {
     return $__local_network;
 }
 
-my $max_iptables_ipset_name_length = 27;
+# ipset names are limited to 31 characters, and we use '_swap' 
+# suffix for atomic update, for example PVEFW-${VMID}-${ipset_name}_swap
+
+my $max_iptables_ipset_name_length = 31 - length("_swap");
 
 sub compute_ipset_chain_name {
     my ($vmid, $ipset_name) = @_;