diff --git a/ChangeLog.md b/ChangeLog.md
index 6ac8d0c..8f1eba9 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -81,6 +81,10 @@ repository history](https://github.com/ddclient/ddclient/commits/master).
     [#670](https://github.com/ddclient/ddclient/pull/670)
   * Fixed DNSExit provider when configured with a zone and non-identical
     hostname.  [#673](https://github.com/ddclient/ddclient/issues/673)
+  * `infomaniak`: Fixed frequent forced updates after 25 days (`max-interval`).
+    [#691](https://github.com/ddclient/ddclient/issues/691)
+  * `regfishde`: Fixed IPv6 support.
+    [#691](https://github.com/ddclient/ddclient/issues/691)
 
 ## 2023-11-23 v3.11.2
 
diff --git a/ddclient.in b/ddclient.in
index 0f4cf74..88419a6 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -210,9 +210,9 @@ our %builtinweb = (
 
 sub query_cisco {
     my ($h, $asa, $v4) = @_;
-    warning("'--if' is deprecated for '--usev4=ifv4; use '--ifv4' instead")
+    warning("'--if' is deprecated for '--usev4=cisco%s; use '--ifv4' instead", $asa ? '-asa' : '')
         if ($v4 && !defined(opt('ifv4')) && defined(opt('if', $h)));
-    warning("'--fw' is deprecated for '--usev4=fwv4; use '--fwv4' instead")
+    warning("'--fw' is deprecated for '--usev4=cisco%s; use '--fwv4' instead", $asa ? '-asa' : '')
         if ($v4 && !defined(opt('fwv4')) && defined(opt('fw', $h)));
     my $if = ($v4 ? opt('ifv4', $h) : undef) // opt('if', $h);
     my $fw = ($v4 ? opt('fwv4', $h) : undef) // opt('fw', $h);
@@ -1323,9 +1323,9 @@ sub main {
 
         fatal("invalid argument '--use=%s'; possible values are:\n%s",
               $opt{'use'}, join("\n", ip_strategies_usage()))
-            unless exists $ip_strategies{lc opt('use')};
+            if defined(opt('use')) && !$ip_strategies{lc(opt('use'))};
         if (defined($opt{'usev6'})) {
-            usage("invalid argument '--usev6=%s'; possible values are:\n%s",
+            fatal("invalid argument '--usev6=%s'; possible values are:\n%s",
                   $opt{'usev6'}, join("\n", ipv6_strategies_usage()))
                 unless exists $ipv6_strategies{lc opt('usev6')};
         }
@@ -1565,7 +1565,7 @@ sub write_recap {
                 $recap{$h}{$v} = $config{$h}{$v};
             }
         } else {
-            for my $v (qw(atime wtime status)) {
+            for my $v (qw(atime wtime status status-ipv4 status-ivp6)) {
                 $recap{$h}{$v} = $config{$h}{$v};
             }
         }
@@ -1620,7 +1620,7 @@ sub read_recap {
 
         for my $h (keys(%recap)) {
             next if !exists($config->{$h});
-            for (qw(atime mtime wtime ip status)) {
+            for (qw(atime mtime wtime ip ipv4 ipv6 status status-ipv4 status-ipv6)) {
                 # TODO: Isn't $config equal to \%recap here?  If so, this is a no-op.  What was the
                 # original intention behind this?  To copy %recap values into %config?  If so, is
                 # it better to just delete this and live with the current behavior (which doesn't
@@ -2019,8 +2019,8 @@ sub init_config {
   HOST:
     for my $h (keys %config) {
         my $proto = opt('protocol', $h);
-        load_sha1_support($proto) if (grep(/^$proto$/, ("freedns", "nfsn")));
-        load_json_support($proto) if (grep(/^$proto$/, ("1984", "cloudflare", "digitalocean", "gandi", "godaddy", "hetzner", "yandex", "nfsn", "njalla", "porkbun", "dnsexit2")));
+        load_sha1_support($proto) if (grep($_ eq $proto, ("freedns", "nfsn")));
+        load_json_support($proto) if (grep($_ eq $proto, ("1984", "cloudflare", "digitalocean", "gandi", "godaddy", "hetzner", "yandex", "nfsn", "njalla", "porkbun", "dnsexit2")));
 
         if (!exists($protocols{$proto})) {
             warning("skipping host: %s: unrecognized protocol '%s'", $h, $proto);
@@ -2101,9 +2101,10 @@ sub test_possible_ip {
     local $opt{'debug'} = 0;
 
     printf "----- Test_possible_ip with 'get_ip' -----\n";
-    printf "use=ip, ip=%s address is %s\n", opt('ip'), get_ip('ip') // 'NOT FOUND'
-        if defined opt('ip');
-
+    if (defined(opt('ip'))) {
+        local $opt{'use'} = 'ip';
+        printf "use=ip, ip=%s address is %s\n", opt('ip'), get_ip('ip') // 'NOT FOUND';
+    }
     {
         local $opt{'use'} = 'if';
         # Note: The `ip` command adds a `@eth0` suffix to the names of VLAN
@@ -2127,7 +2128,7 @@ sub test_possible_ip {
             }
         }
         local $opt{'use'} = 'fw';
-        printf "use=fw, fw=%s address is %s\n", opt('fw'), get_ip(opt('fw')) // 'NOT FOUND'
+        printf "use=fw, fw=%s address is %s\n", opt('fw'), get_ip('fw') // 'NOT FOUND'
             if !exists $builtinfw{opt('fw')};
 
     }
@@ -2147,10 +2148,12 @@ sub test_possible_ip {
 
     # Now force IPv4
     printf "----- Test_possible_ip with 'get_ipv4' ------\n";
-    printf "use=ipv4, ipv4=%s address is %s\n", opt('ipv4'), get_ipv4('ipv4') // 'NOT FOUND'
-        if defined opt('ipv4');
-
+    if (defined(opt('ipv4'))) {
+        local $opt{'usev4'} = 'ipv4';
+        printf "usev4=ipv4, ipv4=%s address is %s\n", opt('ipv4'), get_ipv4('ipv4') // 'NOT FOUND';
+    }
     {
+        local $opt{'usev4'} = 'ifv4';
         # Note: The `ip` command adds a `@eth0` suffix to the names of VLAN
         # interfaces. That `@eth0` suffix is NOT part of the interface name.
         my @ifs = map({ /^[^\s:]*:\s*([^\s:@]+)/ ? $1 : () }
@@ -2161,30 +2164,32 @@ sub test_possible_ip {
         warning("failed to get list of interfaces") if !@ifs;
         for my $if (@ifs) {
             local $opt{'ifv4'} = $if;
-            printf "use=ifv4, ifv4=%s address is %s\n", opt('ifv4'), get_ipv4('ifv4') // 'NOT FOUND';
+            printf "usev4=ifv4, ifv4=%s address is %s\n", opt('ifv4'), get_ipv4('ifv4') // 'NOT FOUND';
         }
     }
     {
         local $opt{'usev4'} = 'webv4';
         for my $web (sort keys %builtinweb) {
             local $opt{'webv4'} = $web;
-            printf "use=webv4, webv4=$web address is %s\n", get_ipv4('webv4') // 'NOT FOUND'
+            printf "usev4=webv4, webv4=$web address is %s\n", get_ipv4('webv4') // 'NOT FOUND'
                 if ($web !~ "6")  ## Don't bother if web site only supports IPv6;
         }
-        printf "use=webv4, webv4=%s address is %s\n", opt('webv4'), get_ipv4('webv4') // 'NOT FOUND'
+        printf "usev4=webv4, webv4=%s address is %s\n", opt('webv4'), get_ipv4('webv4') // 'NOT FOUND'
             if ! exists $builtinweb{opt('webv4')};
     }
     if (opt('cmdv4')) {
         local $opt{'usev4'} = 'cmdv4';
-        printf "use=cmdv4, cmdv4=%s address is %s\n", opt('cmdv4'), get_ipv4('cmdv4') // 'NOT FOUND';
+        printf "usev4=cmdv4, cmdv4=%s address is %s\n", opt('cmdv4'), get_ipv4('cmdv4') // 'NOT FOUND';
     }
 
     # Now force IPv6
     printf "----- Test_possible_ip with 'get_ipv6' -----\n";
-    printf "use=ipv6, ipv6=%s address is %s\n", opt('ipv6'), get_ipv6('ipv6') // 'NOT FOUND'
-        if defined opt('ipv6');
-
+    if (defined(opt('ipv6'))) {
+        local $opt{'usev6'} = 'ipv6';
+        printf "usev6=ipv6, ipv6=%s address is %s\n", opt('ipv6'), get_ipv6('ipv6') // 'NOT FOUND';
+    }
     {
+        local $opt{'usev6'} = 'ifv6';
         # Note: The `ip` command adds a `@eth0` suffix to the names of VLAN
         # interfaces. That `@eth0` suffix is NOT part of the interface name.
         my @ifs = map({ /^[^\s:]*:\s*([^\s:@]+)/ ? $1 : () }
@@ -2195,22 +2200,22 @@ sub test_possible_ip {
         warning("failed to get list of interfaces") if !@ifs;
         for my $if (@ifs) {
             local $opt{'ifv6'} = $if;
-            printf "use=ifv6, ifv6=%s address is %s\n", opt('ifv6'), get_ipv6('ifv6') // 'NOT FOUND';
+            printf "usev6=ifv6, ifv6=%s address is %s\n", opt('ifv6'), get_ipv6('ifv6') // 'NOT FOUND';
         }
     }
     {
         local $opt{'usev6'} = 'webv6';
         for my $web (sort keys %builtinweb) {
             local $opt{'webv6'} = $web;
-            printf "use=webv6, webv6=$web address is %s\n", get_ipv6('webv6') // 'NOT FOUND'
+            printf "usev6=webv6, webv6=$web address is %s\n", get_ipv6('webv6') // 'NOT FOUND'
                 if ($web !~ "4");  ## Don't bother if web site only supports IPv4
         }
-        printf "use=webv6, webv6=%s address is %s\n", opt('webv6'), get_ipv6('webv6') // 'NOT FOUND'
+        printf "usev6=webv6, webv6=%s address is %s\n", opt('webv6'), get_ipv6('webv6') // 'NOT FOUND'
             if ! exists $builtinweb{opt('webv6')};
     }
     if (opt('cmdv6')) {
         local $opt{'usev6'} = 'cmdv6';
-        printf "use=cmdv6, cmdv6=%s address is %s\n", opt('cmdv6'), get_ipv6('cmdv6') // 'NOT FOUND';
+        printf "usev6=cmdv6, cmdv6=%s address is %s\n", opt('cmdv6'), get_ipv6('cmdv6') // 'NOT FOUND';
     }
 
     exit 0 unless opt('debug');
@@ -3926,7 +3931,7 @@ sub nic_dyndns2_force_update {
         info("forcing updating %s because 'mx' has changed to %s.", $host, $config{$host}{'mx'});
         $update = 1;
 
-    } elsif ($config{$host}{'mx'} && (ynu($config{$host}{'backupmx'}, 1, 2, 3) ne ynu($config{$host}{'backupmx'}, 1, 2, 3))) {
+    } elsif ($config{$host}{'mx'} && (ynu($config{$host}{'backupmx'}, 1, 2, 3) ne ynu($recap{$host}{'backupmx'}, 1, 2, 3))) {
         info("forcing updating %s because 'backupmx' has changed to %s.", $host, ynu($config{$host}{'backupmx'}, "YES", "NO", "NO"));
         $update = 1;
 
@@ -5242,7 +5247,7 @@ sub nic_njalla_update {
         # Read input params
         my $ipv4 = delete $config{$h}{'wantipv4'};
         my $ipv6 = delete $config{$h}{'wantipv6'};
-        my $quietreply = delete $config{$h}{'quietreply'};
+        my $quietreply = $config{$h}{'quietreply'};
         my $ip_output = '';
 
         # Build url
@@ -7699,13 +7704,13 @@ sub nic_regfishde_update {
 
     ## update configured host
     for my $h (@_) {
-        my $ip = delete $config{$h}{'wantip'};
-        my $ipv6 = delete $config{$h}{'wantip'};
-
-        info("regfish.de setting IP address to %s for %s", $ip, $h);
-
-        my $ipv = ($ip eq ($ipv6 // '')) ? '6' : '4';
-        my $url = "https://$config{$h}{'server'}/?fqdn=$h&ipv$ipv=$ip&forcehost=1&token=$config{$h}{'password'}";
+        my $ipv4 = delete $config{$h}{'wantipv4'};
+        my $ipv6 = delete $config{$h}{'wantipv6'};
+        info("regfish.de setting IPv4 address to %s for %s", $ipv4, $h) if $ipv4;
+        info("regfish.de setting IPv6 address to %s for %s", $ipv6, $h) if $ipv6;
+        my $url = "https://$config{$h}{'server'}/?fqdn=$h&forcehost=1&token=$config{$h}{'password'}";
+        $url .= "&ipv4=$ipv4" if $ipv4;
+        $url .= "&ipv6=$ipv6" if $ipv6;
 
         # Try to get URL
         my $reply = geturl(proxy => opt('proxy'), url => $url);
@@ -7716,16 +7721,17 @@ sub nic_regfishde_update {
             last;
         }
         last if !header_ok($h, $reply);
-
-        if ($reply =~ /success/) {
-            $config{$h}{'ip'} = $ip;
-            $config{$h}{'mtime'} = $now;
-            $config{$h}{'status'} = 'good';
-            success("updating %s: good: IP address set to %s", $h, $ip);
-        } else {
-            $config{$h}{'status'} = 'failed';
-            failed("updating %s: Server said: '$reply'", $h);
+        if ($reply !~ /success/) {
+            failed("updating %s: Server said: '%s'", $h, $reply);
+            next;
         }
+        $config{$h}{'ipv4'} = $ipv4 if $ipv4;
+        $config{$h}{'ipv6'} = $ipv6 if $ipv6;
+        $config{$h}{'status-ipv4'} = 'good' if $ipv4;
+        $config{$h}{'status-ipv6'} = 'good' if $ipv6;
+        $config{$h}{'mtime'} = $now;
+        success("updating %s: good: IPv4 address set to %s", $h, $ipv4) if $ipv4;
+        success("updating %s: good: IPv6 address set to %s", $h, $ipv6) if $ipv6;
     }
 }
 
@@ -8037,7 +8043,7 @@ sub nic_infomaniak_update {
                 if (defined $updated && $updated) {
                     info($msg);
                     $config{$h}{"ipv$v"} = $ip;
-                    $config{$h}{'mtime'} = $config{$h}{'mtime'} // $now;
+                    $config{$h}{'mtime'} = $now;
                     $config{$h}{"status-ipv$v"} = 'good';
                     next INFOMANIAK_IP_LOOP;
                 }