fix: some distros use ping6 instead of ping -6

config/scripts/.local/scripts/mtu-test

@@ -4,13 +4,30 @@ import sys
 import subprocess
 
 
-def ping(host, packet_size, is_ipv6=False):
+def has_ping6() -> bool:
+    try:
+        result = subprocess.run(['ping6', '-c', '1', '::1'],
+                                stdout=subprocess.DEVNULL,
+                                stderr=subprocess.DEVNULL)
+        return result.returncode == 0
+    except Exception:
+        return False
+
+
+def ping(host: str, packet_size: int, is_ipv6: bool = False) -> bool:
+    ping6 = has_ping6()
     if is_ipv6:
         header_size = 48  # 40 bytes IPv6 header + 8 bytes ICMPv6 header
-        cmd = ['ping', '-6', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
+        if ping6:
+            cmd = ['ping6', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
+        else:
+            cmd = ['ping', '-6', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
     else:
         header_size = 28  # 20 bytes IP header + 8 bytes ICMP header
-        cmd = ['ping', '-4', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
+        if ping6:
+            cmd = ['ping', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
+        else:
+            cmd = ['ping', '-4', '-c', '2', '-M', 'do', '-s', str(packet_size - header_size), host]
 
     try:
         result = subprocess.run(cmd, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
@@ -19,10 +36,10 @@ def ping(host, packet_size, is_ipv6=False):
         return False
 
 
-def bin_search_mtu(host, min_mtu, max_mtu, is_ipv6=False):
+def bin_search_mtu(host: str, min_mtu: int, max_mtu: int, is_ipv6: bool = False) -> int | None:
     l = min_mtu
     h = max_mtu
-    ret = 0
+    ret: int = 0
 
     print(f"Testing {'IPv6' if is_ipv6 else 'IPv4'} MTU for {host}...")
 
@@ -48,9 +65,9 @@ def main():
         print(f"Usage: {sys.argv[0]} <domain> [min_mtu max_mtu]")
         sys.exit(1)
 
-    domain = sys.argv[1]
-    min_search = sys.argv[2] if len(sys.argv) >= 4 else 1000
-    max_search = sys.argv[3] if len(sys.argv) >= 4 else 1500
+    domain: str = sys.argv[1]
+    min_search: int = int(sys.argv[2]) if len(sys.argv) >= 4 else 1000
+    max_search: int = int(sys.argv[3]) if len(sys.argv) >= 4 else 1500
 
     ipv4_mtu = bin_search_mtu(domain, min_search, max_search, is_ipv6=False)
     if ipv4_mtu: