--- zzzz-none-000/linux-4.9.325/net/ipv4/ipconfig.c 2022-07-29 15:05:48.000000000 +0000 +++ seale-7590ax-800/linux-4.9.325/net/ipv4/ipconfig.c 2024-09-18 09:50:48.000000000 +0000 @@ -455,6 +455,8 @@ ic_netmask = htonl(IN_CLASSB_NET); else if (IN_CLASSC(ntohl(ic_myaddr))) ic_netmask = htonl(IN_CLASSC_NET); + else if (IN_CLASSE(ntohl(ic_myaddr))) + ic_netmask = htonl(IN_CLASSE_NET); else { pr_err("IP-Config: Unable to guess netmask for address %pI4\n", &ic_myaddr);