diff --git a/components/lwip/port/hooks/lwip_default_hooks.c b/components/lwip/port/hooks/lwip_default_hooks.c
index b8b5bcc79ee..7c825fcc972 100644
--- a/components/lwip/port/hooks/lwip_default_hooks.c
+++ b/components/lwip/port/hooks/lwip_default_hooks.c
@@ -220,6 +220,9 @@ void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uin
     NETIF_FOREACH(netif) {
       /* find the netif related to this dhcp */
       if (dhcp == netif_dhcp_data(netif)) {
+        if (mtu < 68) { /* RFC 2132 requires MTU >= 68 */
+          return;
+        }
         if (mtu < netif->mtu) {
           netif->mtu = mtu;
           LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_parse_extra_opts(): Negotiated netif MTU is %d\n", netif->mtu));