diff --git a/srcs/service/dhcpd/dhcpd_network.c b/srcs/service/dhcpd/dhcpd_network.c
index 954c6ff..b087c2d 100644
--- a/srcs/service/dhcpd/dhcpd_network.c
+++ b/srcs/service/dhcpd/dhcpd_network.c
@@ -290,7 +290,7 @@ static PDHCP_PROTO fill_pkg(U8 *pRsp, U8 *pReq) {
     switch (get_package_vlan_type(pReq)) {
         default:
             pIp   = (struct iphdr *)(pReq + IP_HDR_OFFSET);
-            pUdp  = (struct udphdr *)(UDP_HDR_OFFSET);
+            pUdp  = (struct udphdr *)(pReq + UDP_HDR_OFFSET);
             pDhcp = (PDHCP_PROTO)((U8 *)pReq + DHCP_OFFSET);
             p     = pRsp + sizeof(struct ethhdr);
             break;
@@ -330,7 +330,7 @@ static int dhcp_prepare_tx(U8 *pRsp, U32 optSize) {
     switch (get_package_vlan_type(pRsp)) {
         default:
             pIp     = (struct iphdr *)(pRsp + IP_HDR_OFFSET);
-            pUdp    = (struct udphdr *)(UDP_HDR_OFFSET);
+            pUdp    = (struct udphdr *)(pRsp + UDP_HDR_OFFSET);
             // 计算包总长度
             tolSize = optSize + sizeof(DHCP_PROTO) + DHCP_OFFSET;
             break;