--- vida-0.8devel/dnspoofing.c	2003-06-28 14:02:28.000000000 +0200
+++ vida-0.8devel2/dnspoofing.c	2004-09-12 14:29:08.000000000 +0200
@@ -27,6 +27,9 @@
 /* change it if u want */
 #define IFACE "eth0"
 
+/* DNS UDP header is 12 bytes long */
+#define LIBNET_DNSV4_H 0x0c
+
 /* protos */
 int parse_dns(char *packet);
 void dnshijacker();
@@ -287,7 +290,8 @@
 
    info(0,"Spoofing the DNS query");
 
-   if ((libnet_build_dnsv4(ntohs(cc.dns_id),	/* dns id */
+   if ((libnet_build_dnsv4(LIBNET_DNSV4_H,      /* header size */
+			   ntohs(cc.dns_id),	/* dns id */
 			   0x8180,	/* control flags (QR,AA,RD,RA) */
 			   1,	/* number of questions */
 			   1,	/* number of answer RR's */

.