Servus, I had the same problem here and posted it to the isdn4linux Mailing list. You need a patched kernel, and important, your ipppd has to be linked against libpcap-0.7.2 (my ipppd out of Debian sarge worked).
http://listserv.isdn4linux.de/pipermail/isdn4linux/2005-March/001319.html
diff -ur linux-2.6.8-9.org/drivers/isdn/i4l/isdn_ppp.c linux/drivers/isdn/i4l/isdn_ppp.c
--- linux-2.6.8-9.org/drivers/isdn/i4l/isdn_ppp.c 2004-08-14 07:37:25.000000000 +0200
+++ linux/drivers/isdn/i4l/isdn_ppp.c 2004-09-20 12:34:20.000000000 +0200
@@ -1152,7 +1152,7 @@
{
u_int16_t *p = (u_int16_t *) skb->data;
- *p = 0; /* indicate inbound in DLT_LINUX_SLL */
+ *p = 0; /* indicate inbound */
}
if (is->pass_filter
@@ -1293,12 +1293,12 @@
/* check if we should pass this packet
* the filter instructions are constructed assuming
* a four-byte PPP header on each packet */
- skb_push(skb, 4);
+ *skb_push(skb, 4) = 1; /* indicate outbound */
{
u_int16_t *p = (u_int16_t *) skb->data;
- *p++ = htons(4); /* indicate outbound in DLT_LINUX_SLL */
+ p++;
*p = htons(proto);
}
@@ -1491,12 +1491,12 @@
* temporarily remove part of the fake header stuck on
* earlier.
*/
- skb_pull(skb, IPPP_MAX_HEADER - 4);
+ *skb_pull(skb, IPPP_MAX_HEADER - 4) = 1; /* indicate outbound */
{
u_int16_t *p = (u_int16_t *) skb->data;
- *p++ = htons(4); /* indicate outbound in DLT_LINUX_SLL */
+ p++;
*p = htons(proto);
}
pgp8Za1baR4p6.pgp
Description: PGP signature
HTH,
Max
