On Wed, Oct 05, 2005 at 10:54:22PM -0500, Matt Domsch wrote: > Progress. To the raw table I added: > -A OUTPUT -p icmp --icmp-type protocol-unreachable --destination PPTP_SERVER -j DROP > > Now what happens is that the LCP Configuration Requests and LCP > Configuration Acks generated by the PPTP_SERVER aren't getting NAT'd > by the firewall coming back to my client, so LCP is never > established. Removing ip_nat_pptp resolves this of course. Enabling debugging in the netfilter pptp and gre modules: ip_conntrack_helper_pptp.c:conntrack_pptp_help: ctinfo = 2, skipping ip_conntrack_helper_pptp.c:conntrack_pptp_help: no full PPTP header, can't track ip_conntrack_helper_pptp.c:conntrack_pptp_help: no full PPTP header, can't track ip_conntrack_helper_pptp.c:pptp_outbound_pkt: outbound control message START_SESSION_REQUEST ip_conntrack_helper_pptp.c:conntrack_pptp_help: sstate: 0->3, cstate: 0->0 ip_conntrack_helper_pptp.c:pptp_inbound_pkt: inbound control message START_SESSION_REPLY ip_conntrack_helper_pptp.c:conntrack_pptp_help: sstate: 3->4, cstate: 0->0 ip_conntrack_helper_pptp.c:conntrack_pptp_help: no full PPTP header, can't track ip_conntrack_helper_pptp.c:pptp_outbound_pkt: outbound control message OUT_CALL_REQUEST ip_conntrack_helper_pptp.c:pptp_outbound_pkt: OUT_CALL_REQUEST: short packet ip_conntrack_helper_pptp.c:pptp_outbound_pkt: OUT_CALL_REQUEST, CID=0 ip_nat_helper_pptp.c:pptp_outbound_pkt: altering call id from 0x0000 to 0xb3a9 ip_conntrack_helper_pptp.c:conntrack_pptp_help: sstate: 4->4, cstate: 0->2 ip_conntrack_helper_pptp.c:pptp_inbound_pkt: inbound control message OUT_CALL_REPLY ip_conntrack_helper_pptp.c:pptp_inbound_pkt: OUT_CALL_REPLY, CID=582F, PCID=B3A9 (so far so good, these were forwarded by the firewall. Then...) ip_nat_helper_pptp.c:pptp_exp_gre: successfully registered expect ip_nat_helper_pptp.c:pptp_exp_gre: successfully registered expect ip_conntrack_proto_gre.c:ip_ct_gre_keymap_add: adding new entry d51597e0: PPTP_SERVER:0x582f -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:ip_ct_gre_keymap_add: adding new entry d5159c80: CLIENT_IP:0x0 -> PPTP_SERVER:0x582f ip_nat_helper_pptp.c:pptp_inbound_pkt: altering peer call id from 0xb3a9 to 0x0000 ip_conntrack_helper_pptp.c:conntrack_pptp_help: sstate: 4->4, cstate: 2->3 ip_conntrack_helper_pptp.c:conntrack_pptp_help: no full PPTP header, can't track (this is OK, this is just a TCP ACK) ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x0 up key for CLIENT_IP:0xe054 -> PPTP_SERVER:0x582f ip_conntrack_proto_gre.c:gre_new: : CLIENT_IP:0x0 -> PPTP_SERVER:0x582f ip_conntrack_helper_pptp.c:pptp_expectfn: increasing timeouts ip_nat_helper_pptp.c:pptp_nat_expected: we are PNS->PAC ip_nat_helper_pptp.c:pptp_nat_expected: trying to unexpect other dir: ip_nat_helper_pptp.c:pptp_nat_expected: tuple c044bda0: 47 PPTP_SERVER:22575 -> FW_PUBLIC_IP:45993 ip_nat_helper_pptp.c:pptp_nat_expected: success ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_new: : PPTP_SERVER:0x582f -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x0 up key for CLIENT_IP:0xe054 -> PPTP_SERVER:0x582f ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x0 up key for CLIENT_IP:0xe054 -> PPTP_SERVER:0x582f ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x0 up key for CLIENT_IP:0xe054 -> PPTP_SERVER:0x582f ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x0 up key for CLIENT_IP:0xe054 -> PPTP_SERVER:0x582f ip_conntrack_proto_gre.c:gre_keymap_lookup: lookup src key 0x2f58 up key for PPTP_SERVER:0xe054 -> FW_PUBLIC_IP:0xb3a9 ip_conntrack_helper_pptp.c:pptp_outbound_pkt: outbound control message CALL_CLEAR_REQUEST ip_nat_helper_pptp.c:pptp_outbound_pkt: altering call id from 0x0000 to 0xb3a9 and now we're dead in the water. Thanks, Matt
