Hello all,
I've been configuring Cisco devices in a relatively simple fashions for years now. However, we've got a customer who bought a Cisco 1841 with the Firewall Feature set, and there are some new commands and features I'm not used to. Primary I do backbone or distribution layer configs, not ones on the end so the VPN stuff is new to me as well...
Anyhow, this problem here lies in the firewall blocking VPN traffic. Right now, as a lab, I've got the WAN port of the router set up with a xxx.xxx.xxx.158 255.255.255.252 IP address, and the LAN as a xxx.xxx.xxx.161 255.255.255.224 IP address.
When someone from the outside makes a VPN connection to the router's WAN IP address, it grabs an address from the pool, and work fine as long as the firewall is not in place.
Once the firewall is there, the traffic can't make it back in, despite the fact that the inspect CBAC is suppose to open holes in the firewall. I get log entires like:
-- Nameserver not able to get it's traffic back: Jan 11 19:37:45.927: %SEC-6-IPACCESSLOGP: list 101 denied udp xxx.xxx.xxx.10(53) -> xxx.xxx.xxx.182(3758), 1 packet
-- Hitting Yahoo by IP in browser. Traffic not making it back: Jan 11 19:37:55.875: %SEC-6-IPACCESSLOGP: list 101 denied tcp
66.94.230.34(80) -> xxx.xxx.xxx.182(3759), 1 packetNote that the "xxx.xxx.xxx.182" IP is the IP that was handed to the VPN client, but that is ACTUALLY out on the Internet.
I have the feeling that I'm missing something dumb, but I just don't know. I usually feel pretty adept at these things.
For your inspection, here are the relevant portions of the config. Also worth noting is that I've let the Cisco SDM write the access list parts of this. I've also tried it by hand, with no success.
ip inspect name DEFAULT100 cuseeme ip inspect name DEFAULT100 ftp ip inspect name DEFAULT100 h323 ip inspect name DEFAULT100 icmp ip inspect name DEFAULT100 netshow ip inspect name DEFAULT100 rcmd ip inspect name DEFAULT100 realaudio ip inspect name DEFAULT100 rtsp ip inspect name DEFAULT100 esmtp ip inspect name DEFAULT100 sqlnet ip inspect name DEFAULT100 streamworks ip inspect name DEFAULT100 tftp ip inspect name DEFAULT100 tcp ip inspect name DEFAULT100 udp ip inspect name DEFAULT100 vdolive
interface FastEthernet0/0 description $ETH-WAN$$FW_OUTSIDE$ ip address xxx.xxx.xxx.158 255.255.255.252 ip access-group 101 in ip inspect DEFAULT100 out crypto map SDM_CMAP_1
interface FastEthernet0/1 description $ETH-LAN$$FW_INSIDE$ ip address xxx.xxx.xxx.161 255.255.255.224 ip access-group 100 in
ip local pool SDM_POOL_1 xxx.xxx.xxx.176 xxx.xxx.xxx.183
access-list 100 remark auto generated by SDM firewall configuration access-list 100 remark SDM_ACL Category=1 access-list 100 deny ip xxx.xxx.xxx.156 0.0.0.3 any access-list 100 deny ip host 255.255.255.255 any access-list 100 deny ip 127.0.0.0 0.255.255.255 any access-list 100 permit ip any any access-list 101 remark auto generated by SDM firewall configuration access-list 101 remark SDM_ACL Category=1 access-list 101 permit udp host 207.244.144.10 eq domain host xxx.xxx.xxx.158 access-list 101 permit udp host 207.244.153.11 eq domain host xxx.xxx.xxx.158 access-list 101 permit ip xxx.xxx.xxx.176 0.0.0.7 any access-list 101 remark Auto generated by SDM for NTP (123)
72.36.170.170 access-list 101 permit udp host 72.36.170.170 eq ntp host xxx.xxx.xxx.158 eq ntp access-list 101 permit ahp any host xxx.xxx.xxx.158 access-list 101 permit esp any host xxx.xxx.xxx.158 access-list 101 permit udp any host xxx.xxx.xxx.158 eq isakmp access-list 101 permit udp any host xxx.xxx.xxx.158 eq non500-isakmp access-list 101 deny ip xxx.xxx.xxx.160 0.0.0.31 any access-list 101 permit icmp any host xxx.xxx.xxx.158 echo-reply access-list 101 permit icmp any host xxx.xxx.xxx.158 time-exceeded access-list 101 permit icmp any host xxx.xxx.xxx.158 unreachable access-list 101 deny ip 10.0.0.0 0.255.255.255 any access-list 101 deny ip 172.16.0.0 0.15.255.255 any access-list 101 deny ip 192.168.0.0 0.0.255.255 any access-list 101 deny ip 127.0.0.0 0.255.255.255 any access-list 101 deny ip host 255.255.255.255 any access-list 101 deny ip host 0.0.0.0 any access-list 101 deny ip any any logI thank anyone for any input they've got.
Thanks much!
Rick Kunkel