pix vpn, client connecting, but nothing pingable

[mrkamel]

Hi guys,

i have installed a pptp vpn on my pix using the pdm,
i'm able to connect to it, but no other
machine is pingable or reachable

i don't know much about vpns an the pix in general,
but i hope you'll have an answer

here's my config

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password Oewbi1sjMElvcaFZ encrypted
passwd ******* encrypted
hostname pixfirewall
domain-name ciscopix.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list inside_outbound_nat0_acl permit ip any 172.16.0.0 255.255.255.0
access-list inside_outbound_nat0_acl permit ip 172.16.0.0 255.255.255.0 172.16.0.0 255.255.255.0
access-list outside_cryptomap_dyn_60 permit ip any 172.16.0.0 255.255.255.0
access-list outside_cryptomap_dyn_80 permit ip any 172.16.0.0 255.255.255.0
access-list outside_cryptomap_dyn_100 permit ip any 172.16.0.0 255.255.255.0
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 207.19.54.233 255.255.255.0
ip address inside 172.16.0.2 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool plainpicture 172.16.0.55-172.16.0.255
pdm location 192.168.1.2 255.255.255.255 inside
pdm location 192.168.1.0 255.255.255.0 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 172.16.0.0 255.255.255.0 0 0
nat (inside) 1 192.168.1.0 255.255.255.0 0 0
nat (inside) 0 0.0.0.0 0.0.0.0 0 0
route outside 0.0.0.0 0.0.0.0 217.110.23.113 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http 192.168.1.2 255.255.255.255 inside
http 192.168.1.0 255.255.255.0 inside
http 172.16.0.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 40 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 60 match address outside_cryptomap_dyn_60
crypto dynamic-map outside_dyn_map 60 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 80 match address outside_cryptomap_dyn_80
crypto dynamic-map outside_dyn_map 80 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 100 match address outside_cryptomap_dyn_100
crypto dynamic-map outside_dyn_map 100 set transform-set ESP-3DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map client authentication LOCAL
crypto map outside_map interface outside
isakmp enable outside
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
isakmp policy 40 authentication rsa-sig
isakmp policy 40 encryption 3des
isakmp policy 40 hash md5
isakmp policy 40 group 2
isakmp policy 40 lifetime 86400
vpngroup ASPLAIN dns-server 212.121.128.10 212.121.128.11
vpngroup ASPLAIN idle-time 1800
vpngroup ASPLAIN password ********
vpngroup asplain address-pool plainpicture
vpngroup asplain dns-server 212.121.128.10 212.121.128.11
vpngroup asplain idle-time 1800
vpngroup asplain password ********
vpngroup plainvpn address-pool plainpicture
vpngroup plainvpn dns-server 212.121.128.10
vpngroup plainvpn idle-time 1800
vpngroup plainvpn password ********
telnet timeout 5
ssh timeout 5
console timeout 0
vpdn group PPTP-VPDN-GROUP accept dialin pptp
vpdn group PPTP-VPDN-GROUP ppp authentication mschap
vpdn group PPTP-VPDN-GROUP ppp encryption mppe auto
vpdn group PPTP-VPDN-GROUP client configuration address local plainpicture
vpdn group PPTP-VPDN-GROUP pptp echo 60
vpdn group PPTP-VPDN-GROUP client authentication local
vpdn username xyz password *********
vpdn username abc password *********
vpdn enable outside
vpdn enable inside
terminal width 80

 

[horus42]

It looks like your DHCP pool for the VPN users seems to be part of the inside segment, why don’t you just create a dedicated pool for the VPN users


Hope that helps

 

[TamerAhmed]

Sometimes i see the same problem (symptom) but using IPSec even with a dedicated pool for my VPN clients , sometimes i connect and take an IP address but i can not ping any thing

 

[horus42]

After you establish a connection please check your routing table of your computer and check if route has been injected correctly, if that looks OK, I would run continuous ping and then turn on "deb icmp trace" to see if my traffic is actually reaching the firewall, if you can see the echo packets reaching your firewall, enable logging and see what messages you get.


Hope that helps

 

[TamerAhmed]

Sir,
i have done what you recommended but the PIX doesn't log any activities from vpn client whether if i could successfully ping my target or not ( i.e in the case of reachable target , i can not evn see my actvity on my PIX although i have enabled loging on level 7!!!). I'm not sure if that nrmal according to the command sysopt connection permit-ipsec that let's th PIX bypass the IPSEC traffic from being filtered from its access-list or it has nothing to do with that!!!

waiting for your reply

P.S: sometimes i may doubt if my connection itself hangs so it may be a reason of that symptom i described before,but as a simple test i ping yahoo.com to check, and find the same results

 

[TamerAhmed]

Hello,

Any updates please regarding this case?

Today i have found that every thing is O.K and all routes exist in my routing table after connecting successfully but nothing is pingable..even after many resets..but in vain

 

[br0ck]

has your config changed since the first post?

please post a current config and i help you with it

please follow secure config posting
faq35-3239

 

[TamerAhmed]

Here is my config, putting into your account that my VPN i complain from is with vpn name "admin". I also enabled VPDN(PPTP) as a backup solution if i have problems from IPsec VPN

Note: also i have aborted some configurations like my access-list, naming, static nating that won't add any kindl of help here. Thanks in advance

PIX Version 6.3(4)
interface ethernet0 100full
interface ethernet1 100full
interface ethernet2 100full
interface ethernet3 auto
interface ethernet4 100full
interface ethernet5 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 staff security10
nameif ethernet3 backend security20
nameif ethernet4 failover security5
nameif ethernet5 TEST-ADMIN security10
hostname Admin-PIX
clock timezone EGY 2
clock summer-time EGY recurring last Fri Apr 0:00 last Fri Sep 0:00
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol icmp error
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol rtsp 8554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names config
aborted


access-list 101 permit ip 10.0.48.0 255.255.255.0 172.21.201.0 255.255.255.0
access-list 101 permit ip 10.0.16.0 255.255.248.0 172.21.201.0 255.255.255.0
access-list 101 permit ip 10.0.8.0 255.255.248.0 172.21.201.0 255.255.255.0
access-list 101 permit ip 10.0.40.0 255.255.255.192 172.21.201.0 255.255.255.0
access-list 101 permit ip host 81.29.96.137 172.21.201.0 255.255.255.0
pager lines 24
logging on
logging timestamp
logging trap warnings
icmp permit host 81.29.96.130 outside
icmp permit 10.0.16.0 255.255.248.0 staff
icmp permit 172.21.200.0 255.255.255.240 staff
icmp permit 10.0.49.0 255.255.255.0 staff
icmp permit 10.0.16.0 255.255.248.0 backend
icmp permit 10.0.49.0 255.255.255.0 backend
icmp permit 10.0.0.0 255.255.255.0 TEST-ADMIN
mtu outside 1500
mtu inside 1500
mtu staff 1500
mtu backend 1500
mtu failover 1500
mtu TEST-ADMIN 1500
ip address outside 81.29.96.137 255.255.255.192
ip address inside 10.0.48.1 255.255.255.0
ip address staff 10.0.49.1 255.255.255.0
ip address backend 10.0.16.3 255.255.248.0
ip address failover 10.0.200.165 255.255.255.252
ip address TEST-ADMIN 10.0.0.2 255.255.255.252
ip verify reverse-path interface outside
ip verify reverse-path interface inside
ip verify reverse-path interface backend
ip audit info action alarm
ip audit attack action alarm
ip local pool vpn-client 172.21.200.1-172.21.200.14
ip local pool Admin-Pool 172.21.201.1-172.21.201.254 mask 255.255.255.0
ip local pool test-pool 172.21.202.1-172.21.202.254 mask 255.255.255.0
no failover
failover timeout 0:00:00
failover poll 15
no failover ip address outside
no failover ip address inside
no failover ip address staff
no failover ip address backend
no failover ip address failover
no failover ip address TEST-ADMIN

arp timeout 14400
nat (inside) 0 access-list 101
nat (backend) 0 access-list 101

access-group acl-out in interface outside
access-group acl-staff in interface staff
access-group acl-backend in interface backend
established udp 177 0 permitto tcp 6000 permitfrom tcp 0
route outside 0.0.0.0 0.0.0.0 81.29.96.130 1
route TEST-ADMIN 10.0.1.0 255.255.255.0 10.0.0.1 1
route backend 10.0.8.0 255.255.248.0 10.0.16.101 1
route backend 10.0.40.0 255.255.255.192 10.0.16.101 1
route backend 172.21.1.108 255.255.255.252 10.0.16.101 1
route backend 172.21.1.132 255.255.255.252 10.0.16.101 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server TACACS+ (backend) host 10.0.16.103 notackeyor timeout 10
aaa-server TACACS+ (inside) host 10.0.16.31 timeout 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
aaa authentication telnet console LOCAL
aaa authentication ssh console LOCAL
aaa authentication enable console LOCAL
aaa authorization command LOCAL
ntp server 10.0.16.31 source backend
http server enable
http 10.0.48.0 255.255.255.0 inside
snmp-server host backend ECC-Tevoli-in
snmp-server host inside 10.0.48.199
no snmp-server location
snmp-server contact Admin_PIX
snmp-server community xeccpublicy
snmp-server enable traps
tftp-server backend 10.0.16.103 .
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
crypto ipsec transform-set ADMIN esp-des
crypto ipsec transform-set myset esp-aes-256 esp-sha-hmac
crypto dynamic-map dynmap 10 set transform-set myset
crypto map mymap 10 ipsec-isakmp dynamic dynmap
crypto map mymap interface outside
crypto map NEW 20 ipsec-isakmp
crypto map NEW 20 match address 101
crypto map NEW 20 set peer 10.0.0.1
crypto map NEW 20 set transform-set ADMIN
crypto map NEW interface TEST-ADMIN
isakmp enable outside
isakmp enable TEST-ADMIN
isakmp key ******** address 10.0.0.1 netmask 255.255.255.252
isakmp identity address
isakmp nat-traversal 20
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption aes-256
isakmp policy 10 hash sha
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption des
isakmp policy 20 hash sha
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
vpngroup vpn3000 address-pool vpn-client
vpngroup vpn3000 dns-server 10.0.16.32
vpngroup vpn3000 split-tunnel 102
vpngroup vpn3000 idle-time 1800
vpngroup vpn3000 password ********
vpngroup admin address-pool Admin-Pool
vpngroup admin dns-server 10.0.16.32
vpngroup admin split-tunnel 101
vpngroup admin idle-time 3600
vpngroup admin password ********
vpngroup admin1 idle-time 1800
telnet timeout 10
ssh 172.21.201.0 255.255.255.0 outside
ssh 10.0.48.0 255.255.255.0 inside
ssh 10.0.8.0 255.255.248.0 backend
ssh 10.0.16.0 255.255.248.0 backend
ssh timeout 10
console timeout 0
vpdn group 1 accept dialin pptp
vpdn group 1 ppp authentication pap
vpdn group 1 ppp authentication chap
vpdn group 1 ppp authentication mschap
vpdn group 1 ppp encryption mppe auto
vpdn group 1 client configuration address local Admin-Pool
vpdn group 1 client configuration dns 10.0.16.32
vpdn group 1 pptp echo 60
vpdn group 1 client authentication local
vpdn username xxxxxxxxxxxx password *********
vpdn enable outside
terminal width 80
Cryptochecksum:20ee600e4620272501db67be82c5b292
: end