ACL FTP connection problem
I have a problem with the ACL I have FTP transmitted by PAT to an internal server on my border router. I have a pretty extensive ACLs that refuses the spider servers and some beaches I know senders of junk e-mail. The problem in FTP. When the ACL is applied to my external interface (fa0/1) I can not connect via FTP. When I drop the group access, I can connect to FTP a-okay. When the ACL is applied all my other services work as well (http on port 1337, ssh, PPTP, IRC and teamspeak - 9987 UDP). Here is my config. Any help will be highly appreciated:
Building configuration...
Current configuration: 6674 bytes
!
! Last configuration change at 11:07:17 PST Sunday, December 30, 2012, by admin
! NVRAM config last updated at 19:12:53 PST Sunday, December 30, 2012, by admin
!
version 12.4
horodateurs service debug datetime msec
Log service timestamps datetime msec
no password encryption service
!
hostname R1
!
boot-start-marker
boot-end-marker
!
enable secret 5 *.
!
No aaa new-model
clock timezone PST - 8
clock to summer time recurring CDT
no location network-clock-participate 1
No network-clock-participate wic 0
IP cef
!
!
!
!
IP domain name * *.net
IP-server names 4.2.2.2
inspect the IP log drop-pkt
property intellectual auth-proxy max-nodata-& 3
property intellectual admission max-nodata-& 3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
user admin name secret 5 *.
!
!
!
!
!
!
!
interface FastEthernet0/0
Description main switch Port
IP 172.16.0.254 255.255.255.252
IP nat inside
no ip virtual-reassembly
Speed 100
full-duplex
!
interface FastEthernet0/1
Description Internet Port
DHCP IP address
IP access-group WANACL in
NAT outside IP
no ip virtual-reassembly
automatic duplex
automatic speed
!
router ospf 100
Log-adjacency-changes
passive-interface FastEthernet0/1
network 172.16.0.252 0.0.0.3 area 0
default information are created
!
IP forward-Protocol ND
!
!
no ip address of the http server
no ip http secure server
overload of IP nat inside source list 101 interface FastEthernet0/1
IP nat inside source static tcp 10.50.0.250 1723 interface FastEthernet0/1 1723
IP nat inside source static tcp 10.20.0.200 22 interface FastEthernet0/1 22
IP nat inside source static tcp 10.20.0.100 6667 interface FastEthernet0/1 6667
IP nat inside source static tcp 10.20.0.200 80 interface FastEthernet0/1 1337
IP nat inside source static udp 10.20.0.100 9987 interface FastEthernet0/1 9987
IP nat inside source static tcp 10.20.0.250 21 interface FastEthernet0/1 21
IP nat inside source static tcp 10.20.0.250 20 interface FastEthernet0/1 20
!
WANACL extended IP access list
Note * established connections permit *.
allow tcp any a Workbench
Note * Immediate deny forbidden beaches *.
----------------------------------------------------
* Lost prohibited beaches *.
----------------------------------------------------
Note * deny spiders *.
----------------------------------------------
* Ranges of Spider lost *.
-----------------------------------------------
Note * DHCP allow *.
allow udp any any eq bootpc
Note * specific permit ICMP *.
permit any any icmp echo response
Note * deny bogon beaches *.
deny ip 127.0.0.0 0.255.255.255 everything
deny ip 169.254.0.0 0.0.255.255 everything
deny ip 10.0.0.0 0.255.255.255 everything
deny ip 172.16.0.0 0.15.255.255 all
deny ip 192.168.0.0 0.0.255.255 everything
Note * allow all UDP traffic *.
allow a udp
Note * NAT services permit (recorded in SNMP) *.
permit tcp any any eq ftp log
permit tcp any any eq 1723
permit tcp any any newspaper of ftp - data eq
permit tcp any any eq 22 log
permit tcp any any eq 6667 newspaper
allow a gre
allow udp any any eq newspaper 9987
permit tcp any any eq 1337
refuse an entire ip
!
record 10.50.0.250
access-list 101 permit any one
access list 101 ip allow a whole
!
!
!
control plan
!
!
!
!
!
!
!
!
!
!
access controller
Shutdown
!
exec banner ^ C
WARNING: Unauthorized access to this system is prohibited and will be
pursued by the law. By accessing this system, you agree that your
actions can be monitored if you suspect unauthorised use.
^ C
connection of the banner ^ C
*************************************************************
WARNING - PRIVATE - ACCESS FORBIDDEN ELECTRONIC DEVICE
This device is a private network device. Access to this device is
not allowed. Any attempt of unauthorized access will be connected
and appropriate legal action will be taken.
*************************************************************
^ C
!
Line con 0
password 7 *************************************
Synchronous recording
local connection
line to 0
password 7 *************************************
Synchronous recording
local connection
line vty 0 4
password 7 *************************************
Synchronous recording
local connection
length 0
preferred transport ssh
line vty 5 15
password 7 *************************************
Synchronous recording
opening of session
preferred transport ssh
!
NTP-period clock 17180466
NTP 184.105.192.247 Server
!
end
is your server FTP active or passive?
ACL will change you accordingly. try to capture the transaction successful with FTP in wireshark and analyze the source and destination ports.
http://www.SlackSite.com/other/FTP.html
Tags: Cisco Security
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