04-21-2008 10:26 AM - edited 03-03-2019 09:38 PM
how can I ensure that NAT will use the same port when changing the address. At the moment anything using port 7777 incoming is changed to port 2967 when I want it to use 7777?
I've enclosed config + some debug at the bottom of the page.
config deleted
no ip cef
!
!
ip inspect name SDM_LOW cuseeme
ip inspect name SDM_LOW dns
ip inspect name SDM_LOW ftp
ip inspect name SDM_LOW h323
ip inspect name SDM_LOW https
ip inspect name SDM_LOW icmp
ip inspect name SDM_LOW imap
ip inspect name SDM_LOW pop3
ip inspect name SDM_LOW netshow
ip inspect name SDM_LOW rcmd
ip inspect name SDM_LOW realaudio
ip inspect name SDM_LOW rtsp
ip inspect name SDM_LOW esmtp
ip inspect name SDM_LOW sqlnet
ip inspect name SDM_LOW streamworks
ip inspect name SDM_LOW tftp
ip inspect name SDM_LOW tcp
ip inspect name SDM_LOW udp
ip inspect name SDM_LOW vdolive
no ip dhcp use vrf connected
ip dhcp excluded-address 10.0.0.100 10.0.0.150
!
ip dhcp pool IP-xxxx
network 10.0.0.0 255.255.255.0
default-router 10.0.0.1
dns-server 212.139.132.4 212.139.132.21
lease infinite
!
!
ip name-server 212.139.132.4
ip name-server 212.139.132.21
!
!
interface ATM0
no ip address
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0.1 point-to-point
no snmp trap link-status
pvc 0/38
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
!
interface BRI0
no ip address
encapsulation hdlc
shutdown
!
interface FastEthernet0
description $ETH-LAN$$FW_INSIDE$
ip address 10.0.0.1 255.255.255.0
ip access-group 100 in
ip nat inside
ip virtual-reassembly
speed auto
full-duplex
!
interface Dialer0
description $FW_OUTSIDE$
ip address negotiated
ip access-group 101 in
ip inspect SDM_LOW out
ip nat outside
ip virtual-reassembly
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname xxxxx
ppp chap password 0 xxxxx
!
ip route 0.0.0.0 0.0.0.0 Dialer0
!
ip http server
ip http authentication local
ip http secure-server
ip nat inside source list 1 interface Dialer0 overload
ip nat inside source static tcp 10.0.0.111 7777 interface Dialer0 7777
!
access-list 1 remark INSIDE_IF=FastEthernet0
access-list 1 remark SDM_ACL Category=2
access-list 1 permit 10.0.0.0 0.0.0.255
access-list 100 remark auto generated by SDM firewall configuration
access-list 100 remark SDM_ACL Category=1
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 tcp any any eq 7777
access-list 101 permit tcp any any eq 7777 log
access-list 101 permit udp host 212.139.132.21 eq domain any
access-list 101 permit udp host 212.139.132.4 eq domain any
access-list 101 deny ip 10.0.0.0 0.0.0.255 any
access-list 101 permit icmp any any echo-reply
access-list 101 permit icmp any any time-exceeded
access-list 101 permit icmp any any 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 log
dialer-list 1 protocol ip permit
snmp-server community public RO
!
config deleted
Debug Info:
Apr 21 17:39:19.547: TCP: connection attempt to port 7777
Apr 21 17:39:19.547: TCP: sending RST, seq 0, ack 630516979
Apr 21 17:39:19.547: TCP: sent RST to 10.0.0.111:2967 from 81.86.164.235:7777
04-23-2008 02:10 PM
Hi,
The translation is working as designed. The external device "81.86.164.235" is requesting data on port "7777" and the router is translating this request to "10.0.0.111", however, this device has a NAT entry using port "2967". I believe is picking that up from the PAT entry "access-list 1 permit 10.0.0.0 0.0.0.255"
Please post the show ip nat trans | i 10.0.0.111 output from this router.
__
Edison.
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