Cisco :: IOS 12.x+ Port Forward Only Established Connections?
Apr 3, 2013
Using Cisco IOS 12.x+ on a router.How would create an ACL that will only allow access to a port from the inside only after it has been established. i.e. similar to port triggering? Inside host 10.1.1.60 needs to use port 61200 for bit torrent. Dont want the port to be visible as open to the global net accept when the host 10.1.1.60 establishes the connection first.That way a port doesnt have to be left open 24-7.
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Jan 16, 2012
I have one ASA5520 with version 8.4(3), and a few ACL rules defined. One ACL is permit traffic from one interface(EXT_SERVICE) to another interface(DMZ_SERVICE), if i change that rule to deny traffic, all new connections that match the rule is denied, but no the established connectios. ¿Why the established connections can pass the deny rule? ¿How I can change that? I need create a ACL with deny type and stop all comunications that is running and match the deny rule.
Running-config of my ASA5520:
ciscoasa# show run
: Saved
:
ASA Version 8.4(3)
!
hostname ciscoasa
enable password 8ay2wjIyt7RRXU24 encrypted passwd 2wFQnbNIdI.2KYtU encrypted names !
interface GigabitEthernet0/0
[Code] ........
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Jan 23, 2013
I have four ACE 4710. Each pair of ACE is in one geographical location. Probes are configured so that it is checking regular regex (HTTP GET).When there is need rserver update we change text in our testpage.html (for ie. from "OK" to "SUSPEND" ) so that probe detect fail. In fact rservers are still operational, but should not accept new connections. This works fine. BUT I observed that established connection/sessions did not end up after probe fails. ACE probably wait for openned/established connections to end up and it is what I am askign for.What happens if probe fails but in fact rserver is operational? I thought that if probe fails it also end up/cut all established connections to rserver. But seems it is not true.
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Oct 25, 2012
This is actually on my home television network.... Uverse which uses one of those dumb 2wire modem, router, wifi, 4 port 10/100 switch combo devices. it is NOT my internet source. It is just for IPTV services from ATT. Short of replacing the 2wire gateway with a new one from ATT I have a good learning experience question to ask.
I have two switches available at my home to work with on this issue. A EHWIC-8 port Gig Switch in my router and a 24 port 3750E gig switch.
When ever I plug, any port, any cable, both crossover and straight, on the 2wire uverse device into either Cisco switch there are masses of CRC errors generated by the cheapy 2wire thing.
CRC being a layer1 issue in nature I have tried everything short of replacing the 2wire and that is next. There is one caveat.
When the CRC errors are generated and logged on the 3750 it just seems to continue to forward those frames to whereever they need to go regardless albeit a ton of errors.
On the EHWIC 8 port in my 1921 router it seesm to stop forwarding after about 10 secs of encountering CRC errors. What gives? Is there something special command wise that tells a switch to forward frames regardless of CRC errors? Is the 3750 able to deal with them and just forward away and the EHWIC card not able too?
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Mar 2, 2012
I have a Cisco 3745 that is my internet router, I have a domain that directs the web address to the WAN IP address...Can I set up my 3745 to forward incoming connections to my server?
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Feb 25, 2013
We have a Cisco RV042 Router. Two ISP's and using dual wan setup. We are trying to connect to a pc on our network using rdp. The pc we are trying to connect to has been configured to listed for rdp on port 3390. I have tested it internally and connect via rdp thru said port.
I have setup a port forward rule on the router to forward port 3390 to the ip of the pc. I have setup protocol binding for port 3390 service on wan1.
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Nov 7, 2011
I have one server 172.16.0.100 and i nat this server to a public ip X.X.X.5 and i open RDP for this public ip.Now when i access Remote desktop on this public ip x.x.x.5 it open perfectly.Now my senario is that i want to open a http url on port 5555,server ADMIN open port 80 for this URL on LOCAL lan(http://172.16.0.100:80)So how can i map port 5555 to port 80 on ASA 5520.so when i hit URL [URL]
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Nov 18, 2012
Region : Italy
Model : TD-W8968
Hardware Version : V1
Firmwae Version : latest
ISP : telecom italia business on ipatm
How to Forward an external wan port like 49150 to lan ip on port 22?In the control pannel I can set only one port , and this port will be the same where the connection will be router to the lan ip ,therefore If I set the port 22 , the connection will be natted to the 22, but how to set a different external port to a specified different lan ip port?
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Oct 12, 2012
Is it possible to create a service which will forward public port 9010 to an internal IP address with port 23?First of all, I do not like to open the public Telnet port to the inside so I would use another public port and second my ISP does not allow some public ports beneath port 80?
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Sep 18, 2012
I have only recently noticed a HUGE decrease in my Utorrent speeds, so i thought i would have a gander and lo and behold.apparently the port Utorrent uses wasn't open. Now, i have tried about 10 different port numbers, made sure Utorrent is being accepted by Norton 360 Firewall,followed complicated directions to (i think) foward ports, and also follow directions to open a specific port.Nothing has worked so far, Utorrent still comes back with a port closed error.
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Jul 11, 2011
My cisco 837 is connected to a ADSL Router by Ethernet Cable. I have forwarded the telnet port from my ADSL Router to the LAN IP of the Cisco Router so that i can connect to it Remotely but it is not working. I am able to telnet internally but from Internet it is not working. I am not using Cisco Router for ADSL Connectivity.
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Jan 2, 2011
I have just purchased a nas drive. I want to be able to access my files from anywhere. I believe if i setup FTP i can view the files over the web. from what i have been told i need to forward port 21 to the ip address of the nas drive.
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Jul 21, 2011
I purchased a Cisco 851 Router for the reliablity, but the process to manage the router to port forward a IP address for a internet camera ... I'm lost. I will try the forums, versus paying a $400 dollar fee for support.
What is the process to have an internal IP address for my outdoor network camera visiable for WWW? How do I port forward 10.10.10.40 How do I assign a static IP to this outdoor network camera?
I can access the Cisco SDM Express V2.5
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Sep 20, 2011
I always seem to have problems when trying to configure port forwarding on cisco routers. I've even tried the instructions I have for a cisco 1811, but no luck. I have a cisco 871 and a computer that has VNC installed on it. I want to be able to access that computer from out side the network using the external ip address and port 5950. People outside the network will be able to open vnc viewer and type in *external ip address*:5950 and it will be directed to the computer with a static internal ip address of 10.12.0.10. What commands do I use to do this?
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Jan 10, 2011
I can't get any type of port forwarding or DMZ to work with this router. I've checked for double NAT, have a static router IP etc.
I'm using Vista, but I've tried it on a computer with XP as well. I'm using the standard windows firewall, but I also tried disabling it.
I'm using the original 1.10 firmware, I don't know if this is a known issue that was fixed or not.
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Jan 9, 2011
I can't get any type of port forwarding or DMZ to work with this router.
I made sure to check everything in the sticky before I posted and it all checks out.
I'm using Vista, but I've tried it on a computer with XP as well. I'm using the standard windows firewall, but I also tried disabling it.
I'm using the original 1.10 firmware, I don't know if this is a known issue that was fixed or not.
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Sep 25, 2011
On our LAN we have a SBS server and Level Platforms server and soon to be another Ticket Server all hosting an app runnin on 443. OWA, Service Center and Spiceworks Help Desk.
Each has it's own URL:
Remote.domain.com/owa
Sc.domain.com/owa
Support.domain.com
How can I forward Https to these servers? The one company said some Can port forward by URL another guy said you can forward to your internal dns
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Aug 26, 2012
Recently setting up a RV042G for my SOHO. Everything seems to be fine except for SSL port forwarding. I know the router's external static IP is reachable because I test it out with remote management functionality from an external IP. Port forwarding also works correctly because I have other behind the router servers in both UDP and TCP working flawlessly. PPTP VPN also works corrrectly. What I can't get it to run is an Apache server. Looks to me RV042G kind of drop all SSL or HTTP ports from the WAN side.
Configuration:
- 4 port forward rule under "Setup/forwarding" for 80/8080/443 and 8443 all to the webserver with a static IP.
- Firewall page I have Firewall, SPI, DoS enabled.
- Added a firewall rules to allow all HTTP and HTTPS traffic from WAN1 to the webserver static IP.
- Toggle Block WAN Request, HTTPS and multicast does not affect the result.
- Toggle and mapping the remote management port to other port beside 443 does not affect the result.
The same setup will works corretly under my old Netgear FVS router. Am I missing something in RV042G setup?
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Jul 2, 2012
I need to forward traffic from an Amazon server to an internal server with a SQL database on it so need to forward TCP 1433 to an internal IP (192.168.252.43) I have created an access rule to allow the amazon IPP through on 1433 but I am unsure how to point the traffic to the SQL server on the LAN.
I expect I will need to create a NAT rule to do this but cannot see how to achieve it.
I have another problem concerning a site to site VPN which establishes OK but does not pass traffic, I will post that question separately.
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Nov 20, 2012
My internet works. However port forwarding does not work. I want to port forward from the outside to inside obviously. I get an error in my log file which Ill show you and then I will share the running-config I have tried using this method found elsewhere.
========================================================================================================
ATTEMPTED CONFIG
object network inside-host
host 192.168.100.4
nat (inside,outside) static interface service tcp 3389 3389
access-list Outside-2-Inside line 1 extended permit tcp any host 192.168.100.4 eq 3389 log informational interval 300
access-group Outside-2-Inside in interface outside
[code]....
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Jan 19, 2013
I'm trying to do a normal port forward on a ASA 5505 with 9.1(1) and it is not working as it should.There are two ports that I want to forward, TCP 32000 and TCP 32001, from the outside interface.I tried a Auto NAT that gave rpf-check drop. [code]
I have tried diffrent configurations on this for several hours now and I cant get it to work.Could this be asymetric NAT with the dynamic rule? How can I troubleshoot this in a smart way?
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Oct 11, 2011
i´m trying to make a traditional port forward (http to http) on our new asa5510. Previous releases off 5505 and software prior 8.3 was no problem. Could someone tell me how do it in new 8.4 version? I ám a rookie on the new ASA series!
If nothing makes sense in this configuration please give example on how to do it correct. The object on the inside is SRV02 wich is running a webserver on port 80. So i want to open upp for http on outside interface and forward that traffic to srv02 (inside webserver)
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Jan 1, 2012
I consider the NAT mechanism to be quite straight forward, but although the firewall ACLs allow the traffic, it is being denied. The ASDM log and packet-tracer indicate the problem being an ACL.
# the internal resource
object network mabe-mbp
host 10.0.0.36
!
# these are ALL of the rules on the outside/inside interfaces
access-list outside_access_in extended permit tcp host 1.2.3.90 any eq 12380 log disabled
access-list outside_access_out extended permit ip any any log
access-list inside_access_in extended permit ip any any log
access-list inside_access_out extended permit ip any any log (code)
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May 29, 2013
i go to setup/port forwarding and it has every port except port 22 available to forward. what's up with that?
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Aug 17, 2011
I'm trying to set up a security system.How can I port forward an Sagemcon SE-567,and Frontier ISP?
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Jan 21, 2012
I am trying to forward the ports for several ip network cams, that have built in webservers, on this router. I have done this before on my old Linksys router with no problems but the Netgear has me stumped.The only way I can reach any of these devices from the Internet is to map them to port 80. But that limits me to one device, hence the need to forward more ports.All cams have fixed ip addresses so it is not an issue of their ip addresses changing.
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Nov 14, 2011
I have a Thompson TG585v7 router and i have been trying to port forward ports 36666 for my home CCTV system. I created an new application (which i called cctv) which was fine...it was when i tried to assign the new application to the LAN devise iv been having problems.In the 'application' bar i see my application labelled cctv.....then in the device bar i select the 'user defined' option to manually input the devise IP and the router just refreshes and doesn't store the forward that i want
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Apr 23, 2012
Can switch do a port forward without a router just plane switch to port forward to another network crossing the internet.
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Sep 6, 2011
Im trying to port forward a minecraft server. To do this i have to goto to the default Gateway which is 192.168.1.1. i come to an authentication screen that says:The server 192.168.1.1:80 requires a username and password.The server says: NETGEAR WNR2000v2.
NETGEAR WNR2000v2 is the name of my wireless router.Everywhere i go it says the username and password is:
admin, admin
admin, password
admin, 1234
admin, (none)
password, password
password, 1234
password, admin
password, (none)
None of these work i even tried typing the name name and password of my router. No luck?
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Feb 1, 2011
I have been running routers and port forwarding for like the last 8 years and I am absolutely stumped why this router will not do it.I have a host/remote app where the remote accesses the host on port 7777 but it will not work even after adding that in the router admin.I also set the firewall to allow everything to make sure it is not part of the problem.
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Mar 28, 2011
I port forwarded port 80 for wamp. It works on my old **** pc, but not my laptop. They are both connected via ethernet right now, and it doesnt work.
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Aug 22, 2011
[URL]I want to port forward so my family (not in my home) can play Minecraft on my server. What values should I type?
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Feb 24, 2012
When ever I try to port foward It always says the ip adress should be in the same subnet as the lan ip adress when i'm using my public ip adress then I changed my ip adress to the public ip and it worked but no one can't get in the server.
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