Cisco :: Configure 1841 Router And Firewall?
Feb 11, 2013
Configuring Cisco 1841 router and firewall.My provider has put their equipment and given me 2 subnets with public ip address. I am used to getting just one Subnet and connecting my firewall straight to the hand off. But in this case I am a bit confused. I assume I will need to put a router and configure it with before I connect my firewall. [code] I also have a firewall that I would like to be on the subnet 2 at 200.xxx.97.130 and have my private network 192.168.xxx.xxx behind it.
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Dec 24, 2012
setup a vpn server cisco.
device cisco router 1841 [URL]
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Dec 19, 2012
how to configure log in Cisco 1841 router, terminal log
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Apr 2, 2011
how to configure VPN connection with failover on cisco Router 1841?
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May 29, 2013
how can I configure QoS in the router CISCO1841 for the port IPSEC(UDP 500 ,UDP 4500) and the port tcp 4433
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Oct 20, 2012
In my company, we have two Internet connections, one for VPN and the other for emails and browsing. I have Cisco 1841 router with dual ADSL links, and also it's conntected to ASA and the other PIX. through one physical interface (vlan 1and vlan 2). The PIX firewall is connected to users, and the ASA is for VPN only.How can I seperate the traffic is going for emails and browsing and the vpn traffic. I have got to the point, that the router is configured for both ADSL connections, and I also configured the access-list and route-map in the router, the thing is when both ADSL configured together none of them works.
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May 9, 2013
my 1841 router can't resolve dns after enable ios firewall, I try to ping google.com from router's console fail, but dns resolution is fine from lan side.
my partial config---------------------------------
!
ip name-server 8.8.8.8
[Code].....
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Jan 13, 2013
I have checked and re-checked before buying and this card is evidently supported on the 1841 for 'data mode only' which is all I need. I have 3 T1s in Multilink mode and I want to use 2 of these cards (and 3 of the 4 ports) to support it. The problem is that even though SH INVENTORY finds the card, I can't issue the "card type" command to indicate I am using it with a T1 - I get this:
R3(config)#card type t1 1 0
^
% Invalid input detected at '^' marker.
So I tried to issue the "controller T1" command and it does not recognize the slot as containing a T1 card (which makes sense since the "card" command did not work).
I found numerous references to this card being supported in Cisco docs with a minimum OS around 12.2(8) - it varies based on the chassis. I can't find the explicit OS required for the 1841 which is a concern but I am using 12.4(13r)T. SH VERSION finds "2 Channelized T1/PRI ports" which is the MFT card.
I need to get Serial interfaces configured on these cards.
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Aug 4, 2011
As per topology attached herewith, i have 2 ISPs, ISP1 and ISP2. And i have one Cisco 1841 Router with only 2 Ethernet interfaces.My Lan subnet is 192.168.1.0.My puspose is, i want to configure both ISP1 and ISP2 and my Lan Network on router, without adding any extra interaface. I also want to configure a nat so that Lan user can go to internet. I wabt to do this using 2 Interfaces.
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Oct 16, 2011
I configure two WIC-1DSU-T1-v2 interfaces with a T1 crossover cable. What are the mimimum configurations to do to communicate from LAN1 (int fa0/0 of one 1841 router) to LAN2 (int fa0/0 of the second 1841 router) ?
Do I need a routage protocole ? And if yes wich one ? Interne or externe (RIP or BGP) Or static route is enough ? Also, is that I should put a encapsulation, like ppp ? Is it neccessary on a point to point line ?
Finally what about the following commands, do I need it ?
service-module t1 clock source internal
service-module t1 timeslots 1-24 speed 64
service-module t1 framing esf
service-module t1 linecode b8zs
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Sep 11, 2011
I can not access the configure menu.
I try access with Serial cable blue DB09 / RJ45 on console port and serial ports on PC using putty or hyperterminal but any connection can not be done. The screen stay black and not show any text.
The computer found the port COM1 but i csn not access any information from Cisco router model 1841
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May 26, 2013
We have a setup of a firewall in between my Cisco 1841 router and Switch.
Cisco Router --> Meraki Firewall--> Switch
Client VPN is configured on the Meraki Firewall but then for the outside users to client vpn in to the network, I have to port forward or open the ports 500 and 4500 to the IP address of the Meraki Firewall 192.168.1.90. [code]
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Aug 4, 2009
Basically I have an internet router (1841ISR) with 1 internal (LAN) connection and 2 internet connections. What I want to do is route specific traffic for 3 of my internally hosted services (smtp, https, etc) through one internet connection (fa0/0) and then route all other traffic through the unmanaged/dynamic IP ADSL connection (Dialer 0).
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Mar 5, 2012
I have a Cisco 2940 switch and a Cisco 1841 router. I want to build two different VLAN networks on the switch, which do not have to communicate one with each other, but those VLANS should communicate with the router.
I read a lot of articles, i tried to configure properly the switch and the router but i still don't get them work.
I set on the switch, the GigabitEthernet 0/1 port to Trunk port and i had to set it a native VLAN. The problem is that only from that native VLAN, i can ping the router.
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Jun 10, 2011
I configure for our office site to site VPN project. Now I configured already Site to site vpn between ASA 5510 and 1841 router.
HQ LAN
Branch LAN 10.2.1.0/24 >>> ASA 5510>>>>> 1841 >>> INTERNET <<<<<< 1841 <<<<<< 10.30.3.0/24 ^^^^ Call Manager 2851
Now can access from Branch LAN to HQ LAN each other. I face the problems that are
1) In branch LAN , they can access HQ LAN & resource , but cannot access internet. I didn't configure NAT on PH Router
2) Can I access internet from BRANCH LAN through HQ LAN to INTERNET. Or Can I access Internet from Branch LAN from PH Router directly while access to VPN to HQ LAN ?
3) In Branch Site , hard phone cannot work but soft phone on PC can call to HQ. Hard phone IP are same in Remote Network (172.16.1.0/24 ) . Is it problem ? how can I configure separately ?
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Nov 11, 2012
The other day I set up a firewall on my Cisco 1841 router, it all seems to work fine except for a few small problems. 2 wireless devices an iPhone and an Android tablet are having some problems with 1 or 2 apps. iPhone 6.0.1 Facebook app and the App store will not load Android tablet ICS BBC iPlayer and Google play app store wont load or play content. Both devices with their issue were working fine until the new firewall was installed. I’ve tried opening ports and adding ACLs but nothing seems to work. I’ve included my start up config. All other PCs, laptops, smartphones and iPads work fine.
Building configuration...
Current configuration : 5551 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
[code].....
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Jan 3, 2013
I have a cisco 1841 router , and i want to configure zone based firewall on it. But the document of zone based firewall only said that "after 12.4(6)T" can support zone based firewall. I use the ios " c1841-ipbasek9-mz.124-15.T9.bin ", but it can't support ZFW. What kind of ios support ZFW. for example: ipbase, ent base, ip service ,advent etc.
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Feb 13, 2012
What is the best way to deploy the IOS firewall feature?I have a Cisco 1841 router running 12.4.
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Feb 22, 2013
I am researching routers for a large emnterprise application, and their useability as firewalls. Also, is their one that is considered to be better over another?
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Apr 5, 2011
I'm trying to configure my BRI interface in "network protocol-emulate network" and "layer1-emulate network" but i don't have this second command.Is someone have allready to that with this type of interface ?I've to configure this because the ISDN line of my telco is in user mode only.
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Nov 15, 2010
I'm configuring a Cisco 877 router as my firewall.My WAN IP will be assigned dynamically with DHCP. I will also get my default route from DHCP.I will need to configure ip inspection and packet filtering.I will need to configure NAT, I will eventually need to also configure a dial-up VPN.
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Aug 16, 2012
I have Zone Based Firewall running on a 2821 router and would like to configure Url Filtering with Websence . IOS running on that device is c2800nm-adverterprisek9-mz.150-1.M7.bin . Once you have ZBF config you cant configure url-filtering using classic way ( ip inspect ) and this has to be done using class , policy maps .For this to to happen it is required to have match protocol http command under the class map , it wont work using the match access-group command.[code]
Once I put match protocol http command browsing becomes dead slow , also without using match protocol command I cant continue to configure Url Filtering . Is this a problem related to IOS where match protocol command isnt working fine . I have checked CPU utlization of Router and it was roughly near 7 percent .
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Jun 24, 2012
how to configure a router 2900 to support connection from 2 firewall ( Active Standby connections) How can i said the router to send the traffic to the stand by when it go down the active Firewall?I was planning to use a Switch ( layer 2 capacity only) in the middle of the equipments ( between the firewalls and the router) in order to send always the traffic for 1 physical interface from the router side , and manage to route all the internatl traffic to the virtual IP of both Firewalls.Also i dont know yet how to configure a VPN site to site if i have that scheme and some Publics NAT ( Firewall - Switch - Router ), i was planning to configure a NAT in the Router in order to allow the VPN traffic to internal IP of the Firewall but still dont know if it will work.
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Dec 23, 2011
Currently I have an ASA setup as a Firewall with 1 outside interface and 2 inside interfaces. Initially, the Guest interface was setup to receive DHCP from the ASA and everything was working. I'm adding router and a server for the guest interface and what I'm trying to accomplish now is the following: ASA 5505 > Airport Extreme with a public static IP (69.xx.xx.6), handling DHCP and NAT > Mac Server as DNS Server.Right now, when I connect to my Airport Extreme with any computer, I don't have internet. I don't understand what's wrong. My DNS Server has a reserved IP address: 192.168.226.2 and it's pointing to itself and forwarding the ISP DNS servers, the Airport Extreme is handling the DNS Server IP and the ISP DNS Server IP but I can't connect to the internet from the server. [code]
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Dec 29, 2012
I have one Cisco ASA 5510 with 2611 router two 2960 switch how to configure.
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Aug 19, 2011
I am new to firewalls and I am trying to make mine block specific websites but so far have had no success. Here are the settings I am using in the router's admin area:
Security > Firewall > General
Active firewall
Security > Firewall > Rules
[Code].....
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Apr 2, 2012
I have a Cisco 1841 serving as a connection between my ISP and my Firewall (non Cisco).
I seem to be having performance issues with my traffic going through the Router.HTTP (web browsing) is fine andI get my download rate as I would expect for a 10mbps connection.But anything to do with my VPNs I find a delay when sending via the 1841.(all my VPNs are managed by my Firewall and I have never had problems with those).
I also have a legacy ADSL connection to my firewall, which bypasses the 1841 and I am having no issues on that at all.If anything it is quicker! Which is madness as my Fibre should out-perform it easily.This leads me to believe the issue is not with the Firewall.
My 1841 is very simply setup, 2 fa interfaces with simply a default gateway setup within it.Which leads me to ask if I need more static routes in or a dynamic route protocol setup?
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Feb 27, 2012
I am trying to figure out how to use a Cisco 1841 IOS router to take traffic from one interface and source NAT it out towards the Internet on one interface and at the same time NOT perform NAT when sending the traffic towards a different routed interface.
Here the RemoteSite has connectivity back to the MainCampus, but there is no need to NAT traffic from the one site to the other. They share the same umbrella of address space. However, the RemoteSite needs to have its Internet-bound traffic NAT'ed out to the Public Internet via a third interface. I know that I could just NAT everything out from the Remote Site and map the traffic back onto the same address space for intra-campus communication, but I'd rather avoid that and just NAT where I need to NAT it to the Internet.
I do have a caveat here: in the event that either the MainCampus or the Public Internet interfaces go down, I would like to failover traffic from the downed link to other good link. For example, I want to NAT all traffic (including "intra-campus" traffic) out via the Public Internet if the direct link to the MainCampus is down. For the other example, if the Public Internet direct link is down, I would just send out all traffic without NAT towards the MainCampus.
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Apr 6, 2011
I have configured a Cisco router. I am able to ping google from rotuer. I can ping my local IP from router and router local IP to my machine. But I can not access internet on machine. I can not ping google and any other IP out of network.
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Nov 27, 2011
I have a Cisco 1841 router with an HWIC-ADSL module installed. My ADSL connection is PPPoA with a dialer interface and I have been provided 6 ip's from my provider to use on this service. Previously I have connected Fa0/0 on the 1841 straight onto my network and used NAT and ACL's on the 1841, I would now like to change this and have Fa0/0 connected to a Palo Alto firewall and use the Palo Alto to provide NAT, Firewall & site to site VPN functions. What config would I require on the 1841 to allow me to use one of my ISP IP addresses on the Palo Alto to allow it to be a VPN endpoint? Do I need to configure the 1841 in bridge mode?
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Apr 21, 2013
I am trying to figure out how this works. I have an ISP device that connects to my 1841. ISP and fa0/0 hold the /30 WAN addresses. Fa0/1 hold one of the public IPs, lets say 1.1.1.1/29. Then the outside interface of the ASA holds 1.1.1.2/29. Now I have two routes in the 1841, one for default route going back to the ISP device, and a route for the 1.1.1.0/29 network going to the ASA.Now I have 4 more publics I can use 1.1.1.3 - 6. I do not want to assign these IPs to the servers, but yet just NAT them. I know this is possible, but cant figureI took an internal host and did a one to one static NAT from private to public. Packet tracer says my NAT rules are ok. Allowed all IP traffic for testing and still can't ping the server.
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Jul 15, 2011
I am going to design one network. I had queries with this design.Let me explain scenario first( it was attached below).I have two sites, Site-A and Site-B, repectively.
In site-A i have one Cisco 1841 router, one Cisco ASA 5510 firewall and One cisco 3560 layer 3 switch.
in site-B i have one Cisco 1841 router, one Cisco ASA 5505 firewall and One Cisco 3560 layer 3 switch.
From ISP side
I have point-to-point leased line between sites A and B. And both sites have internet connectivity from another ISP.
I planned to terminate leased line in cisco 1841 router in both branches for branch to branch connectivity.
I will configure site to site VPN between two sites, A and B.
Here my query was i want make VPN as failover connectivity if leased line fails. In both the cases, i need internet to the inside users in both sides.
Summary requirement:Leased line is Primary and VPN is Back-up, if leased line fails. In both cases internet is needed to inside users.
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Mar 20, 2012
I am in a situation where I share internet access with roommates. We have a Gateway which is conected to the provider and which delivers ethernet and WiFi signal.
In order to isolate myself from my roomates and to protect my network connection, both wired and WiFi, I would like to plug in the Ethernet cable I get from the Gateway to my router, and then configure my router's firewall and WiFi enctryption to maximize my safety.
However, I am having some problems. I have already configured the router as "router" and not "Gateway" and I am trying to assign it an IP address different from the default one, which is the one the gateway has, and a ranger of DHCP IP's, also different from those of the Gateway. In other words, 192.1681.N.1 for the router and start from there.
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