Cisco WAN :: 1811 - Restricting SMTP Inbound Traffic
Mar 16, 2012
I use a mail filtering service that delivers mail to me via SMTP on standard port 25 on one of my 5 static external IP's. I wish to restrict this to their IP's only (they have two) and I am unsure on how to do so? As it stands now, anything on the net can talk to my mailserver and my logs are filling quickly with failed attempts as a result. Here's my setup and what I am trying to accomplish:
mail filtering service -> my public ip:25 -> internal mailserver at 10.0.10.2:25, deny everything inbound except traffic from the mail filtering service, I am thinking an ACL would fit the bill here, but unsure of how to implement. Router is an 1811 with version 15.1(4)M3 IOS. WAN is on fa0, lan is on fa1.
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Dec 29, 2011
I am trying to configure my ASA5505 to allow SMTP relay and the ACLStatic I created is not working.
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Jan 10, 2011
I am deploying a Cisco 1841 in place of our basic DSL router.I have an ADSL WIC and FA0/0 connected to our LAN.LAN IP ADDRESS range is 192.168.1. 0/ 24 I have dynamic and static NAT configured. At this point although I have ACL's configured I have NOT implemented them as yet for the following reason. I am unable to recieve inbound SMTP traffic - now know my MX records are correct as this all owrks happily on our basic DSL router. I can send external emails no problem and all internal email works fine. [code] I am in the process of defaulting the router and programming the barbones to get the link working and see if inbound SMTP works then start building the blocks again.
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Mar 19, 2013
We have a Cisco 2811 running ITP IOS. On that router we run the SMPP service. A client on the network connects to this service, and we need to capture the traffic for debug.
I've tried traffic-export, but I cannot see any outbound traffic.I'm guessing that this is due to the fact that the outbound SMPP traffic is not transit traffic as it is generated by the router itself.
Is there any way to capture the outbound traffic?
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Jul 18, 2011
i have to restrict that router and switches shall join only given multicasts. Means if i change multicast in TVG430 from 239.0.96.1 to 233.0.96.1 than it shall be blocked.My TX rate i set to 20 Mbits on TVG430, i want to rate-limit it to 15 Mbits on switch on Ingress int gi 0/23 or egress gi 0/24 included are three show runs output.ip multicast rate-limit out group-list GROUP source-list SOURCE.
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Dec 6, 2012
I have two ISP, I want to divide Inbound to ISP1 and Outbound to ISP2.
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Dec 25, 2012
Most examples of NAT translation using an ASA 8.4 are based on servers within a DMZ. In my case it's not because the mailserver also functions as an data and Active Directory server for my local domain. If tried to config the ASA for a while now and throw it in the corner for a couple of months out of frustration. Now I got some time left during christmas break I decided to start again.My purpose is to NAT SMTP / POP traffic from the internet, trough the ASA to my (inside) server. This is what I got so far. With this config I'm unable to telnet the inside server (192.168.1.10) from a remote location.
ASA Version 8.4(3)!hostname ciscoasaenable password cE8UUNd encryptedpasswd 2KFQ.2KYOU encryptednames!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address 192.168.1.253 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 95.*.*.218 255.255.255.248!ftp mode passiveobject network obj_anysubnet 0.0.0.0 0.0.0.0object network server1_smtphost 192.168.1.10object network server1_pop3host 192.168.1.10access-list outside_access_in extended
[code]....
I can ping 192.168.1.10 from the ASA CLI. I can Ping DNS 4.2.2.2 from the CLI (internet access). I can Telnet the server from the inside LAN, using: telnet 192.168.1.10 25.But I can't Telnet from an outside location using: Telnet 95.*.*.218 25 Because my server is on the Inside interface (diffenrent subnet) do I need an additional route?
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Sep 17, 2012
I have a remote office with a 1.54mb circuit connected to our private MPLS network. Our main office has a 20mb conneciton to said network. I want to set a QoS policy for traffic from the remote office to our Avaya subnet within the main office. This policy is to give priority to all traffic to the Avaya G350.
I have set up the outbound traffic policy on our remote office router using a policy map as follows:
access-list 101 permit ip any 192.168.0.0 0.0.255.255 (this represents the Avaya subnet)
class-map match-all voice_outbound
match access-group 101
policy-map voip_outbound
class voice_outbound
priority percent 50
interface Serial0/3/0
service-policy output voip_outbound
This works fine for outbound traffic. Now how do I give priority to inbound traffic from the 192.168.0.0 network? When I try to do similar command it says CBWFQ is only configurable as output, not input.
I'd just limit it at the far end, but that has a 20mb pipe. All other traffic from our corporate datacenter, as well as internet traffic, flows from the main office to the remote office. Should I just rate limit everything else destined for the remote office subnet, and if so, what's the best method?
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Mar 6, 2013
I'm new to ASA's and PIX units. I've setup a few VPN's now but know next to nothing about logging on these units. I read the config guide for the PIX, but cannot figure out how to get a log of incoming SMTP traffic going on the console.Do I need to use a SYSLOG server? I can probably set one up on my laptop.
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Oct 27, 2012
I am running CBAC on a 1811 running IOS 15.1 and can't figure out how to configure it so that I can preform TFTP upgrades with CBAC enabled. It appears that CBAC doesn't catch self-generated traffic and put in a reverse rule in the ACL. I am trying to upgrade the image on this router using a public-addressed TFTP server on the F0 interface. If I drop the ACL the traffic will work, so why isn't CBAC cacthing the TFTP outbound? [code]
The tftp rule above is for TFTP upgrades on other equipment, using a server behind this router. I tried defining an outbound ACL as well on F0 to get the traffic be "caught" by CBAC but that didn't work. I also tried adding "ip inspect name trust tftp" but that didn't work.
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Jan 17, 2013
I have two Cisco 7606 routers using BGP to connect our customers to the internet. Recently we added a new 1G circuit in addition to an existing 1G circuit and all traffic inbound is now on this new 1G circuit. We would like to shift some of the inbound traffic over to the other 7606. Our Tier provider has the same AS number for both paths. One path goes directly to New York and the other goes to Boston then New York.
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May 28, 2013
CE IP - 172.18.10.10 /30PE IP - 172.18.10.9/30 I had configured some floating static route on the PE towards CE .The routes were installed correctly till PE - CE link was UP as next hop IP was showing as connected .Now the link has been removed and I am receiving a supernet of 172.16.0.0/12 from PE2 via MPBGP. Although the 1st static route for 10.10.0.0 is showing in routing table, the other 2 ( 172.17.0.0 & 172.24.0.0 ) donot show. I believe that as both the routes and next hop fall under the supernet , the static route is not installing. But I don't know why is this behaviour. I tried to remove the distance 250 from both the routes , but still the static route does not install. I tried this on GNS3 but got the same results .
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Apr 6, 2013
I have a working L2L between two locations. Location A and Location B.
Location A: 172.16.16.0/24
Location B: 192.168.0.0/24
I would like to block anything inbound to Location A from Location B that isn't initiated from Location A. The block should be done on the ASA5505 at Location A. Location B uses an ISR G2 router. i.e. Location A can start an SSH session to a server in Location B Location B cannot start an SSH session to a server in Location. .
I tried using a VPN filter on the ASA5505 but it isn't stateful, I cannot pass any traffic when using it.
Config on my ASA:
access-list vpn-traffic extended permit ip 172.16.16.0 255.255.255.0 192.168.0.0 255.255.255.0
access-list block-vpn-to-local extended deny ip 192.168.0.0 255.255.255.0 172.16.16.0
[Code]....
I also have an AnyConnect VPN setup for the ASA5505 and it is running 8.2(5).
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Dec 25, 2012
We have a L2L VPN with a vendor and our outbound traffic (our local network is 192.168.0.0) NATs over one of our public IP addresses x.x.x.164 to their public IP address 128.x.x.x. In the beginning all our traffic was outbound (port 23) to the vendor and now we need to allow inbound from the vendor to specific 192.168 addresses on our network using port 9100. I’m uncertain as to what I should do to allow their inbound traffic to these IP addresses since we are NATing our entire network over one IP address. Note, the .164 public IP is also used to NAT to other vendors we have L2L VPN with. The VPN terminates to our ASA 5580 version 8.2.
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Nov 7, 2012
I have an ASA5510 with 8.3 and a Cisco PIX525 (retiring). The ASA was for VPN traffic only while the PIX was for all other Internet traffic. I'm trying to move all the traffic to the ASA5510 so I used the PIX to ASA migration tool. I migrated the PIX rules over to the ASA5510, however we can't receive email and there is no external access to our internal websites. But the VPN connections remain intact and internal users can get out to the internet.
When I run Packet Tracer on my outside (incoming rules) the packets are dropped at the inside interface. What am I missing?
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Oct 9, 2012
We want design a topology based on transparent proxies using WCCP. Our proxies can do spoofing of user ip addresses. So, the HTTP request will go out our network with the user ip address as source ip. The HTTP Response will arrive with destination address the user ip address. We want use WCCP to redirect inbound and outbound traffic because we have c3750 with L2 WCCP support. The outbound redirection, when the packet is going out our network is simple. But, the problem is the inbound redirection. How we redirect this packets to proxies by WCCP?. Is it possible?. This redirection is done by c3750 using TCAMs/hardware?. Our throughput could grow until 2-3Gbps and we are worried about the performance.
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Aug 21, 2011
A recently added outbound rule has left my SMTP communications broken. I have since removed the rule, and had Cisco do some damage control, but it's still dropping some of the SMTP traffic. I get a number of NDR messages each day like the one below:Your message did not reach some or all of the intended recipients. Subject: RE: Christopher, Curt Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached:
[URL]
on 8/21/2011 9:49 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<630.SM.Local #4.4.7>
Your message did not reach some or all of the intended recipients. Subject: RE: Christopher Curd Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached: JWillar@email.com on 8/21/2011 9:49 AM Could not deliver the message in the time limit specified. Please retry or contact your administrator. <630.SM.Local #4.4.7>
I've attached an image of my configuration (ASDM GUI). The part of the image highlighted in green are the SMTP rules. The part highlighted in yellow is another rule that I added about a month ago to block a SYN attack. This rule may be part of the problem because of the order it is in the list. Not sure, though.
I have had two Cisco techs Putty into my ASA to check things out. I think they've done all they can. I wonder at this point if it be wise to just reload the last good running-config I have prior to the Outbound rule being added.
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Dec 2, 2012
We have a customer using a 2911 router with 3 x DSL WAN links.
The customer runs a building with shared office space which people rent.
Customers in the building are experiencing a problem where they cant email other tenants i.e...
One tenants exchange server tries to make a connection to another tenants server by going out to the internet and back in via the same interface.I believe this might be called "Hair Pinning"
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Jul 8, 2012
Up until recently one of my sites was able to get to a postilion subnet. Then we started receiving "host unreachable" e-mails. Posting told us SMTP traffic was not getting let in. I've compared the current config to a config that was saved before the issue popped up and found really no noticeable difference.
I tried a packet tracer trace with no luck: SiteB- Firewall# packet-tracer input outside tcp 11.2.2.36 12345 65.19.0.0 25.
Phase: 1
Type: FLOW-LOOKUP
Subtype:
Result: ALLOW
Config:
Additional Information:
Found no matching flow, creating a new flow
[code]...
Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: outside
output-status: up
output-line-status: up
Action: drop
Drop-reason: (acl-drop) Flow is denied by configured rule
Attached is a sanitized config. I'm not entirely convinced it's a firewall issue, but I need to some successful testing to prove otherwise.
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Oct 5, 2011
How to configure the 825 to block inbound traffic from a specific internet IP address ?i noticed an IP and MAC that i don't recognize that is listed as a connection to my NAS's media server ...i blocked it in the NAS configuration page, but i don't want any unsolicited traffic into my network.
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Apr 5, 2013
I have a RV110W that's been in service since Dec 2012. All Everything is working fine except every month or so the firewall starts blocking all inbound traffic. It does not respond to remote management access. If I reboot the firewall (pwr off/on) everything works correctly for the next month or so and then it begins blocking all inbound traffic again. Local access to the Internet and VPN tunneling are not affected. When it's working, all my rules and port forwarding work correctly.
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Nov 3, 2011
I have a client that has an ASA 5520 that has two internet connections, FIOS and Comcast. The ASA is configured to failover from the FIOS to the Comcast if the FIOS fails. This works perfectly fine. However, I was wondering if VPN and other inbound traffic will come into the secondary connection when it is active. I think VPN will work inbound when the FIOS connection fails, but I am not sure about the other inbound connections.
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Nov 1, 2012
I have a VPN on my ASA 5510 between (A)192.168.255.0/24 and (B)172.20.2.0./24. The purpose of the tunnel is to send kerberos tickets from our domian controller on the A side, across to a server at B, and receive a respose. I want to lock down inbound traffic to the A network, but not sure of best method.
I initially tried using an ACL filtering on ports, but soon realised the incoming traffic uses a wide range of ports so this is not really possible.Seeing as the A side will always be initiating the conversation, I was wondering if I could use the 'established' option on the inbound ACL for the ASA at A side, so that it would block any flows that are not initiated by the A side.
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Aug 7, 2011
We are using several Cisco ASA 5505 with the 8.05 OS on it. The problem is that the SMTP traffic of my ISP(Telenet) isn't passtrough the ASA, I'm using outlook 2010. Before there was also a problem with our local exchange server but I solved this by disabling ESMTP checking in the policies, but it didn't worked for my local ISP.
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Nov 26, 2011
I am new to the ASA series and I am at a complete loss as to why I cannot configure this router to forward SMTP and RDP traffic to an internal host.
The packet trace tool in ASDM shows complete end-to-end connectivity for RDP but it still fails to connect from outside. This is my config file, what I need to change in order to make it work?
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Dec 25, 2012
I have been trying to figure out a NAT issue on my 2811 and the inspect engine.I have 'ip inspect FW out' on my outside interface. If I turn it off, I also have to remove the access-list applying to inbound traffic on that same interface. Why is that? This whole thing centered around SIP registrations from devices on my LAN to my provider. The provieder is showing that I am registering from a high end port (1024 or something crazy). He said that it sounds like some type of SIP ALG or something on my router. For the life of me, I can't figure out what would be causing it. I am just using a standard route-map that points to the outside interface using 'overload'.
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Jun 22, 2012
I have two 1800 routers running VRRP. Also I have two sub interface configured on both router and both router connected to swith through thunk link. My goal is to limit inbound traffic to 3Mbps for both VLANs on router's inside interface which is connected to switch.
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Mar 2, 2012
We are using Cisco 3750 switches in our environment as distribution switches.We currently use to police inbound traffic, but we need to find a solution to limit inbound traffic per IP.Something like this “Inbound traffic for each IP can be maximum 1 Mbps” This can be done having, one ACL and one class-map for each IP, but in my situation is not a practical solution, because we have more than 500 IP’s on that site.
Is any way to accomplish this without writing 500 ACLs and 500 class-map?
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Jun 11, 2012
We have configured ASA 5510. We have configure Ethernet 0/0 ( Outside ) connected with ADSL line and Ethernet 0/1 ( Inside ) Local LAN. we have configured NAT and all the traffic is passing through outside interface. Now we have connected ethernet 0/3 ( leasedline ) interface with static public IP. Now we want to allow SMTP traffic to pass through from this interface.
How to configure it if we want our local lan SMTP traffic sending through new leased line ( Static Public IP ).
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Feb 12, 2010
BEFSX41 V2.1
Firmware: 1.52.16
The manual states how to create an inbound traffic policy but if you follow the directions there is no place to select inbound traffic.From the manual: To Create an Inbound Traffic Policy1. Enter a Policy Name in the field provided. SelectInbound Traffic as the Policy Type.2. Enter the IP Address from which you want to block.Select the Protocol: TCP, UDP, or Both. Enter the portnumber or select Any. Enter the IP Address to whichyou want to block.3. Select Deny or Allow as appropriate.4. By selecting the appropriate setting next to Days andTime, choose when the Inbound Traffic will be filtered.5. Lastly, click the Save Settings button to activate thepolicy.When finished making your changes on this tab, click theSave Settings button to save these changes, or click theCancel Changes button to undo your changes.I want to filter out a range of ip addresses from trying to connect to my network.
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Oct 23, 2012
I am trying to block outbound and inbound traffic on TCP 5222 and 5223 on E2500 but cannot figure out how. The reason is I have kids in my house using KiK (texting app) on iPads, iPods etc. My goal is to eliminate this applications ability to function for ANY wireless device connected to my WLAN.
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Jul 28, 2012
Using the Cisco Configuration Professional software I have created a site to site VPN connection (between a cisco 1841 and 1811).The tunnel appears to be up as far as the routers are concerned, but I am unable to ping anything on the remote networks. I thought route maps may have had something to do with this but I cant see what is worng with them.Just so you know, the 1841 device already has a functioning VPN tunnel to another site. The peers I am concerned about are 141.0.59.x and 109.238.78.x.
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Oct 31, 2011
I have an ASA5520 and need to set up multiple VPN's to some vendor sites. All these vendors are using 192.168.1.0 networks. All have public IP's and very little knowledge so are unable to NAT from their end.The idea is to create some /28 blocks of IP's (172.29.0.0/28) and manage this on our end.
How do I get this to work?
example: (all IP's are fictional)
tunnel1
VPN
My side "outside" 10.10.10.10
Their side "outside" 20.20.20.20
Networks
My side "inside" 172.30.30.0
Their side "inside" 192.168.1.0 NAT'ed to 172.29.0.0/28
[code]....
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