Cisco WAN :: 881 / Inspect SIP Packet Using CBAC?
Apr 28, 2013
im in the progress of Configuring a Cisco 881 Router, for a branch office.Behind this Router they have an PBX, is it prossible to inspect SIP packet using CBAC, and thereby open for RSTP pinholes.i only have 1 Public ip adresser, and im not fond of configuring thousands of PAT to the PBX.i have with success, Accomplished this with Global Inspection on ASA Firewalls, but i dont know if this can be done with IOS as well.
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Jul 7, 2009
I have seen this a couple of times on two different routers. One is a 3745 and another a 1811 running 12.4(15)T4 and 12.4(6)T11, respectively.
When we have IOS firewall running (either IP inspect or ZFW), we will experience intermittent slow HTTP connections.
Symptoms include page timeouts, CSS not loading and just overall slow performance. Disabling the inspection cures the issues.
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Jul 3, 2012
I'm playing around with CBAC, trying to get a feel for it so I can manage it on some of our routers. I think I have the basics down, but for some reason I'm still having these issues with a 2801 running the attached config:- I had to add the "router-traffic" option to my ICMP inspect line to be able to ping anything at all on the 10.10.2.0 side from the router. We have a router doing firewall duty which is using CBAC but does not have the "router-traffic" option on its ICMP inspect line, but pings from it still work. What gives? I've read that by default (without the "router-traffic" option) traffic originating from within a router will not be inspected by CBAC, so it looks like my lab router is working as expected, I just can't figure out why pings work from the production firewall router.
- I can not copy a config via TFTP to 10.10.2.97. Other network devices can access the TFTP server on .97, so it's my lab router that has the problem. I can ping .97, it can ping this router (.5). It looks to me like I have TFTP allowed through this router, but it doesn't work. When I do a copy command, my TFTP server on .97 sees PUTs coming in, but then says it's not getting responses from the router, so it looks like traffic is only flowing out from the router but not back in. I thought the TFTP inspect would fix that. There doesn't seem to be a "router-traffic" option for the TFTP inspect[CODE]
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Jan 3, 2011
I have a 851 that I'm trying to apply CBAC on. However, it seems that new sessions are stuck in SIS_OPENING. I'm guessing maybe because packets are not returned,I can't understand why - everything works just fine up-until I add ip inspect INBOUND out' on the WAN-interface.
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Jun 20, 2011
I have a 857 doing NAT for the internal vlan1 interface (192.168.20.0/24) attached traffic.ip nat source static tcp 192.168.20.5 3389 interface dialer0 3389 ip nat inside source list aclAllowNAT interface dialer0 overload I would like to turn CBAC (packet inspection) off, but still maintain an ACL on the ingress to Dialer0 (traffic in from the Web) to protect access to some sensitive material (doctor's surgery) and only allow RDP from designated sites. I realise there are other ways to publish the access to the terminal servers but this way has advantages we need, and is in place.
ip access-list extended aclAllowNAT
permit ip 192.168.16.20.0 0.0.0.255
ip access-list extended aclIngressFromInternet
permit tcp host xx.xx.xx.xx any eq 3389
...
But of course when i do this and apply the access list to dialer0 all NAT traffic stops as it doesn't have CBAC there telling to allow the inspected traffic.
What do i need to put in the aclIngressFromInternet ACL to allow the NAT traffic with CBAC off?
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Jul 1, 2011
I need to configure the access list on the outbound internet port to accept the following:
ip access list 10
access-list 10 permit PPTP vpn any xxx.xxx.xxx.xxx
access-list 10 permit RDP any xxx.xxx.xxx.xxx
access-list 10 permit FTP any xxx.xxx.xxx.xxx
access-list 10 permit Postgresql any xxx.xxx.xxx.xxx
access-list 10 permit MacARD any xxx.xxx.xxx.xxx
This method does not work on the Cisco 2921 router with FW
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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 13, 2012
Since upgrading some of computers in my LAN to Windows 7 they all experience upload issues. I have narrowed it down to CBAC inspection on my Cisco 1711 router, I am running IOS 12.3 I have a simple CBAC inspection set for TCP/UDP only without any application-specific inspects. Download works fine however upload does not seem to work atl all- unless I disable the ip inspection. It is all working fine for any Windows XP but not for Windows 7 machines. Is this a known issue, I am not sure how I can go about this - I don't want to build ACLs now for outside interface and disable stateful inspection mechanisms because CBAC has been working fine for me until recently.
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Apr 16, 2012
ip inspect firewall should be performing no inspection on traffic traversing an IPSec VPN right?
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May 6, 2013
user from home PC via Anyconnect making RDP session to work PC, on this PC Microsoft policy allow making disk mappind via RDP. Is that posible to inspect this traffic and deny this(disk mapping) action on ASA5585-X with IPS?
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Mar 23, 2013
I have a cisco 2811 router set up as a nat/firewall gateway for my network. I've configured it for CBAC on using ip inspect and an access list.What I want is to use audit-trail to record network traffic (which means sending syslog messages to a server) concerning established sessions from my own network to locations in the outside. If i configure this using ip inspect audit-trail and no ip inspect alert-off, the configuration looks like this: [code] which works just fine, but there is the matter of icmp packets.
Since i use polling software that needs to check some machines in the outside part of the network, it is only natural that several icmp sessions are established through the Inspection Rule per minute. The problem is that since these sessions are recorded along with everything else, my syslogs are flooded with these (since i am using logging trap informational) to the point that more messages are generated about icmp than all other traffic combined, especially in non-working hours.What I am asking is a way for the audit-trail to be selecively disabled for icmp, so that the outgoing (echo) &incoming (echo reply) sessions can be established without generating syslog messages.
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Aug 15, 2012
I have a cisco ASA5520 box running with IOS version8.2(5)13 where default policy map is applied globally. But I have not seen any traffic being inspected through included protocol defined under policy map.All configuration seems to be ok for me.
service-policy global_policy global
Global policy:
Service-policy: global_policy
Class-map: inspection_default
Inspect: ftp, packet 0, drop 0, reset-drop 0
[code]....
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Mar 4, 2012
I have a need to use a 3560 switch to terminate a provider's internet connection, but want to secure it so that it and the vlans connected to it are not wide open. At the same time, I'd like to use stateful packet inspection.
I have IOS 12.2(44)SE2, but IPBASE running on my 3560s. Is there an IOS (perhaps the ADVIPSERVICES of that version?) that allows a 3560 to use the 'ip inspect' command?
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Feb 15, 2012
how to enable inspect http on ASA 5510, so that URL information populate in the syslogs?
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Dec 27, 2011
ASA5510, ASA 8.0(4), ASDM 6.1(5), this is a productino ASA with plenty of lookups working through its 3 interfaces - outside, inside, dmz. The problem is a new use. I've segmented a switch on the inside network with a VLAN, and have a workstation routing through the switch to the default VLAN where all other hosts on the inside network reside so far. The ASA inside interface is the default gateway for the inside network. My test worksttion can PING inside hosts, so the static route is OK.
ASA 10.1.1.2/16 DNS Server 10.1.5.1/16
| |
------------------------------------------------------------------
|
Switch 10.1.8.20/16
[code]....
But lookups fail, Wireshark says the test workstation sends, the dns server receives and responds, but the test workstation never receives. I used the Packet Tracer tool, it gets to the last step syayin OK then finally "inspect-dns-invalid-pak". I can't find any more there to tell just what is invlid about it. So I'm trying to figure out global inspection. Here's an extract from the config:
class-map inspection_default
match default-inspection-traffic
!
!
policy-map global_policy
class inspection_default
[code]....
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Mar 14, 2011
I've been trying to figure this out for some time now. I have a network setup with a couple of users, as well as a few servers. I'm using a 3640 as my border router that is connected to a 3750 with L3 routing enabled. I am using the IOS firewall in the 3640 and am having problems with downloads and connections in general on the LAN. Downloads will start at fast speeds (~1MB/s) but after a short time, it will begin slowing to a crawl or idle. I have disabled my ip inspect rules and found that the downloads will function at full speed for the entire download.
I've looked over the router configs several times, and I don't see anything unusual. Is there anything I should be looking for? I would like to think that this router can handle the traffic of about 5 computers.
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Mar 23, 2011
I have two questions about ZBF on ASR1000 with Firewall and Flexible Packet Inspection license:
1 is IPv6 supported?
2 can I use police action in an inspect rule? I want to limit some protocols to low bandwidth. There is no police command in ZBF policy map.
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Feb 23, 2011
I want to block some social networking sites using ASA 5510-CSC-SSM, As I searched and come to know that ASA 5510 can't inspect and intercept for https traffic because it is encrypted while traversing throught the ASA. I want the ASA to make functioning for https too, not only http. Can i perform this task by updating any software on existing device?
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May 13, 2013
I have a strange problem in my ASA 5510 firewall. I turned on HTTP inspect policy to block certain URLs, but that destroyed svn communication. Interestingly, if I use simple web-browser to access svn server - it works, but any svn-client requests fail with an error "Could not read status line: An existing connection was forcibly closed by the remote host". I did some packet sniffing, and discovered that with HTTP inspect off the Webbed request is answered, but with HTTP inspect on it is rejected with an error unauthorized. Here are examples of success and failed conversation packets:
Success:
1. <Client-IP> <Server-IP> WEBDAV WEBDAV:Request, PROPFIND /svn/repos/myrepo/trunk {HTTP:3, TCP:2, IPv4:1}
2. <Client-IP> <Server-IP> WEBDAV WEBDAV:HTTP Payload, URL: /svn/repos/myrepo/trunk {HTTP:3, TCP:2, IPv4:1}
3. <Server-IP> <Client-IP> TCP TCP:Flags=...A...., SrcPort=HTTP(80), DstPort=58882, PayloadLen=0, Seq=4139355337, Ack=3464798063, Win=258 (scale factor 0x8) = 66048 {TCP:2, IPv4:1}
4. <Server-IP> <Client-IP> WEBDAV WEBDAV:Response, HTTP/1.1, Status: UNHANDLED HTTP Status Code, URL: /svn/repos/myrepo/trunk {HTTP:3, TCP:2, IPv4:1}
Failure:
1. <Client-IP> <Server-IP> WEBDAV WEBDAV:Request, PROPFIND /svn/repos/myrepo/trunk {HTTP:3, TCP:2, IPv4:1}
2. <Client-IP> <Server-IP> WEBDAV WEBDAV:HTTP Payload, URL: /svn/repos/myrepo/trunk {HTTP:3, TCP:2, IPv4:1}
3. <Server-IP> <Client-IP> TCP TCP:Flags=...A.R.., SrcPort=HTTP(80), DstPort=1137, PayloadLen=0, Seq=1075661931, Ack=4049054406, Win=64240 (scale factor 0x0) = 64240 {TCP:2, IPv4:1}
4. <Client-IP> <Server-IP> TCP TCP:Flags=......S., SrcPort=1138, DstPort=HTTP(80), PayloadLen=0, Seq=1032908784, Ack=0, Win=64240 ( ) = 64240 {TCP:4, IPv4:1}
5. <Server-IP> <Client-IP> TCP TCP:Flags=...A..S., SrcPort=HTTP(80), DstPort=1138, PayloadLen=0, Seq=4184445498, Ack=1032908785, Win=8192 ( Scale factor not supported ) = 8192 {TCP:4, IPv4:1}
6. <Client-IP> <Server-IP> TCP TCP:Flags=...A...., SrcPort=1138, DstPort=HTTP(80), PayloadLen=0, Seq=1032908785, Ack=4184445499, Win=64240 (scale factor 0x0) = 64240 {TCP:4, IPv4:1}
Packet # 4 is an actual differentiators.
I found one mentioning of that error with that assessment: "Older firewall/proxies do not understand the Webbed related HTTP requests for accessing Subversion using HTTP{ URL} in that post But not any useful tips.
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Aug 11, 2010
I am trying to configure my ASA 7.2(4) to inspect SCCP traffic from a CUCM v7.I have been advised that the ASA device needs to support the version of Skinny I am running.What version of Skinny does ASA 7.2(4) support? How can I find out what version my phones are using?
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Oct 31, 2011
i am wanting to log dropped and oop packets on a c3825 isr with ios12.3(11)T3. on other routers(like a 2951 running 151-4.M2)i can state ip inspect log drop-pkt and it will log to buffer or syslog all dropped and oop packets. can i do this on this 3825 another way
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May 12, 2013
We are currently looking at design models for a Multi-Tenancy solution.The firewall layer will be 2 X ASA's running 9.X to take advantage of VPN's in multiple context mode and mixed L3 and L2 contexts.
We will be delivering services through multiple L3 contexts (between 2 and 5 L3 contexts for services) and 1 transparent context for customers infrastructure who will then have virtual firewalls for NAT's and VPN's etc withing their own environment.
I am not very experienced with IPS so my query is; if we were to get an IPS license for both ASA's how would the IPS fit in, can we use it to inspect traffic for all the L3 contexts and the transparent context?
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Mar 17, 2011
I have 2 ASA 5510 firewalls at 2 different sites. Both running on version 8.0.4. Users are using an Instant Messaging type of application provided by a local telco here which is able to send and receive SMS using SIP (from the packet capture that I've done).
When users use the IM in site A, they are able to send and receive text messages via the IM from behind the firewall. However, when the users are in site B, users are able to send out text messages but not able to receive them.
I noticed that when I remove "inspect sip" from site-B's global policy map, users from site-B can successfully receive text messages. I have confirmed that it is the firewall that drops the packets as I have captured the inside and outside interfaces of site-B's ASA and I can see the incoming sip "request: MESSAGE" packet on the outside interface but I do not see the packet exiting the inside interface.
I have cross check both firewall configurations, and I do not see anything suspicious commands relating to sip that might cause this issue. Is there any command to troubleshoot why the sip inspection is dropping the sip packets on site-B?
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Apr 18, 2012
My workplace has a UC-540 attached to a cable modem, attached to the world wide web.
When we make VOIP outbound calls through the standard ISP, there is no auditory packet loss sympton; however, when we make calls to out sister branch through our VPN, we experience auditory packet loss symptoms.
I would think the VPN should only be affecting the encapsulation of the data. To my understanding the VPN packets and non-vpn packets all hit the router at the same time, and transport over the web in the same manner. Why would there be packet loss over only the VPN??
--Regarding QoS, if a standard layer 3 device receives a VOIP packet encapsulated in a VPN, do the QoS bits in the VOIP packet get acknowledged, or are they hidden by the VPN encapsulation?
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Sep 9, 2012
having some issues. My basic VOIP network I can get to work no problem uner Vlan 1. But when I try tomake multiple basic networks to connect and put them in to diffrent Vlans such as Vlan 2, 3, 4 and conect them the phones now say configuering IP.
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Jul 12, 2012
Isn't there a way to increase the TTL of an OSPF Hello packet or am I thinking of a different protocol? Or is it only with virtual links? I can't seem to find it in my ROUTE cert book or on the Intarwebz outside of setting TTL security, but I could have sworn I remembered configuring something like this in my ROUTE lab book that I unfortunately do not have at work.
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Oct 12, 2012
i'm doing B.E., final year.My project is IP TRACEBACK.so we hav to mark packets in router.Is it possibe to mark packet in cisco packet tracer?
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Jan 29, 2013
I'd like to know if packet tracer 6 can be download yet?
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Jan 13, 2011
I've got a lot of these messages in my logs from SVC users:Code:
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May 22, 2012
I having a basic query in troubleshooting E1 link , here im facing packet drop in the link and we are testing by providing local loop and remote loop from the CSU/DSU at local point and at remote point . I have tried ping test while the loop is given at local point and remote point ie i have pinged my local serial interface IP address (eg 10.0.0.1 -local & 10.0.0.2 -remote ) in Remote Loop i could see no errors and drops and also the traffic on the interface output and input is the same(eg input rate 1000bps and output rate 1000bps) .My query is that when i am pinging the local interface IP does the icmp packet travels till the loop point and comes to the same interface(like a boomerang) .
ICMP packet
->->->->->->->->->->->->->->->
R1 Local CSU/DSU | Remote CSU/DSU (remote loop given )
O-----------O------------------------------O |--------------------------------------O R2
<-<-<-<-<-<-<-<-<-<-<-<-<-<-<-|
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Dec 8, 2010
We are working on taking a port off of a switch and connecting it to a mux (TAC 900). Port is trunked to another switch in another geographic location. From wht I am being told from the engineer who handles the transmission end of things he said once our segment is physically connected the mux will crash. He supplied the error code to the vendor and they said it is crashing because of a jumbo packet in excess of 1536 bytes. Soon it will be a moot point as the hardware will be, upgraded but we need tis running NOW.
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Oct 17, 2012
I think packet flow is changed in 8.3 IOS and above.We are using private NAT for ouside traffic.why we are using private IP for outside traffic?
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Mar 18, 2012
I have been using "debug ip packet" on a Cisco 2921 running IOS 15.1(4)M1. The problem I have is that, although I am using an ACL to limit the output, I am seeing some output that is distracting from what I am trying to see. Specifically, I am seeing the following:
Mar 19 20:22:36.135: IP: s=192.168.20.253, d=224.0.0.2, pak 30DB6D4C consumed in input feature , packet consumed, MCI Check(80), rtype 0, forus FALSE, sendself FALSE, mtu 0, fwdchk FALSE
[ code]...
These would appear to be HSRP messages. But I don't understand why they are appearing when I configure "debug ip packet 101". The ACL is pretty simple:
access-list 101 permit icmp host 96.87.145.1 host 192.168.20.1
access-list 101 permit icmp host 192.168.20.1 host 96.87.145.1
So I thought the implicit "deny ip any any" would block these messages. I even tried to block them specifically using an extra line:
access-list 101 deny udp host 192.168.20.253 host 224.0.0.2 eq 1985
But still they show up!
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