Cisco WAN :: 800 Router Dropping SMTP Packets

May 29, 2012

We have a cisco 800 series router between the internal network and the WAN. the problem is we are unable to receive some of our mail due to dropped packets by our router. the conversation between the two servers stops at the point were our server responds with the command 250 2.1.5 user@mydomain.com | 354 Start mail input; end with . i was able to trace the packet, using Packet Export, on the internal interface but not on the external interface. Also i have noticed that the external interface has about 160,000 unknown protocol drops while the internal interface has 0.

Is there anyway to find out way the external interface is dropping the packets.

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Cisco WAN :: 1811- MTU 1500 - Router Dropping Certain Packets

Dec 15, 2011

I seem to be having an issue where certain very packets are being dropped/lost by my office router. The reproducible situation is, when I attempt a DNS zone transfer from my linux bind DNS server (A.A.A.A) to any server on my network behind NAT (Y.Y.Y.Y) the first packet (Seq 1) of the response is lost. The client making the query asks for first packet (Seq 1) to be resent, and the DNS server attempts to resend it repeatedly, but those are lost too.

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Oct 13, 2011

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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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Cisco Firewall :: ASA5505 Dropping Packets

Apr 30, 2013

I am  having an issue where the ASA is dropping packets on the vlan  interfaces. I have it as a dedicated router/firewall for a 100mb connection .
 
Vlan1 is the internal networkVlan2 is the network to cable modem
 
Eth 0/1 is connected to a 2960G switch with hard coded 100mb Full  Duplex at each end, this is the inside interface. Eth 0/0 is the  connection to the cable modem, this is the outside interface, set at  auto at both ends.
 
Im getting on the vlans eg. 51253 packets dropped however network  traffic isnt impacted and everything runs fine, as well as 46532 switch  ingress policy drops.
 
Example;
 
ciscoasa# sh int vlan1Interface Vlan1 "inside", is up, line protocol is up Hardware is EtherSVI, BW 100 Mbps, DLY 100 usec MAC address 70ca.9b36.ab80, MTU 1500 IP address 10.x.x.x, subnet mask 255.255.255.0 Traffic Statistics for "inside": 43250588

[Code]......

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Apr 10, 2012

We have a customer who we sent to Cisco to replace some aging Dell switches. They purchased 5 SG300-52’s for 2 different networks. Their production LAN has 2 “live” switches and 1 spare. The 2nd, a development LAN has 1 switch and 1 spare. Their primary production SG300-52 has GE1-8 VLAN’d off as VLAN2 for public IPs. The untrusted (WAN) interfaces of 2 x ASA-5510’s, 1 x ASA-5505, and 2 x RV082 v2’s are connected to GE2-6. GE1 is the uplink to the co-location center’s Cisco switches. GE7 & 8 are spare ports. Each SG and device port is hard coded for 100/Full.
 
One of the ASA-5510’s and the ASA-5505 maintain a site-to-site VPN (the development LAN used to be in a different facility hence the VPN). Recently the developers have stated the performance is horrible. I noticed ping traffic loss from PCs on the dev side to servers on the production side in the order of 20-30%. I assumed it was a VPN issue so I opened a ticket with Enterprise TAC (all the ASAs and the SGs have either SmartNet or extended support contracts). TAC determined the problem happened even if you ping from inside the ASA to the untrusted side of the other ASA thus eliminating the VPN as the culprit.
 
The 2nd ASA-5510 has the AIP module and was not even live until this weekend. Turning it up and giving it a basic config returned the same results. #ping x.x.x.x repeat 100 will drop 20-40 packets. I have no security enabled on the SGs and even tried using the spare SG300-52 this weekend in place of their primary with the same result. I’m to the point of returning one of the Dell switches to production, but this cannot be a good sign. I’m also a bit frustrated that I’ve yet to figure out how to get Cisco Enterprise to speak with Cisco Small Business on this. The customer has over $10k invested in Cisco equipment and Cisco isn’t jumping in to figure this out.
 
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Feb 28, 2012

We have a setup with a MS-TMG - ASA (8.2.4(4) in routing mode) - (internal) Router - FWSM - Router - Exchange with NLB.  We have now the problem that IMAPS is not really working through this setup. It works from internal (without ASA and TMG inbetween), but not reliably through the internet. There is a rule on the ASA which permits the ports from the TMG to the Exchange NLB address.We opened a case with Microsoft and they told us that not all tcp-syn packets are received by the Exchange server which were sent by the TMG.Thus I sniffed on the ASA with a packet capture and indeed, a lot of syn packets were on the interface to the TMG, but not anymore on the interface to the internal router.This ASA also filters all other internet<->company traffic, so there's a lot of stuff running.
 
Maybe it's dropped in the ASP, or is the capture maybe not valid?Here the show asp drop:

ASA01-Internet# sh asp drop
Frame drop:  Invalid TCP Length (invalid-tcp-hdr-length)                                  1  Reverse-path verify failed (rpf-violated)                                  319  Flow is denied by configured rule (acl-drop)                            477077  First TCP packet not SYN (tcp-not-syn)                                   10212  TCP data send after FIN (tcp-data-past-fin)                                 41  TCP failed 3 way handshake (tcp-3whs-failed)                               824  TCP RST/FIN out of order (tcp-rstfin-ooo)                                 1419  TCP SEQ in SYN/SYNACK invalid (tcp-seq-syn-diff)                             6  TCP SYNACK on established conn (tcp-synack-ooo)                              1  TCP packet SEQ past window (tcp-seq-past-win)                              821  TCP invalid ACK

[code]....

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Feb 14, 2013

It appears we might have an issue with our RV082 (v4.2.1.02) dropping packets during the teardown of many TCP conversations.  I have attached two packet captures of what I believe is the same conversation.  One is from outside the router (Wireshark using an Ethernet Tap) and the other is from the client inside the router (SLES11SP2 running TCPDump).  These are both very small captures 9 packets and 18 packets and I'm hoping it will identify the problem.
 
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Is the router slamming the door prematurely?  (I've been fighting with this problem for 3 weeks now!)
 
Inside Capture:
----------------------
No.     Time                       Source                Destination           Protocol Length Info
1 2013-02-13 19:32:37.827942 192.168.1.45          38.113.116.214        TCP      76     35975 > http [SYN] Seq=0 Win=14600 Len=0 MSS=1460 SACK_PERM=1 TSval=635644783 TSecr=0 WS=128

[Code].....

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FastEthernet0/18 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is e8ba.806a.4412 (bia e8ba.806a.4412)

[Code].....

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I have a Cisco 871 router that used to have Access list based security. now I am trying the ZBFW for the first time.  I thought I had a pretty good program until I found all my traffic was getting dropped. This is my first stab at ZBFWs and I am a bit confused esp with the default class part.
 
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Guest VLAN has access to 2 IP's in Data for printing. Cisco871#sh run

Building configuration...
  
Current configuration : 8005 bytes
!
version 12.4
no service pad

[Code].....

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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).
 
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Apr 23, 2012

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[url]....
 
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