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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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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Jul 24, 2012
My E3000 has about 60% packet loss if the channel selected is anything other than 1. I can't enable 5GHz or even 40mhz 2.4GHz channels without dropping 60% packets.
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Oct 13, 2011
I am trying to use my WRT120n as access device for an IP Centrex service using SIP protocol. My SIP phone is located right behind the router.My problem is sometimes the router is dropping incoming calls because signalling packets are fragmented at IP level. So I cannot receive those calls.Is there a way to enable the router to accept these packets?
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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 13, 2012
I have a NAT setup. Some of my udp packets are dropping. How to find more about the NAT to find whether it missed anything or not. the router is 3945e. [code]
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Aug 1, 2012
I have ASA 5510 with 8.4 connected to ISG 1000, when traffic is passing the VPN tunnel is working fine, when the traffic stops, ASA will drop the packet but the VPN tunnel on ISG still up .When new traffic started from ISG side, it will drop, as the tunnel is not up on ASA side.
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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.
The latest rep wants a packet capture from the SG300’s VLAN2 but there are no PCs there to do this with and the manual doesn’t even talk about doing this. How we can do this as well as get the 2 divisions working together to fix this? BTW, the RV082’s exhibit the SAME exact problem. I can ping from ANY device on VLAN2 to any other device and drop packets. Copying a simple 1MB file over the VPN can take minutes where it should take 1 second. I can reproduce this for 24/7.
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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.
It appears that the RV082 is prematurely closing the natted port used to communicate with the host outside the network. The host sends a FIN, ACK packet, to which the client responds with an ACK, However, when the client then sends his FIN,ACK sequence, it never makes it outside the router. The client sends a total of 9 FIN,ACKs trying to contact the outside server, but none of those appear to make it through the router.
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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Dec 12, 2012
We have a Cisco ASA and recently purchased a cisco small business srp527 router. It is connected to our ADSL2 connection and is working fine. I have configured the device with an ipsec tunnel using an ike profile and the tunnel is created successfully with packets traversing the tunnel. However packets are being dropped intermittently, with no cause. The link is currently not being utilised, there is no load on the network however when I ping Google and any address subject to the rules of the tunnel i notice that a single packet is dropped every now and then.
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Dec 26, 2012
We have a customer who uses about 20 x c2960's switches for access layer and 2 x c3560e for distribution layer. C2960's uses C2960-LANLITEK9-M , Version 12.2(58)SE1. Everything was working fine. Now we got information, that sometimes there are problems with connectivity. Customer tries to reach internet.
SW11#sh int fa0/18
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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Aug 6, 2012
I am trying to find a solution using modular QOS when there is congestion in circuit we drop packets with WRED which are marked with a DSCP value of say AF21. I can drop those traffic completely in case of congestion. I was thinking to allocate 100% bandiwth to rest of the traffic.
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Aug 21, 2012
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.
The router is for my house and thus also has to have priority for gaming. I will add the gaming and voice QOS once I get it working,
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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Mar 27, 2012
I bought a DIR-655 a less than a year ago on amazon, and it was working great up until about 4 weeks ago. Ive noticed that it has been dropping alot of packets while I am gaming on my computer. I would run about 95-98 ping usually and now it jitters every 5-10 mins or so from 95-98 to up to 500. It is really troublesome during games and I dont know what to do. Ive tried disabling QoS and still nothing. I run on wireless G and N with auto 20/40 mhz. Standard WPA(personal) and it was running absolutely great until now. I know its the wireless because I have hardwired it into my laptop, both from the router and just the modem itself with no problems whatsoever. I dont know what to do about it.
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May 23, 2011
I am attempting to FTP to a remote site through a IPSEC tunnel.When I am transfering large files the ASA5540 is showing syslog errors stating "connection timeout". What I think is happening is after about 1 hour the firewall is closing the connection control port for the FTP session and neither end is notified so eventually the transfer is stopped.What do I need to modify in the FW to accommodate these larger files?
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Jul 26, 2012
I have a ACE module A2(3.5) installed, I am having a connectivity problem between two servers in my network. I have captured some traffic on different points in my network and from capture it seems like the problem is with this ACE module or somehow it is closing the connection.
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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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Jan 9, 2013
I recently installed DHCP snooping on a 3750v2 switch (Version 12.2(55)SE4) and configured the uplink(Po2) as a trusted port. The problem is that clients cannot receive an IP address. When I disable DHCP snooping it is working properly. DHCP snooping is configured correctly but I don't have an idea how to resolve it. [code]I tested the solution on the same kind of hardware switch and firmware and it worked out fine. What is causing the clients not to receive an IP address from the DHCP server?
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May 9, 2013
We have a remote site that is using 3750X switches as layer 2 switches back to our home site. The uplink port is showing dropped packets but the utilization on the link is never about 10%. We have a 100Mb circuit to this site. Our speed tests and iperf tests are not showing any issues that we can see. However the port is still droping packets. It is not dropping at a high rate but they are dropping.
switch#sh platform port-asic stats drop gi1/1/4
Interface Gi1/1/4 TxQueue Drop Statistics Queue 0 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 1 Weight 0 Frames 52876 Weight 1 Frames 2 Weight 2 Frames 0 Queue 2 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 3 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 1330874 Queue 4 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 5 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 6 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 7 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0switch#
Is there a way to capture these dropped packets to see what they are? We do have VOIP phones at the site and are using Qos.
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Dec 29, 2010
We are testing a new 1Gbps WAN circuit between 2 sites. We have cisco 3750 and 4507 on each end. Every time we run extended ping sweep ranging from 36 to 18024 bytes the packets are being dropped randomly once the size goes above 1500 bytes. Our ISP claims Demark to Demark test are clean and they don't want to acknowledge the problem, they blame our switches. To prove the problem is not on our end we've put different switches at each end, still facing the same issue. Ping success rate is around 98 to 99 percent.
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Jan 24, 2012
We are running ISP and now a days we have many spam in our network, we want block the SMTP port 25 block on Cisco router 7200. So we can block the spam in our network.
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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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Mar 23, 2013
I have an E1500 N300 Router, I've had it for 3 or 4 weeks now. Ever since I've had it, I can no longer send e-mails out with Eudora nor Outlook. I've tried using about 3 different SMTP's just to verify that it wasn't a server issue. I tried Port Forwarding in the router settings. I selected SMTP and POP3 and checked Enable on both, then save changes. But they don't appear to be taking, as when I go back in and try to set them again, it let's me and doesn't give me a Port Overlap warning. I've been told that I shouldn't need to mess with Port Forwarding at all, I just need to go into the Firewall settings and open up the SMTP, POP3, and IMAP ports. However, I don't see any settings in my Router settings to allow this, aside from Port Forwarding and it's not actually saving the changes. I will admit, I'm not all that great with this stuff, and this is the first time I've had any issues with a Router stopping me from E-mailing.
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Feb 20, 2009
I've purchased a WRT310N router to replace an existing wired router, and am in the process of setting up the outbound firewall rules. While I see settings to restrict access to all sites (or specific sites) for a specific protocol, I don't see an easy way to only allow access to one specific site.I want to restrict outbound SMTP to one server (my ISP's).
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Apr 23, 2012
At random times, my internet will "drop" connection and will not download any packets, but I am still able to send packets. My Local Area Connection icon continues to say I am connected, my modem is fully functional, and my cables are good. I can get my internet back up and running for 10 minutes or so by disable and re-enabling my Network Connection. If I simply try the "repair", it gives me an error at the "Refreshing IP" step.I have done a full system scan for viruses and I am clean. My drivers are fully updated, I have disabled my firewalls, and still no luck. During the times when it is down, I can successfully ping my modem through CMD, but I get the time-out error if I ping a site, my default gateway, the DHCP Server, or the DMS Servers.I have made no changes to any major settings on my computer, nor has there been any recent additions/removals of any software.
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Jul 26, 2011
I have a router with a desktop computer connected to it and a laptop and other devices like psp's, tablets etc. How can i capture the packets that the psp or the tablet sents through the router from my desktop? Is there a program or something. Programs that captures packets usually does it from one computer ie the computer that is running the program. I need to capture all packets that goes through the wireless router. How?
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May 19, 2012
I just want to know how or is it possible to hide sent/receive packets from the Router I cracked few days ago?I'm using wifi card airlive wl-1600 usb and the router is TP-Link.I mean how much is possible to hide my connectivity and everything from me with this router?
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May 15, 2012
Few are the issues that I am facing on IOS Version 15 and Cisco 1941 Router , this router is currently in production on clients.
•1. I do PAT on router interface , and it has public IP on it , when I send request to Internet via Browser from LAN client , Page does not open and when I check NAT TRANSLATION on router , Router does translate the packets. The work around I found is that when I disabled CEF on router , Web starts browsing , Why does this happen and why I need to disable CEF ?
•2.I have Public IP Pool its subnet mask is /29 , one of the Public IP from this pool is live on the interface. When I perform STATIC NAT a web server resides in LAN , then I can access this server from anywhere in the world by IP. After few days Static NAT stopped working , I again Static NAT it on other Public IP , the same issue rise again , I am not able to access this server from Internet. This issue has been faced at two clients. The same pool i have checked on 1841 router and static nat works fine on the same public IP .
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Oct 11, 2011
Does RV110W-A-NA-K9 router have a utility to send magic packets to PCs on the LAN?
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Dec 6, 2010
I'm trying to configure QoS on my 877 router to give priority to voice packets. However, when I do a show policy-map for WAN interface, all the classes show 0 bps. When I do a show int for the WAN interface, I get the correct bandwidth util.
This 877 is meant for a home network. I'm running a Cisco 7970 phone using phone-proxy back to my HQ. I'm also shaping the traffic.
Here is my config
Class Map match-any EF (id 1)
Match ip precedence 5
Class Map match-any class-default (id 0)
Match any
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Nov 24, 2011
WRV200 does not transmit packets in Router mode. This issue has been describes already here:
[url]....
So is there a solution to forcing this router function properly according to manufacturer's declaration (router mode)?
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