Cisco WAN :: Packet Drop In E1 Link?
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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Feb 4, 2013
IXIA----DUT-----IXIA
| | |
|_______ |________|
DUT has redudant connections to IXIA. Im pumping traffic from IXIA and traffic takes PATH A .. When I shut PATH A, i expect traffic to shift to PATH B within 100ms (example). How do I test this ?
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Oct 23, 2012
I have a 1841 router connected to an ISP (currently SDSL EFM 10Mbps through an ISP modem, the router and the model are connected with a FastEthernet interface). On another location I have a linux server.There is an ipsec tunnel (3des-sha esp) between the router and the linux server (actually done with a crypto mac).The router has a hierarchical QOS policy on the egress interface.When sending traffic from the network inside the router to the linux host without the ipsec tunnel, everything is working fine and throughput is correct.When sending traffic from the inside network to the linux host internal ip through the ipsec tunnel, some packets are lost and the traffic throughput decrease.When sending traffic through the tunnel in the reverse direction (from the linux host to the internal network), everything is fine.I looked at the QOS statistics and the dropped packets counters don't increase. I looked at the egress/ingress interface statistics and no packets dropped there.I lowered the MTU on the egress interface, but it didn't solve the problem. I played by sending various ping icmp packets size, but even small packets are sometimes lost.I tried to check the router CPU, but it seems relatively fine (<= 10%)I captured the traffic on both side, and I see the packets emitted, and then I can see that some of the esp packets of the corresponding side are not received, so it looks like the cisco router is the culprit. This 1841 router is running: 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(24)T4,How can I troubleshoot where and why those packets are lost?
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Mar 9, 2011
I am running ping between two Nexus 7018 over WAN link ,and I can see some set pattern of packet drop(7.40 % drop) with MTU size 1500.When I ping between my 6500 VSS pair and same Nexus 7018 over different SP WAN link on diffrent location , I am still getting same kind of packet drop (8% drop) with MTU 1500. Has any one else come across this issue with Nexus?
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Dec 14, 2011
here's my setup :
office 1 :
rv042 hw3
ISP:Obtain an IP automatically
office 2 :
rv042 hw3
ISP:PPPoE
VPN tunnel between both rv042, everything's fine but when i try to ssh from office 2 to an office 1's server, my connection drops.
When it drops, i can still ping pc in office 1, this is really strange!if i change the office 2 ISP to another provider (obtain an IP automatically) everything's ok !
i try to use another PPPoE ISP for office 2 and it's doing the same thing!I've also tried other rv042 in both locations with the same setup and it's doing the same thing, so it's not a router issue.
i've tried older firmware and it's doing the same thing, so it's not a firmware issue!
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Nov 1, 2012
My workstation(10.0.0.250) directly connected to 6509_1 switch. 6509_1 is gateway with ip 10.0.0.5/22. Sometimes routing stop working, but after 3-5 minutes all back to normal.When issue occur i can't ssh to 6509_1, but i connect to second 6509_2 (10.0.0.6) and i can ssh to 6509_1 from it.Then form 6509_1 i try to ping my workstation Wireshark on my workstation show that packet arrive. My workstation reply on it, but switch not accept it.How it possible? As I say after sometime all go back to normal without any changes. [code]
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Jul 13, 2012
I have an 887VA-w connected at home. I am using ip virtual-reassembly an all interfaces (dialer and all internal VLANs), I am also using CBAC (currently setting up ZBF). The issue I am having is that I keep getting drop packet error messages and the reasons can differ. Below are some of the outputs I recieve: [code] I have done a show ip virtual-reassembly on all the interfaces and the counter is shown as 0.
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Feb 25, 2013
I am running (cat4500-ENTSERVICES-M), Version 12.2(53)SG2 on the switch. I have a scenario where I have 3 end user equipments connected to a Cisco 4948 L3 switch. At the switch end port 1/46, 1/47, 1/48 are the terminating points for these 3 devices . I have added these three ports to VLAN140 (switch port access vlan140 on the gig interfaces).
The device connected to 1/46 is the one I'm testing some signalling features on. My requirement is to have intermittent packet drop on this interface so that my signalling associations would go down now and then. I'm trying to simulate a real-time network congestion/latency/packet drop in a simple manner.
I do not want to shut/no shut the 1/46 intf to cause this. Some way to achieve intermittent packet drop on this gig1/46 intf ?
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Nov 27, 2011
In my cisco 3845 router I can see output packet drop in some of the interfaces.I suspect that router is processing packet beyond its mix throughput limit. Moreover when i run show int fax/y switching command I can see packet drop by RP process.
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Jan 27, 2013
My network Infrastructure consists of 2 core switches(cisco 3950, 24 port) and 3 access switches (cisco 2960G, 48port). No distribution layer.Both Core switches are connected to the BVI of a VPN router.PVST is running in all switches. The STP results are all good. We have 3 VLAN's in the LAN an IP routing is enables in the core switch. The network diagram is attached.
The issue we are facing is that , we get intermittent packet drops while pinging towards the access switches, and there is always a higher latency towards these assess switches.These issues are present even with no other users using the LAN. But these issues are not present while pinging towards the GW.
I guess, it is because of this, we have issues the accessing file server in the LAN. How do we go ahead with the troubleshooting. Will upgrading the IOS resolve this.The present version details is..
WS-C2960G-48TC-L 12.2(44)SE6 C2960-LANBASEK9-M
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Oct 24, 2011
I have an Cisco 6500 CS and there is a Cisco Unified Communication Manger Server connected directly to the Core Switch.I tried to change duplex and speed ( fix and auto ) for both sides, but the same problem.
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Apr 20, 2011
I had a D-link DSL-G604T router which recently had begun to drop connections, so I decided it was time for an upgrade. I bought a D-link DIR-615 and followed the instructions on the CD, but no internet connection. After several hours of hair pulling I came accross a solution; If I connected the internet port on the DIR-615 to one of the ethernet ports on the DSL-G604T using an ethernet cable I could then connect to the internet.However this defeats the point of having a new router if I have to use the old one to connect to the internet.Is there a way to configure the DIR-615 so that is works properly?
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Dec 30, 2010
I recently upgraded my network because my DIR-655 started to drop connections. My new routers (a Netgear ProSafe VPN Firewall SRXN3205) is working great, but I'd like to re-purpose my D-Link as a wireless bridge.
According to Netgear support, I need to link my DIR-655 to another access point connected to the network over wired Ethernet. No problem there; I have a DAP-1522 connected via Ethernet on the floor directly below the location of the DIR-655. I was under the impression that although the signal was going through the floor, the physical distance to between the two devices would be sufficient to make the connection. No joy. I use the push-to-connect buttons on the two devices, but they do not connect. Is the floor the only issue? I do have an ANT-24 antenna extension for the DIR-655 router -- would that make any difference. As I say, the physical distance between the two devices is less than 10 feet.
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Jun 12, 2012
My requirment is to drop the Internet traffic once the Cisco HWIC 3G backup link will become active(attached) .Because I should allow only Business Critical Data allow through that and others should drop. Here are the config I used. In here I used a standard access list to generate intersting traffic which allow all the traffic traverse through the backup link.Can I drop the packets to the proxy (192.168.1.100) using this access list and allow other traffic.access-list 1 deny 192.168.1.100access-list 1 permit anydialer-list 1 protocol ip list 1.Is this the proper way I should follow ? Is there any other good method to achieve my requirement ? [code]
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Jul 23, 2011
I have used DIR-655 (HW:B1 FIRM: 2.00NA) with Motorola SB6120 for sometime without any incidents. My dl speed usually is around 26mbps. Lately, it happens twice that the dl speed drop to 10mbps. If I connect the SB6120 directly to my PC, the dl speed is 30mbps. Is my DIR-655 dead?
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May 7, 2013
I have two routers, Cisco 3825 and 2811 connected via a p2p ethernet link. The two sides of the links have Huawei muxes with 100/ full duplex set on their interface. I am facing almost 40% packet loss but the supplier is unable to identify any issues at their end. We have tried setting different combinations of duplex and speed settings but no improvement. When set to auto/auto the interfaces are negotiating to half duplex and I am sure this is the cause of the packet loss. Also I heard of auto-negotiation on MUX ports but supplier confirmed no such settings but only 100 Full duplex. If the router iterface is negotiating to half duplex so I suppose there is some thing with the negotition problem with MUX and router port ?
On C3825 I have a Gig interface whileas C2811 has fastEthernet. I guess Gig interface should not negotiate ? Is there a way to pin point the exact fault to supplier ? Also is there work around for this?
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Jul 29, 2012
On my network I have a Netgear ReadNAS connected and I'm using an add-in (ReadyNAS Remote) that simplifies the log in to for both internet and LAN-users. However, I get a lot of the following entries in the log when that add-in is being used.
When an internet user log in via ReadyNAS Remote: "Blocked outgoing TCP packet from 192.168.0.xxx:3649 to xx.xxx.xxx.xxx:50125 with unexpected acknowledgement 3320366884 (expected 754541166 to 755655246)"
When a LAN-user log in via ReadyNAS Remote: "Blocked incoming TCP packet from 69.xxx.xxx.xx:80 to xx.xx.xx.xxx:50329 with unexpected sequence 3004123085 (expected 3004136875 to 3004393915)"
how to prevent them from occuring?
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Feb 1, 2011
I've been fighting with getting VPN connections working properly with my Dlink router. I set up virtual servers for PPTP and L2TP and could usually get the first attempt to work. Subsequent client connections would always fail.The logs display the following-Dropped GRE packet from 192.168.0.10 to 64.232.xxx.xxx as unable handle packet header. Blocked incoming GRE packet from 64.232.xxx.xxx to 76.105.xxx.xxx.What seemed to fix it was going to Firewall Settings and setting UDP Endpoint Filtering to Endpoint Independent and TCP Endpoint Filtering to Address Restricted.
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Nov 27, 2011
Using a Samsung Galaxy S2, iPod Touch 3rd Gen, and Nook Color, they are all experiencing retry problems, even when 3 feet from the DIR-601. When I use them my log gets filled with messages like:Blocked incoming TCP Ack packet from 192.168.100.201:2926 to 209.85.145.113:80 with unexpected sequence On the devices I see the downloads/content taking a long time to appear and often I get a blank page or "Retry" messages. I purchased two DIR-601s and get the same problem with both. They are both running 1.02NA firmware. The WLAN is Time Warner cable modem. Prior to this I had a Linksys WRT-54 that gave great performance, though just at B/G speeds. I was hoping for a performance boost but right now the N speeds are slower than B with the retries.
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Feb 23, 2011
We are facing issue of continous packet discards On nexus4001L link (int po2) to Nexus5020 switch. Nexus4001L is installed in IBM blade center server and we have FCOE enabled in this setup. [code]
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Sep 15, 2012
As per CISCO QoS document URL, IOS from 12.2(13)T support drop command in policy map. But our CISCO ASR 1013 having IOS of Version 15.2(1)S1 doesn't have drop syntax.How can we drop specific application using QoS in ASR 1013 of IOS version 15.2 and higher?,Can I allow few users for a particular application (like P2P) and drop other users based on users source IP?
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May 8, 2013
We've had Cisco 1252 APs running on PoE (3750E gives the port 20W of power) for well over 3 years with no problems. These have not been touched, moved or configured since they went in.
All of sudden we're seeing these APs drop off the network and investigations reveal that they show as IEEE PD when you do a show power inline.
Some of these are slated to be replaced after the ports were changed, the cables replaced and port reset (also an old spare 1252 was inserted in to one of these ports and it came up fine, indicating an issue with these APs).
If it was one or two then maybe I could believe that the APs are at fault, but with so many (10 so far) I'm struggling to believe it. Could it be the code we are running on the switches? We are running 12.2(50)SE3.
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Jul 18, 2011
my Cisco anyconnect VPN clients are able to access all of my internal networks accept to another site which has a IPSEC VPN site-to-site. The Cisco ASA forwards the packets destined to this remote site to a Cisco router which NATS the source addresses (pool 10.17.252.0/24) to a 192.168.46.0 range. The remote network is 155.x.x.x which I have included in my internal subnets object-group and added a route on the ASA to route it inside.
I have configured NAT so that it does not NAT anything from the anyconnect client range to the internal subnets. I am using version 8.3(2) and the NAT rule is:
nat (outside,inside) source static SSLPOOL SSLPOOL destination static INSIDE_NETS INSIDE_NETS
I can still not connect to the remote side via the VPN; when I run this throught packet-tracer, I get a failure on phase 6:
Type: WEBVPN-SVC
Subtype: in
Result: DROP
Result:Drop reason: (acl-drop) Flow is denied by configured rule
I cant seem to work out what it is that is blocking it. The NAT rule above is rule 1 in case some other NAT rule is causing the issue..
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Apr 2, 2012
i see that the wifi on the SRP Freezes. If i am connected via lan, i can still surf the net or connect to another access point on the network and surf. But the wiress devides connected to the SRP loose connectivity even though it shows that the wifi connection is connected. I am running on the latest firmware. this problem has started occcuring only recently
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Jan 30, 2013
I have a problem with configuring of my vwic3-2mft-t1/e1 card on Cisco 2821 router. I need drop some raw data timeslots from E1 frame and then insert them into frame on other port. I enter the following commands:
card type e1 0 0
controller e1 0/0/0
tdm-group 0 timeslots 1-4
clock source line
controller e1 0/0/1
tdm-group 2 timeslots 1-4
[code]....
I find these commands in Cisco 1 and 2-port T1/E1 Multiflex Voice/WAN Interface Cards for the Cisco 1700 Series Router configuration guide for vwic2 cards.But this config is not working properly. show connect output is showing status of connection "UP", show controller e1 shows no errors on both e1 ports, but data not flows between ports.What am I doing wrong? Have vwic3 and vwic2 cards different configuration procedures or not?
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Sep 11, 2012
I have a working configuration with a 2811 router at my remote site in which I take the T1 (point-to-point PRI) into port 0/0/0 on the dual-port vwic2-mft-t1/e1 card. Then I plug my PBX into the 0/0/1 port. I channelize the T1 so 1/2 of the channels are used for data (13-24) and channels 1-8 are passed through the vwic2 to the PBX. I'm using the connect tdm t1 0/0/0 0 t1 0/0/1 0 command to pass the voice calls through to the PBX.
I tried to upgrade the router to a 2911 with the same card and the same configuration copied and pasted over and as soon as I put the connect tdm t1 0/0/0 0 t1 0/0/1 0 statement in, I drop the data side of the T1 and lose my connection to the WAN. If I take the command back out, the WAN still doesn't come back up until I reboot the router.
Has the syntax changed? I have a case open with TAC but so far no luck, as they can't seem to figure out which group should take this case, voice or data..
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Nov 10, 2011
ASA 5510 running without issues for a while but we needed extra port so added a 4GE SSM.
Having installed the 4GE SSM we had some issues with the card not liking a connection to our switches and only working by plugging directly from the server into the firewall, not great as we wanted extra servers on the line in the future. So we upgraded the firmware and no are at an impasse.
We have upgraded to 8.0(4)3 and now we cannot get any traffic through the port, we can't even connect to an external DNS server. Running a packet trace I get an immediate error on the first step '(l2_acl) FP L2 rule drop', and it appears as though the outside connection is down.
I have some experience on setting up basic port forwarding and NAT for internet access, webservers, mail but this has thrown me.
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Jan 9, 2012
I verified that the VPN implemented between a static IP address and a dynamic IP address every time the GPRS router IP address change address, the VPN does not rise.
I attach the configuration implemented by ASA5505 dynamic side.How can I fix it?
: Saved
: Written by enable_15 at 06:45:34.029 UTC Sat Dec 3 2011
!
ASA Version 8.2(1)
!
hostname ASA2
[code]...
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Jan 12, 2012
I've recently just moved house and we got Virgin Media 50mgs broadband installed with their wireless super hub which is also a Netgear product.However I first noticed up in my room I have weak signal on my wireless devices I have my Dell laptop, xbox 360 and desktop pc with wifi card.I researched this and went out and bought a Netgear wireless extender:
[code]...
Now this does work it gives me excellent signal but it keeps dropping the connection which is extremely frustrating when playing the xbox or on an online game on the pc.I contacted Netgear and all they suggested was updating the firmware
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Jun 4, 2012
I currently have an issue with the wireless internet at home whilst watching videos, playing online games, completing homework etc... On the computers working over the wireless network there seems to be a randomly occurring drop out of the internet. My home network connection looks to be solid, but the internet drops out for around 5-10 seconds and then comes back.Here is a screenshot from Xirrus the wifi inspector program from the pc in my room connected via the network:[URL]The home network (Munasinghe and family) had a signal of -78 dBm.The second signal, Optus (name of ISP) wifi had a signal of -85 dBm. This signal value often decreases or disappears altogether.
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Jan 24, 2011
This is not a problem I would not have noticed save for starting to use Skype. Every 10 to 20 minutes, my internet drops out. This occurs whether my laptop is connected via LAN cable or wirelessly to the router. Skype drops down to one bar, then drops out, and tries repeatedly to redial, sometimes achieving a very scratchy voice call for several seconds before dropping out again. If you redial in 2 minutes, it is fine and achieves medium quality video calls. Whilst skype is floundering around, I can sometimes browse the internet, but sometimes it is offline. I have phoned my ISP and they claim no problems on their end. Beyond that I really don't know where to start on looking for the problem.
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Aug 4, 2012
Well while browsing net on my mobile/laptop suddenly the Wifi get disconnected. But the wifi of access point does not drops. Its connected to the router in which wifi drops.Also the net on my desktop connected to the router via ethernet cable, does not go offline. I re,ain connected to net via Desktop even when wifi drops.
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Feb 28, 2011
I had a Linksys Wireless-G router for a long time and had very good luck with it. However, I ended up getting a couple of Wireless-N devices and wanted to get a different router. I bought the Linksys E3000. I got it home and set it up, and at first it worked. Then it would all of a sudden drop everything connected to it. I would restart the router, and in short order it would drop all connections again. This completely baffled me for awhile, until I actually touched the bottom of the router, and it was quite hot. I had it laying flat on a a table, so I could never understand why it was getting so hot. Anyway...I stood it up on it's side and it worked for awhile. Then it would randomly drop various things connected to it. The last straw was when I was listening to internet on the Apple TV, while viewing the internet on my PC and it started dropping the connection every five minutes. Anyway, I have now hooked my Wireless-G Linksys back up and it is working great.
is Wireless-N even needed? I live in a small place, so I don't need it to reach a long distance, and I don't transfer a tremendous amount of date wirelessly, so that doesn't really matter. Should I even try to fix this router? I looked on the Linksys page and I am running the newest firmware.
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