Cisco VPN :: 8.21 / Packets Dropped At Encryption Stage?
Apr 27, 2013
I am truly struggling with the changes after 8.21. I am trying to get a VPN up between two sites. This is the B end, I am sure there are a bunch of problems in the other end too. Eg. the tunnel NAT does not have the right priority 1.when I establish the tunnel I get this:
3 Sep 01 2008 11:23:37 Tunnel Manager has failed to establish an L2L SA. All configured IKE versions failed to establish the tunnel. Map Tag= outside_map. Map Sequence Number = 1.
# packet-tracer input inside tcp 10.2.32.11 80 10.1.1.10 80
Phase: 1
Type: ACCESS-LIST
Subtype:
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Aug 20, 2012
I am using WAP4410N access point to connect 5 computer to the network. Recently the wireless network is very bad; pakets are often being droped, very high reply times. I have upgraded to the latest firmware tried to change configuration with no use i even tried the default configuration. I assumed that there's interference. I tried another AP ( linksys one) and things seems to be okay. what would be the problem with AP?
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Jun 9, 2013
I happen to noticed the FWSM was dropping packets at about 387 packets every 5 minutes. My outside FWSM is WAN facing and has a 1gig link (35% utilized) my inside facing has about 100 downstream switches to the closets. I do not see my 6509's back plane is being over utilized and my understanding of the FWSM show be go for 5 gig so it isn't oversubscribe. Why i am seeing packets dropped?
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Jan 27, 2012
I notice that I have TX Packets Dropped only under the wireless section.This occurs when the wireless network is not in use also.I have tried many different channels, almost all of them.Im using wpa2-tkip+aes, mixed g and n network, auto 20/40, wps disabled.I understand about wireless interference also.wireless devices dont seem to have any issues though, not dropping from network.I usually get 4000 wireless TX drops a day. LAN and WAN show No TX drops
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Dec 5, 2012
Our Cisco ASA 5510 running 8.4(4)1 just started dropping packets and our AnyConnect clients are seeing horrible performance. The system is extremely slow compared to just a couple days ago.Nothing has changed on the system. I can post the configs if needed.
firewall# sho int
Interface Ethernet0/0 "outside", is up, line protocol is up
Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec
Full-Duplex(Full-duplex), 1000 Mbps(1000 Mbps)
Input flow control is unsupported, output flow control is off
Description: == WAN Interface ==
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I have done a "sho vpn-sessiondb detail svc" and I can see the dropped packets of the individual users, but cannot see why the packets are still dropping.how I can correct this and restore speeds?
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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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Mar 13, 2012
I have a problem with the 6500 not exporting netflow data. They are not exported due to no fib.I have read somewhere that this has something to do with VRF. VRF are running on the router.ip flow ingress has been applied to desired ip int.Is there anything I could do to make it export netflow data?
VSS-core-XXX-rs1#sh ip flow export
Flow export v5 is enabled for main cache
Export source and destination details :
VRF ID : Default
Source(1) xxx.xxx.83.253 (Unknown)
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Jun 25, 2012
I have a couple of Switches Blade 3120, working as active-standby model (HSRP) on a new site deployment. There are other 20 sites more or less, working on the same model, without issues. But in this one, we are seeing a high cpu usage. The traffic going through the platform is 600Mbps (on peaks), and in this case we have 40% of CPU usage. Traffic should be close to 3 Gbps. When we tried to send the whole traffic through the platform, active switch began to drop packets on the majority of interfaces.
When we analyze the CPU usage, there is a special process called "HL3U bkgrd proce" always have the most CPU use, but we do not know what concerns. We do not know if it is caused because there are PBRs configured. It should not matter. How I mentioned, there are other sites working fine and have had always the same PBR number.
What is causing the high usage?. Is there a special debug we could to perform to diagnose the issue?. Also, we have seen a high interrupt CPU usage (9% in this case).
bog-sib-INT-rtr-1#show processes cpu sorted 5sec
CPU utilization for five seconds: 30%/9%; one minute: 25%; five minutes: 23%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
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Mar 13, 2012
On one of our N7K, we have some packets dropped by the COPP policy in the class-default class-map. Partial results of "show policy-map interface control-plane" not so long after clearing the counters : [code]
what traffic is dropped by the policy ? Is there any logging possible ?
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Aug 2, 2011
I have a strange error on my home network that I cannot find a solution to.I have an Huawei SmartAX MT882 from TalkTalk acting as a modem connected to a D-Link DSL-G624T acting as a router/switch. Connected to the D-Link I have a Windows 7 Pro machine (64-bit, SP1) and an XP (home i think) machine (sp 2 i think).The SmartAX modem is set up to perform DHCP and DNS relaying and the D-Link has DHCP turned off and DNS relay turned off.The Win7 machine can access the network, get an IP address and access the internet without problems, regardless as to the status of the XP machine.The XP machine can access the network, get an IP address and access the internet with no problems ONLY of the win7 is powered up. When the win7 machine is off, the XP machine seems to drop about 25% of the ping packets between it and the D-Link router and has no internet access (because of this i assume). [code]
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Oct 30, 2011
I have a new pix 515e for Home practice.
1. I couldn't telnet the switch after configuring. should i have to use cross cable or not to connect PC-PIX? (as new switches and routers run through straight cable). more importantly i couldn't even ping the inside ip which is telnet and ssh enabled.
2. Receiving the following after executing each and every command on global mode.
-Configuration Replication is NOT performed From standby Unit to Active Unit
-Configurations are no longer synchronized.
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Oct 30, 2011
Stuck at Initial stage CISCO pix 515e
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Feb 11, 2013
I have a problem when trying to access from a workstation on the internal network to an external FTP server using Explicit FTPS. After the server requires the client TLS Authentication the client inits TLS but the connection is closed by timeout.
I have disabled the FTP inspection on the firewall and I have opened some high ports from the Internet to the test workstation (ACL and NAT rules), but without results.
If I try to connect from a workstation to the FTP server using a direct Internet connection I can access the FTP server without problems, so I think the problem is in the ASA.
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Jan 16, 2013
I have got 3 wifi routers i want to daisy chain. Router 1 is main modem router, which is connected to 2 pcs and 2 wif routers (wired separately), both of these wifi routers have there own ip address and dchp turned off, so they work fine and broadcast wifi nicely. now what i want to do is connect another wifi router to one of these routers (not the main one) but what setting do i need? i tried to connect the 3rd wifi router with the same setting as per the other two ie diff ip and dchp off, but when i plugged it into the port of the second router it would not show as connected or get an internet connection. Its probably quite simple to sort out, but with me being a dimwit i am tering my air out. If i could not use a wifi router for this 3rd connection, is there any other way of putting an extra 4 ports on to my second stage router.
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Jul 28, 2012
Where can i find my wep encryption key?
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Nov 30, 2012
Is it possible to have a 64 bit and 128 bit encryption key activated on the same router at the same time - one for laptop and one for wireless printer
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Jun 23, 2012
I need to locate my encryption key.
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Feb 3, 2012
Is 3DES on ISAKMP considered to be secured for your average site (other options are AES/DES)? I'd imagine AES should be much stronger but what about DES, is that considered adequate or broken? Is there any proof of concept attack against 3DES on ISAKMP (or ISAKMP in general)?
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Oct 7, 2011
how IPSEC VPN works but i hit a stumbling block understanding symmetric encryption keys.Here is my understanding about the process
1.Peers will negotiate plocies
2.Authenticate using pre-shared or certificates
3.Exchange DH Public Keys
4.Using Public keys encrypt symmetric key and exchange the same key which will be useful for communication
5.maintain sessions
But when we are configuring we will define encryption keys in isakmp phase and ipsec transform set ,i thought we will use the same encryption key for both management and data communication in fact i thought management phase is to give us a securely exchanged encryption key for the data tunnel.But we can use 2 different encryption keys in 2 phase i am bit confused.
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Oct 2, 2012
A wlan on my controller is configured for WPA2, AES encryption and a PSK. A vendor will supply me with a wireless device for this wlan. The vendor asks if we use AES 128 or AES 256. I had always believed we use AES256 but I can't verify this. How can I verify this to the vendor?
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Jul 2, 2011
I have a Cisco 877 router and I configured it to act as a VPN server, supporting both PPTP and L2TP VPNs. I can succesfully connect to it from Windows computers using the built-in VPN software.There is only one problem: when using a PPTP VPN, encryption doesn't work. If I configure the client to require encryption (default setting), the connection fails with an error about the remote endpoint not supporting it. If I remove the encryption requirement, the connection succeeds. I've also tried tweaking the encryption settings (40/128 bits), but this didn't work either. [code]
The router's IOS version is 15, and it fully supports encryption. The strangest thing is, encryption is actually required in the router config; but not only the router doesn't seem to offer it... it also accepts unencrypted connections, which it shouldn't. It's like the ppp encrypt mppe auto required command is completely ignored.
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Dec 21, 2012
I've some VPN encryption method questions.Is it recommended to use different encryption algorithms for both VPN phases (phase 1 and phase 2)?I’ve read once that it is much secure to use different encryption algorithms for each phase.In my opinion, I would go for the AES256 algorithm in both phases. But maybe it is a better idea to use AES128 or AES192 in the first phase and AES-256 in the second phase… I don't know.After saying this, I’m also wondering about the best VPN encryption setup for a site-to-site VPN (IKEv2) when using a Cisco ASA like the 5510, 5520 or the 5515.Which encryption method is recommended for phase 1 and phase 2Which PFS / DH-group should be used (considering CPU load and security)
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Sep 13, 2012
the guy who set the key for WPA-PSK and another one for WEP left... Anyway we can figure out what the key was?
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Dec 5, 2012
I have two cisco airenet 1252 autonamous access point that are configured as point to point bridge. Now I want to confiure AES encryption or WPA2 using a pre-shared key however I do not see the option to do this . The only option I see under ciphers are:
wep 128
wep 40
TKIP
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Is it possible to use either AES or WPA2 using a pre-shared key on the 1252 autonamous access point? preferably using the web interface.
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Mar 14, 2011
Due to network security audit we are interesded in encryption algorithm used for authentication of administrator and operators in Starent Networks ST40 Intelligent Mobile Gateway. To be more clearly, we need to know what type of hash is used for password storing when "showsecrets" command is omitted.
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Jun 29, 2011
I have a Cisco 877 router at home, and I'm trying to configure it to act as a VPN server in order to be able to connect to my home network when I'm outside; I want it to work with standard Microsoft VPN client software (which supports PPTP and L2TP).
This is the output of the "show version" command:
Cisco IOS Software, C870 Software (C870-ADVIPSERVICESK9-M), Version 15.0(1)M, RELEASE SOFTWARE (fc2)Technical Support: [URL] Copyright (c) 1986-2009 by Cisco Systems, Inc.Compiled Wed 30-Sep-09 08:42 by prod_rel_team
ROM: System Bootstrap, Version 12.3(8r)YI6, RELEASE SOFTWARE
The router has quite a basic setup: a single username with privilege level 15, a single VLAN comprising all four Ethernet ports, an ADSL connection to my ISP, an internal IP address of 192.168.42.1/24, an external IP address assigned by my ISP, NAT enabled.
This is my current configuration (stripped of non-relevant or private information):
service password-encryption
aaa new-model
aaa authentication login default local aaa authorization console aaa authorization exec default local
aaa session-id common
[Code]...
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Jun 20, 2011
I have 2 Cisco 2811 routers that are installed in different locations. I set up a tunnel connection between the two routers.
[code]...
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Dec 3, 2012
I want to change my encrytion password-How do I do it?
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Dec 10, 2011
I have laptop, mac and xbox 360 all working, just got ps3 and cannot connect it, cannot find wep key for wifi 12 hours plus trying to get this done.
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Dec 26, 2012
How do I change my wi-fi password?
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Feb 3, 2012
attempting to connect a blu-ray player and it asks for encryption key for the network.
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Apr 25, 2013
I can't find information about two features in 1524PS and 1552E/EU:
1. Does it have WEP encryption ?
2. Does it have SNMPv3 protocol for monitoring and remote managing ?
I guess, that software is similar in both, so answer will be the same in 1524PS and 1552E/EU.
How to confirm this features in 1524PS ?
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Aug 16, 2011
We want to provide an end to encryption service using an ACE02 in a CAT 6509E. This is covered in the ACE config guide so should be OK. The issue is that we want to include traffic inspection using an IDSM2 so we need to seperate the decrypt and encryption stages and send cleartext traffic to the IDMS2. The Security and Virtualization in the Data Center pdf page 18/19 suggests that it might be possible. The design depicted there though is only doing SSL termination, then sending the clear text onto a WAF, and onto IPS but it does say end-to-end encryption is also possible.So in essence what we want to do is have traffic from clients destined for the server farm decrypted by the ACE and sent to the IDS. We then want the traffic to return from the IDS to the ACE to be encrypted and sent onto the server farm.
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