Decide How To Debug Ipsec Vpn Cisco
January 22, 2022
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If you are seeing how to debug a Cisco IPsec VPN error code on your PC, check out these solution ideas.
Presentation
Does this document describe common debug commands that are used to troubleshoot IPsec problems in PIX / ASA and Cisco IOS software ? . This file assumes that IPsec is configured. For more information, see Common IPsec Error Messages and Common IPsec Problems.
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For the most common ipsec VPN troubleshooting solutions, see Common ipsec L2L VPN and Remote Access Troubleshooting Solutions and call Cisco Technical Support.
Requirements
Requirements
Components Used
Information in this log is based on the following software and hardware versions:
Cisco iOS Software
IPsec implementation kit.
56i – Indicates that the Data Encryption Standard (DES) feature is not enabled (in Cisco IOS Software Release 11.2 and later).
k2 – Indicates the Triple DES feature (in Cisco IOS Software Release 12.0 and later). Triple DES is available later and very often in Cisco 2600 partitions.
PIX is V5.0 in the evening and requires a single and triple DES license key to activate.
The guidance for this document was created based on devices in a specific lab environment. All mobile devices used in this document were launched with a remote (default) configuration. If your group is active, make sure you understand the possible consequences of the order.
Conventions
For more information on document conventions, see Cisco Technical Tips Conventions.
Debugging Cisco IOS Software
The topics in this component describe commands for debugging Cisco IOS software. For more information, see Common IPsec Error Messages and Common IPsec Problems.
Show Crypto-Isakmp Sa
This is a series of commands that control protocol security associations (SAs)Internet Security Associations (ISAKMP) are created between peers.
Show IPsec Cryptography
This command displays the IPsec SAs established between peers. An encrypted channel is built between 12.1.1.1 and 12.1.1. For paired traffic passing between service providers 20.1.1.0 and 10.1.1.0. You can see two Encapsulation Specific Security (ESP) payloads generated for the inbound and outbound airlock. Authentication Header (AH) is not used because there is no SA ah.
This release demonstrates the superior performance of Crypto ipsec Leadership sa.
graphical user interface: FastEthernet0 Cryptoplan label: test, local address 12.1.1.1 Local identifier (address / mask / security / port): (20.1.1.0/255.255.255.0/0/0) remote identifier (10 (address / mask / protection / port): 1.1.0 / 255.255.255.0 / 0/0) current_pair: 12.1.1.2 AUTHORIZATION, flags = origin_is_acl, #pkts 7767918, encaps: #pkts secure: 7767918, #pkts digest 7767918 Decrypt #pkts: 7760382, Decrypt #pkts: 7760382, P believe #pkts 7760382 #pkts compressed: 0, #pkts uncompressed: 0 #pkts not too compressed: 0, #pkts included. failure: nothing, Failed to unpack #pkts: 0, # send error 1, # recv cons 0 local crypto endpoint. : 12.1.1.1, the remote computer supports a cryptographic endpoint. : 12.1.1.2 Path MTU 1500, Medium MTU 1500 current extroverted spinnaker: 3D3 internal ESP gateway: spi: 0x136A010F (325714191) develop: esp-3des esp-md5-hmac, initially with settings = tunnel, Slot: Three, Connection ID: 3442, Stream ID: 1443, Crypto Card: Test see timing: exceptional service life (fps): (4608000/52) Size IV: 8 bytes Read search support: O linked inside sas ah: PCP ingress gateway:PCP ingress gateway:especially outbound gateway: spike: 0x3D3 (979) conversion: esp-3es esp-md5-hmac, in go with settings = tunnel, Slot: 0, Connection ID: 3443, Stream ID: 1444, CryptoMap: Test see time: remaining key life (fps): (4608000/52) Size IV: 8 bytes Read detection support: Yesoutgoing kindness me sas:PCP outbound airlock:
Check firewall policies and routing.Start packet sniffing from the firewall and check the VPN site flow.Activate the local route Firewall Inside to help you access the placement To other networks / servers.Make sure the supporting subnet of the remote PC does not overlap with the local LAN.
The “vpn debug on” command signals the debug mode of VPND, the virtual private network daemon. Debug output is written so that it can be found in $ FWDIR / log / vpnd. elg file. To turn it off, just check: “vpn debug off”:
Go to Diagnostics> Ping.Enter the full IP address on the remote router on the remote subnet that is specified for the tunnel through the host field (for example, 10.5.0.1).Select the appropriate IP protocol, possibly IPv4.
Finally, from the wired client, go to http://dcloud.cisco.com/ to access the Cisco dCloud user interface, and then sign in with any name with your Cisco.com credentials. Use a bandwidth test to make sure that the transport required to connect to the VPN (TCP 443) is definitely not blocked on your world wide web. From a wired client, echo AD1 to 198.18.1.1. 133.1.
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