VPN works, causes periodic freezes of BEFSX41
I use a BEFSX41 as a firewall/router and site to site vpn.
While the vpn tunnel is up the router seems to freeze every minute (sometimes after 45 seconds or 30 seconds.
This is easily evindent when ping the router from another machine on the side of the intranet. While the average ping time is less than 1 milliseconds, every minute it will be 500 milliseconds or more. A ping to a machine on the remote side of the vpn is usually 80 milliseconds and every minute or so it goes up to 2 seoconds for a few pings.
If I take the vpn to the bottom of the judgment of the problem (i.e. ping the router/firewall to the intranet side is consistently below 1 millisecond)
I discovered that these freezes/delays coincides with information in the vpn log file, it looks like this:
2008-12-04 12:46:01 IKE[1] Set up ESP tunnel with 206.xxx.xxx.xx Success !2008-12-04 12:46:012008-12-04 12:46:34 IKE[1] Rx << QM_I1 : 206.xxx.xxx.xx HASH, SA, NONCE, ID, ID2008-12-04 12:46:34 IKE[1] **Check your Local/Remote Secure Group settings !2008-12-04 12:47:012008-12-04 12:47:01 IKE[1] Tx >> MM_I1 : 206.xxx.xxx.xx Error !2008-12-04 12:47:02 IKE[1] Rx << MM_R1 : 206.xxx.xxx.xx SA, VID2008-12-04 12:47:02 IKE[1] ISAKMP SA CKI=[342ed619 c59fed01] CKR=[kkkk1954 ffff4e87]2008-12-04 12:47:02 IKE[1] ISAKMP SA 3DES / MD5 / PreShared / MODP_1024 / 3600 sec (*3600 sec)2008-12-04 12:47:02 IKE[1] Tx >> MM_I2 : 206.xxx.xxx.xx KE, NONCE2008-12-04 12:47:03 IKE[1] Rx << MM_R2 : 206.xxx.xxx.xx KE, NONCE2008-12-04 12:47:03 IKE[1] Tx >> MM_I3 : 206.xxx.xxx.xx ID, HASH2008-12-04 12:47:05 IKE[1] Rx << MM_R3 : 206.xxx.xxx.xx ID, HASH2008-12-04 12:47:05 IKE[1] Rx << QM_R1 : 206.xxx.xxx.xx HASH, SA, NONCE, ID, ID2008-12-04 12:47:05 IKE[1] Tx >> QM_I2 : 206.xxx.xxx.xx HASH2008-12-04 12:47:05 IKE[1] ESP_SA 3DES / MD5 / 3600 sec / SPI=[nnnn7daf:mmmm9ee9]2008-12-04 12:47:05 IKE[1] Set up ESP tunnel with 206.xxx.xxx.xx Success !2008-12-04 12:47:052008-12-04 12:47:32 IKE[1] Rx << QM_I1 : 206.xxx.xxx.xx HASH, SA, NONCE, ID, ID2008-12-04 12:47:32 IKE[1] **Check your Local/Remote Secure Group settings !2008-12-04 12:48:012008-12-04 12:48:01 IKE[1] Tx >> MM_I1 : 206.xxx.xxx.xx Error !2008-12-04 12:48:02 IKE[1] Rx << MM_R1 : 206.xxx.xxx.xx SA, VID2008-12-04 12:48:02 IKE[1] ISAKMP SA CKI=[60e98e30 f5831f66] CKR=[kkkk6675 ffff38d1]2008-12-04 12:48:02 IKE[1] ISAKMP SA 3DES / MD5 / PreShared / MODP_1024 / 3600 sec (*3600 sec)2008-12-04 12:48:02 IKE[1] Tx >> MM_I2 : 206.xxx.xxx.xx KE, NONCE2008-12-04 12:48:03 IKE[1] Rx << MM_R2 : 206.xxx.xxx.xx KE, NONCE2008-12-04 12:48:03 IKE[1] Tx >> MM_I3 : 206.xxx.xxx.xx ID, HASH2008-12-04 12:48:05 IKE[1] Rx << MM_R3 : 206.xxx.xxx.xx ID, HASH2008-12-04 12:48:05 IKE[1] Rx << QM_R1 : 206.xxx.xxx.xx HASH, SA, NONCE, ID, ID2008-12-04 12:48:05 IKE[1] Tx >> QM_I2 : 206.xxx.xxx.xx HASH2008-12-04 12:48:05 IKE[1] ESP_SA 3DES / MD5 / 3600 sec / SPI=[nnnn65e5:mmmm2ea9]2008-12-04 12:48:05 IKE[1] Set up ESP tunnel with 206.xxx.xxx.xx Success !2008-12-04 12:48:05
The situation described above repeats adfinium
To be clear, the vpn works (with the exception of periodic delays) throughout several days
I think that my settings may not completely right, butI don't know how to interpret the log above
Found.
I had disabled PFS. I enabled PFS and the problem disappeared.
http://en.Wikipedia.org/wiki/Perfect_forward_secrecy
See sections 8-10 http://www.ietf.org/rfc/rfc2409.txt to see why
Tags: Linksys Routers
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