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IPSec over GRE with SPI Problems

I am using IPSec and I am getting this error, it is a connection over a satellite link and its IPSec within two other encryption encapsulations (external hardware), there are known MTU issues here - but that should cause the errors below -

anyone any ideas ? Its resulting is Eigrp nei being reset and causing major onsite disruption.

Jun 23 12:11:46: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=1X.X.X.X, prot=51, spi=0xB0B196D6(2964428502), srcaddr=1X.X.X.X
Jun 23 12:18:32: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=1X.X.X.X, prot=51, spi=0x20F588B7(552962231), srcaddr=1X.X.X.X
Jun 23 12:23:21: %CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPSEC packet has invalid spi for destaddr=1X.X.X.X, prot=51, spi=0x5F707868(1601206376), srcaddr=1X.X.X.X

1 REPLY

Re: IPSec over GRE with SPI Problems

Are you doing a nat in any of the endpoints?

It seems that there is a problem with the interesting traffic. Check that first. And attach the config if possible.

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