[Swan] Kernel does not support NIC esp-hw-offload

Paul Wouters paul at nohats.ca
Mon Jun 17 16:42:17 UTC 2019

On Mon, 17 Jun 2019, Kaushal Shriyan wrote:

> I am seeing the below error when i am installing libreswan-3.29-1.el7.x86_64 on CentOS Linux release 7.6.1810 (Core)
> 64-bit architecture.
>       Jun 17 06:55:37.799835: ERROR: can't offload to eth0 because SIOCETHTOOL ETHTOOL_GSSET_INFO failed. Errno
>       95: Operation not supported
>       Jun 17 06:55:37.799844: Kernel does not support NIC esp-hw-offload

Did you change the option nic-offload= from its default "auto" to "yes" ?

With set to auto, it should not cause any failure.

Another issue could be that the ethtool code is too old and this error
should really just be a debug warning.

Regardless, if the connection works, and you are not expecting to be
using special nic's with hardware offload support, you can ignore
this message.


More information about the Swan mailing list