Sophos XG Firewall: How to set the MSS value for remote network(s)

When you have an IPSec site-to-site tunnel established and have periodic traffic drops, even though the tunnel stays up, ping is fine as well as various other small packet services.

The above problem is due to the remote network having trouble supporting a large MSS value.

The following sections are covered:

Applies to the following Sophos products and versions

Sophos Firewall XG Software

The steps required for a workaround until the problem on the remote side is addressed, can only be applied by support. Support will first confirm if you are having the problem related to this article and give the IPSec configuration a quick overview.

Please log a support case and reference this article.

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