Categories
Changes

Network Core MTU Increase

We’re making changes in our network core by changing the MTU to 9216 (from 9000). We don’t anticipate any impact, but as always, contact us if anything seems odd. 9216 is the lowest common denominator MTU across our various routers.

Colocation customers taking advantage of jumbo frame support should continue to use an MTU of 9000 for Ethernet interfaces connected to our infrastructure.

Categories
Changes

DNSBL Shutdown: NJABL

Effective immediately, Rollernet will discontinue use of the dnsbl.njabl.org DNSBL zone due to its shutdown. We’re also removing it from all custom settings.

Source: http://www.njabl.org/

March 1, 2013: NJABL is in the process of being shut down. The DNSBL zones have been emptied. After “the Internet” has had some time to remove NJABL from server configs, the NS’s will be pointed off into unallocated space to hopefully make the shutdown obvious to those who were slower to notice.

 

Categories
Changes

Mail: New Signature Databases

We’ve added the “blurl” and “phishtank” databases to our ClamAV third party databases. For more information see sanesecurity.com (we also donate an rsync mirror to the project).

Categories
Changes

Mail: SpamAssassin Custom Subject Tag

A new option to customize the subject tag for the SpamAssassin content filter has been added. The default is still “** SPAM:”, but this tag can now be customized with a limited set of ASCII values. These options are now referred to as “subject tagging” whereas they were previously called “subject prepending”.

Categories
Changes

Mail: ClamAV Tagging Mode

The ClamAV antivirus filter now has an optional tagging mode which will insert the header “X-Rollernet-ClamAV” if a signature match is found. The behavior of the “reject on match” mode is unchanged.

As part of this we’ve added two new rules to SpamAssassin for scoring based on the presence of this header: ROLLERNET_CLAMAV (default score of 10 for matches) or ROLLERNET_CLAMAV_3RDPARTY (default score of 4 for ignored third party matches).