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MTU/MSS problem with new IOS for C886VA-K9

Hello,

 

I have an C886VA-K9 on ADSl2+ without BNG.

The old firmware was c800-universalk9-mz.SPA.154-1.T1.bin, the new one is c800-universalk9-mz.SPA.159-3.M2.bin

The MTU on Dialer0 is set to 1492, MSS in vlan 1 is set to 1452.

This configurations works with the old firmware, but not with the new one.

With the new firmware IPv4-TLS-handshakes do not work anymore and take infinite.

 

I found a workaround by setting MSS to 1438 in vlan1, this is the only change neccesary to make it work again.

If I boot the old firmware again it works with the old configuration.

 

 

Does somebody know what's faulty here?

 

Kind regards

moma

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