4 Replies Latest reply on Jun 2, 2010 4:10 AM by orionweb

    best MTU for VOIP over GRE over IPSEC

      We are trying to improve the voice quality of voip calls over VPN (GRE over IPSEC). All ends are SnapGear units either SG530 (soon to be SG560) or a SG580 (runing version 4.0.7 firmware).


      What is the recommended setting to set for VOIP traffic over GRE tunnels where all ends are ADSL links and SHDSL at main site.


      Does this document still apply https://kc.mcafee.com/resources/sites/MCAFEE/content/live/PRODUCT_DOCUMENTATION/ 21000/PD21479/en_US/sg_315_an_voip_d.pdf ?


      Where should one set the MTU, in the ADSL link or in the IPSEC connection (GRE ?)