Yan Seiner <yan@xxxxxxxxxx> wrote:
> I have a question on MTU size strategies.
> I have a router that terminates a VPN. The router connects via ppp to
> my ISP. I have a physical interface, with a virtual interface for
> pppoe, and a tun interface for the VPN that runs over the pppoe
> interface.
> The physical interface (eth0) has a MTU of 1500.
> The pppoe interface has an MTU of 1492.
> The vpn interface has an MTU of 1452, a figure I picked somewhat
> arbitrarily, assuming a 40 byte overhead for the vpn.
> My question is then for the other interfaces on the router that face
> the LAN and the DMZ. Should these be set to 1492 or 1500?
If the VPN won't be involved, then 1492 is the best bet.
PMTU is *supposed* to take care of all of this, but...
> And my other question is for the DHCP clients. Should they be set to
> 1492 (and the one host that uses the VPN should be set to 1452)?
The DHCP client should receive 1492 from the server, and set it on the
interface.
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