Re: [Openvpn-users] ADSL->ADSL OpenVPN, what MTU? 1492?

[Nathan Barham <nathan@xxxxxxxxxxxxxx>]

Gregory G Carter wrote:

> I have the following rules in place on all my firewalls:
>
> iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
> iptables -A INPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT
> iptables -A FORWARD -p icmp --icmp-type fragmentation-needed -j ACCEPT
>
> If there is some other icmp type related to mtu path discovery I am 
> missing, perhaps someone could point it out???

AFAIK Destination Unreachable (icmp type 3) is important for path MTU 
discovery as well.


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