I have some pb with Vlan and Monowall.
Here is my configuration:
Monowall with 3 lan interfaces using 1.2b8
- Backup server
All interfaces are connected on a cisco switch.
All customers have to be on different subnet and don't have to see each
I use 802.1Q on customers interface.
Ip configuration is /27 for all Vlan interfaces
All Servers are Win2K3.
Customers have to connect using PPTP (@home) and Ipsec (@work).
Config ot the trunk
sh run interface fastEthernet 0/47
description Customers 802.1Q Trunk
switchport trunk encapsulation dot1q
switchport mode trunk
sh int status | i Fa0/47
Fa0/47 Customers 802.1Q T connected trunk A-Full A-100 100BaseTX/FX
For the test, all rules are "accept" between all interfaces. I have 2
W2K3 on 2 differents interfaces.
Both servers are able to ping each other. But when I try do use rdp from
one interface to another, it doesn't work, even if I use "Allow
fragmented packets". I also tried with PPTP.
I finally sorted out using an MTU of 1468 on the win2K3 srv.
I thought that is was the end but into the Ipsec tunnel unable to use rdp.
I changed the MTU from 1468 to 1400 and it's seems to work this way.
The problem seems to be located only on Giga Intel card. I tried with an
Via ethernet card and no problem...
FYI, I also test this configuration without vlan and only physical
interface with default MTU value and all is ok.
How can I be sure that the 1400 value for the Mtu will be the good one ?