Slow ICS performance

We have some performance issues with our computer that shares our
Internet connection.

Schematics:


Internet - ADSL - Windows 2003 Server - LAN clients (1.1.1.x)


The server is sharing the connection with ICS and is firewalled to the
Internet (the built in firewall). The clients uses the server's LAN NIC

IP address as gateway and DNS address.


The speed from the server (Win2k3 server) to the internet is good, and
web browsing and downloading is ok from the clients, but gaming is
another story. There are noticeable lag in games and it constantly
drops the connection. I also noticed some differencies in speed when
checking e-mail from the clients when going from Win2k3 -> WinXP (one
client has multiple POP3/SMTP-accounts)


I tried connecting one client directly to the LAN NIC of the server,
same issues.
Tried connect the client directly to the ADLS modem, no issues anymore.

Tried re-installing the server and not using DNS, DHCP or WINS, which
was used before, still the same issues.
When I put a WindowsXP system in the server's position as a Internet
sharer these issues does not show up.


So: How should the ICS thing be done correctly? Any other alternatives?

(I need DHCP and WINS, that's why I don't keep the Windows XP as the
server OS)

There are problems using ICS and a local DNS/DHCP server. ICS assumes
that it is acting as a DNS proxy and as a DHCP-style allocator.

The alternative is to use RRAS/NAT instead of ICS. The RRAS setup wizard
will configure this for you. If you leave it at the default settings it will
not try to act as a DNS proxy or DHCP allocator. It will just do NAT.

Set DHCP to hand out the server's LAN IP for gateway and DNS addresses.
Modify your local DNS to forward to a public DNS (such as your ISP).


(E-Mail Removed) wrote:
> We have some performance issues with our computer that shares our
> Internet connection.
>
> Schematics:
>
>
> Internet - ADSL - Windows 2003 Server - LAN clients (1.1.1.x)
>
>
> The server is sharing the connection with ICS and is firewalled to the
> Internet (the built in firewall). The clients uses the server's LAN
> NIC
>
> IP address as gateway and DNS address.
>
>
> The speed from the server (Win2k3 server) to the internet is good, and
> web browsing and downloading is ok from the clients, but gaming is
> another story. There are noticeable lag in games and it constantly
> drops the connection. I also noticed some differencies in speed when
> checking e-mail from the clients when going from Win2k3 -> WinXP (one
> client has multiple POP3/SMTP-accounts)
>
>
> I tried connecting one client directly to the LAN NIC of the server,
> same issues.
> Tried connect the client directly to the ADLS modem, no issues
> anymore.
>
> Tried re-installing the server and not using DNS, DHCP or WINS, which
> was used before, still the same issues.
> When I put a WindowsXP system in the server's position as a Internet
> sharer these issues does not show up.
>
>
> So: How should the ICS thing be done correctly? Any other
> alternatives?
>
> (I need DHCP and WINS, that's why I don't keep the Windows XP as the
> server OS)