Re: question about microsoft vpn or alternatives

[Ivan Hernandez <ivan.hernandez () globalsis com ar>]

PPTP uses the GRE Protocol (IP Protocol number 47) and i have found that 
some NAT's does not route it as it does not know what it is. You can of 
course turn to IPSec, wich is widely known now, and will get you better 
support.
That's my 2 cent's
Ivan Hernandez

Johnny Tam wrote:

> Hello all
> I have a windows 2000 server configured for
> VPN (PPTP) and Terminal Services App Mode.
> Everything is working on the server and there has
> been no problem with ports being blocked, etc since
> it is directly connected to the internet.
>
> I have a remote client that cannot connect to
> the vpn server. It only goes until Verifying
> Password and then just gives out an error 721.
>
> From my initial testing on why this "could"
> happen. I found out that the client is not
> directly connected to the internet although he
> has a real IP 10.xxx.xxx.xxx. By that,
> I mean he goes through at least one or two
> nodes up him that could possibly filter a lot
> of ports. Even ICMP (ping) inbound and outbound
> is prohibited, you just get a request timed out
> all the time but internet surfing etc is working ok.
> If you do a traceroute from tracert, it would
> end up until
> 15  zzz.CUSTOMER.DSL.ALTER.NET (66.66.66.66)  233.526
> ms  235.943 ms  239.454 ms
> 16  * * *
> 17  * * *
> 18  * * *
>
> (ip modified for privacy)
>
> If I request those nodes above him to allow
> ICMP, would that help? or NAT problem?
>
> Are there any alternative VPN solution I can
> use that won't have this kind of problem?
> How is Cisco's implementation of VPN? 
>
> Thank you for any helpful information
>
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