Can I/How to change the TTL value of IP packet

[fore]

Hi everyone. I have this particular problem. Got 2 komputers at home. First is running WinXP SP2. It has 2 LAN Cards. One for cable(100Mbps Ehternet) internet and other for home connection with second komputer. Other computer is running again WinXP SP2, but has diferent hardware.I have enabled the ICS on first, sets the "home lan" and everything works fine. Before a couple days second computer had lost the internet conectivity. Actually it has connectoin with other computer, pinging OK, having shared printer and files, but don't have internet access.
I noticed that the ping reply from any site(pinging from 1st computer) aways comes whit TTL=1. So that is why any packet can't reach the second computer. This is doing by my ISP, so i can't share mi Internet Connection.
My questin is:
If i install WinGate service ot my first computer, is there any tool in this software helps me to manipulate na TTL value(for example from TTL=1 to TTL=2 or any bigger than 1) to get internet on my second computer?
10x

[adrien]

Hi

I think there is a setting in the registry for XP TCP/IP that can set the start TTL of outbound packets. However, for incoming packets to always have a TTL of 1 is very odd. It is more likely to be ICS doing that (I really don't know)

If you disable ICS, do you still get a TTL of 1 on these packets?

WinGate doesn't allow you to set TTL, it reduces TTL by 1 every time it forwards a packet.

Adrien

[bigman]

I have exactly the same problem - incoming packets have a TTL value of 1 and they cannot be forwarded.
My ISP changed the TTL value recently and I guess this has been done on purpose.
Is there anything I can do so that incoming packets can reach other computers?

[adrien]

Hi

Our NAT reduces TTL by one, so NAT traffic I don't think would work in such scenarios.

However, proxy traffic should work fine, including intercepted traffic.

I guess we could add an option to not reduce TTL for NAT, or to even set it to some value.

Does your ISP say why they do this? Do you have a choice of which ISP to use?

Adrien