Hello net filter Group. We have red hat 9 machine installed squid and nating(port forwarding, for sharing a static ip address with different machines) also. As we have ISDN and DSL line to that machine. We are dialing for isdn through kppp and for DSL line we attached network card to router through Switch. Both inter net connection are working fine with out any problems. If we have some problem to DSL line we are starting ISDN. This set up is working fine for us. But some time we are need to start both for load on DSL line increases. As DSL is running I dialed ISDN it is not working it is noe showing any error , but are not able to browse the internet. Is there any way we use both of them. Nitinmandolkar.