How to find DNS servers for each PPP session in linux? [closed]

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How to get the DNS server address which are specific to each ppp session. For example, I have to ppp sessions each one connected different service provider, how do I find out the DNS server IP address which are assigned by each service provider? In general, the /etc/ppp/resolv.conf file will be overwritten with the new DNS IP address whenever a new ppp 开发者_如何学运维session is established. Is there any way how we can maintain separate files for DNS servers for each service provider?

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ppp comes with scripts to update resolv.conf for you. Look at /etc/ppp/ip-up and /etc/ppp/ip-up.d/0dns-up. The last one has the rules for updating the resolv.conf file. ($DNS1 and $DNS2 variables).

You can add an ip-up.d script if you want.