How much salary we can expect for 15yrs experience in Network operations Domain? Currently 25.5L fixed salary..

Depends on company. I know folks in us product based company making over 90 base+ 15bonus+ 20 stocks .

I think you need to switch, not to Infosys, TCS, Capgemini, etc.

Can you please share your skills? Have you found any niche skills to be learned in your domain? It would be much helpful for a friend of mine.