I recently ran into an issue where we changed a port link from the ISP from access to tagged to allow us to receive another vlan handed from them.
When we first attempted to do this I was getting about 50-80% packet loss (ie: 3 pass, 1 fails, 2 pass, 4 fail, 3 pass)
Because they were unable to help we changed it back.
Yesterday we made the change again and pings were fine, traceroutes worked fine, I could ssh in and out of the link, I can even telnet to port 80 and 443 and get pages. However when anyone types an ip in their browser it never gets anywhere.
I ruled out the router by connecting my laptop directly and still had the issue. I even tried another switch. Nothing worked.
They're extremely unhelpful and deny theres any issue on their end.
Can anyone give me any insight to what could cause this?