4 ms·

I think you are confusing the IP header with TCP header. Routers don’t touch the TCP header at all

• Avery3R 6y ago
  if your router does NAT it touches the tcp header
  • noncoml 6y ago
    You are right, although NAT could be classified as a firewall feature, that runs on routers. But in any case it's irrelevant in this context as ATT shouldn't be doing any NAT
• ericbarrett 6y ago
  No. URG, “Christmas tree” packets, etc. all can be mangled by the ISP. Or more commonly dropped
  • deleted 6y ago
    [deleted]