socket options = TCP_NODELAY SO_RCVBUF=65536
SO_SNDBUF=65536
read raw = yes
write raw = yes
max xmit = 65535
dead time = 15
min receivefile size = 16384
write cache size = 524288
getwd cache = yes
max connections = 65535
max open files = 65535
min protocol = smb3
max protocol = smb3
I'm assuming they're plain text. There's is no perceivable way they can only use those data points to to figure out which hash it is. Unless of course they're using their own "hashing" function which isn't secure at all since it's probably reversible.
I use a mikrotik RB5009 for my 2.5gb routing. It technically can hit 10gbps via routing.
Switching you can try https://mikrotik.com/product/crs305_1g_4s_in