To prevent this you alias the 10.1.1.1 address (cluster address as it is called) on the loopback adapter of the www1 and www2 servers and trick them into to thinking that 10.1.1.1 is a valid address ...
For both PCIe and Ethernet (IEEE 802.3,) signals are getting mighty small. With PCIe 5 reaching 32 Gbps (NRZ at 32 GBaud) and 802.3 reaching 112 Gbps (PAM4 at 56 GBaud), typical eye-mask limits are ...