Symantec Network Security 2 In-line Bypass Unit (037648246101) Network Management Device Recommendations

Since in-line mode by definition places the appliance into the network path, a hardware or software failure affecting the interface pair will interrupt network traffic, or fail closed. To avoid this you can install the In-line Bypass unit. The bypass unit monitors the 7100 Series status, and if it senses a failure, the bypass unit provides direct network connectivity.