While many organizations implement routing and security today, these two technologies perform conflicting functions: routing facilitates network access while firewalls—to an extent—prevent access. IPSec VPNs enable private communications over the Internet through data encryption. But IPSec VPNs do not support a standard method of exchanging route information over encrypted tunnels. Organizations have developed strategies to overcome the opposing goals of routing and security, such as managing more and more single-purpose appliances and configuring complicated rules to support routing across firewalls and VPNs. However, these imperfect solutions do not scale to meet the needs of increasingly complex distributed networks.
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