public Builder clearIpProtocol() {
      ipProtocol_ = getDefaultInstance().getIpProtocol();
      bitField0_ = (bitField0_ & ~0x00000040);
      onChanged();
      return this;
    }
<pre>
The IP protocol to which the external access rule applies. This value can
be one of the following three protocol strings (not case-sensitive):
`tcp`, `udp`, or `icmp`.
</pre>

<code>string ip_protocol = 8;</code>

@return This builder for chaining.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/ExternalAccessRule.java