update: nat gw ping

docs/guide/vpc.en.md

@@ -229,6 +229,10 @@ Other configurable parameters:
 - `tolerations`: Configure tolerance for the VPC gateway. For details, see [Taints and Tolerations](https://kubernetes.io/docs/concepts/scheduling-eviction/taint-and-toleration/#taint-nodes-by-condition)
 - `affinity`: Configure affinity for the Pod or node of the VPC gateway. For details, see [Assigning Pods to Nodes](https://kubernetes.io/docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity)
 
+Things to note when using VPC-NAT-GW:
+
+1. After the nat gw pod is created, the nic net1 arp is disabled and the physical gateway cannot be pinged. After creating the eip, the arp will be automatically enabled and the ping to underlay gateway should be ok.
+
 ### Create EIP
 
 EIP allows for floating IP, SNAT, and DNAT operations after assigning an IP from an external network segment to a VPC gateway.

docs/guide/vpc.md

@@ -225,6 +225,10 @@ spec:
 - `tolerations` : 为 VPC 网关配置容忍度，具体配置参考 [污点和容忍度](https://kubernetes.io/zh-cn/docs/concepts/scheduling-eviction/taint-and-toleration/)。
 - `affinity` :  为 VPC 网关 Pod 或节点配置亲和性，具体设置参考 [亲和性与反亲和性](https://kubernetes.io/zh-cn/docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity)。
 
+在使用 VPC-NAT-GW 时需要注意：
+
+1. nat gw pod 创建之后，net1 arp 是关闭的，ping 不通物理网关，创建 eip 后会自动打开 arp，可以 ping 通。
+
 ### 创建 EIP
 
 EIP 为外部网络段的某个 IP 分配给 VPC 网关后可进行 DNAT，SNAT 和浮动 IP 操作。