What Is MTU Value Supported by BCC?

At present, the MTU (maximum transmission unit) of private and public ENIs is 1,500 by default. You can run the following command to query current MTU settings:

• linux： Run the command "netstat -i" to query.

• windows: Run the cmd command "netsh interface ip show interface" to query.

If the large file is multipart during the transmission, it may be caused due to the large MTU set value, whose solution is to change the MTU of this ENI to a smaller value. The following takes the interface eth0 as an example to run the command "ip link set dev eth0 mtu xxxx". Where, XXXX is the MTU set value.

How to Create a BCC with public IP?

You need to set the public bandwidth, and the system assigns a public IP for BCC with a bandwidth greater than 0 MB.

Is IP Assigned to Users by BCC Unique?

BCC assigns a unique, independent and fixed IP to users automatically.

Is public IP Fixed?

Yes. You can not specify, select or additionally purchase the BCC IP.

What is Difference Between Public IP and Private IP of BCC?

When the bandwidth traffic of package purchased is greater than zero, BCC assigns an independent public IP and an independent private IP automatically.

• The public IP is used to connect to the public network. If it is necessary to access the BCC application from the public network out of BCC, the public IP is required. The inbound traffic of public IP is not limited, while the outbound traffic is limited by the bandwidth purchased.
• The private IP is used for the access among multiple BCCs in the private network. If there are multiple BCCs under your account, you can use the private IP for the data communication transmission among different BCCs, and the transmission speed of private network is not limited.

Note: BCC has one ENI only, which is bound with the private IP of 192.168.x.x. The public IP is translated to the private IP over the network. Do not change the BCC network settings at will to avoid the BCC connection failure.

If There Is No Public IP, How to Access from Public Network?

At least one BCC should have the public IP in your BCC cluster, and this BCC is used as a transit to connect to other BCCs without public IP.

How to Upgrade the Public Bandwidth?

You can adjust the bandwidth for each EIP instance according to the actual requirements. The bandwidth increase is supported for the prepaid EIP instance, while the bandwidth reduction is not supported. You can adjust the bandwidth for the postpaid EIP instance on the console at any time. For the operation document, see Bandwidth Increase for EIP Instance.

Can Public IP Be Released?

You can release the idle EIP instance to save the rental cost. However, it is not allowed to release the EIP instance in the following three situations:

• Prepaid EIP instance unexpired
• EIP bound with BCC or BLB instance
• EIP suspended due to attack

If you want to release the prepaid EIP instance unexpired, submit the financial ticket to apply for the refund. For the refund details, the ticket processing results shall prevail.

How Can BCC Bind Dual Public IP?

At present, our BCC products support the binding with the cloud ENIC to realize multiple public and private IPs on a BCC. At present, ENIC is in the open beta test stage and can be used on the Application page if necessary. See ENIC Documentation for details.

In addition to the operations on the console, it is not recommended that you modify the IP-related configuration manually. The improper configuration may cause the BCC access failure.

What Is Regional Network Line?

At present, Baidu AI Cloud provides the BGP multi-line access to connect with multiple operator lines, such as China Unicom, China Telecom, China Mobile and CERNET.

Is Bandwidth Exclusive?

Exclusive.

After Creation of BCC, Ca users Change BCC IP Manually? Can BCC Be Bound to Its Public IP?

The BCC public IP is mapped to the BCC private IP after multiple translations. The manual change of BCC network settings causes the BCC access failure. Therefore, it does not supports users to change or add any IP (including public IP and private IP) currently.

If an Internet Service Is Deployed on BCC, Such As Apache and MySQL, How Can Listening Port Bind IP to Release Service?

In general, the BCC instance has a public IP and a private IP. If you want to deploy the Internet service on BCC, the listening port needs to bind with the private IP or 0.0.0.0 to release the service. The client of services on BCC uses the public IP to access the service.

For example, the public IP of a BCC instance is 180.76.135.xxx, the private IP is 192.168.xxx.xxx, and the Apache service is deployed on this BCC instance. The configuration file is as follows:

Listen 0.0.0.0:80 Listen 0.0.0.0:8080

Or: Listen 192.168.xxx.xxx:80 Listen 192.168.xxx.xxx:8080

Open the browser to access the website http: //180.76.135.xxx: 80 after release, and access the page service released on BCC.

How Can BCCs Interconnects with Each Other Under Different Accounts Internally?

BCCs under the same VPC are internally interconnected by default. Different VPCs are completely isolated from each other, and different VPC private networks are not interconnected.
To interconnect with them, you can activate the peering connection service to realize the high-speed interconnection between VPCs. See Peering Connection Documentation.

Why Do Some Ports Not Work Normally?

BCC does not limit the port. You need to check:

1. Do the firewall and security group allow this port?
2. Does the service listen to this port normally?
   If above two conditions are met, the port is in the normal status.

Why Does Network Delay Increase/Intermittent Packet Loss Occurs?

There are many possible reasons for the increase of network delay/packet loss, such as physical circuit failure of network service providers, network ingress/egress fluctuation and different resource nodes accessed. If you find the network failure, you can feed back the IP to Baidu AI Cloud through the ticket for troubleshooting.

How to Deal with Packet Loss When You Ping Website?

You need to ping all public networks to determine whether there is any delay firstly, such as ping baidu.com.

• If you fail to ping other public network address, it should be of your local network or your broadband access provider failure.
• If you ping other public network address successfully, check whether the bandwidth of your BCC is full. If it is not full, you can run the command trace route for the virtual machine IP. It is the commandtraceroute <IP> in the Linux environment and the command tracert tracert <IP> in the Windows environment.

Note: Here, you need to<IP>replace with corresponding IP. You can view the delay or timeout mainly occurs for which IP nodes according to the route trace results, and confirm the ownership of these IPs. Or you can submit a ticket to contact the technical personnel, and upload the output of ping commands traceroute/tracert , and the Baidu technical personnel analyzes the reason.

Why Does Windows Server Browse Webpage Abnormally?

For the BCC's Widnows system is of the server version, the IE enhanced security configuration is enabled by default for security reasons, and you need to add related sites to the list of trusted sites for the normal access. You can also change the "Internet Explorer Enhanced Security Settings" to Off.

• Windows 2008 Server Version: Change "Configure IE ESC" to Off in "Management Tools" - "BCC Manager" -> "BCC Summary" -> "Security Information".
• Windows 2012 Server Version: Change "Internet Explorer Enhanced Security Settings" to Off in "Management Tools" -> "BCC Manager" -> "Local BCC" -> "Attributes".