Can the TLL value in returned ping packets be modified on the AR router

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The TTL value in response ping packets cannot be modified, and the TTL in sent ping packets can be changed by running the ping -h < ttl-value > command in any view.

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Can the TLL value in returned ping packets be modified on the AR router
The TTL value in response ping packets cannot be modified, and the TTL in sent ping packets can be changed by running the ping -h < ttl-value > command in any view.

Fast ICMP reply function on S series switches
After receiving an ICMP Request packet, an S series switch (a non-S1700 switch) does not send it to the ICMP protocol stack but directly exchanges the source and destination MAC addresses of the packet and responds with an ICMP Relay message. This process is called fast ICMP reply. (The switch can successfully ping another device even if it does not have a return route or an ARP entry.) A switch cannot accurately calculate the delay or jitter of ping packets that require high real-time performance. The reason is that the protocol stack adds the sending and receiving timestamps to ping packets. The packets need to enter queues frequently between the protocol stack and the hardware. Therefore, the real-time performance of timestamps cannot be ensured. In versions earlier than V100R006, fast ICMP reply is a common task. When a switch processes a large number of services, the reply delay is long due to service switching. In V100R006 and later versions, fast ICMP reply is a super task with a high priority. In most cases, the relay delay is about 1 ms. The actual delay depends on the CPU usage and is shorter than 100 ms. The icmp-reply fast command enables the fast ICMP reply function. Note: The fast ICMP reply function is disabled on modular switches running all versions by default.

Can the GTL license file of the AR router be manually modified
The GTL license file is encrypted. Once it is being manually modified, it cannot be used any more.

An AR router does not respond to a Tracert command, but can be pinged
By default, the function of responding to a Tracert request is not enabled on the AR router. Run the icmp port-unreachable command in the system view. Run a send command to enable the packet transmission function for the ICMP interfaces.

How to check ping packet loss on S series switches
For S series switches (except the S1700), you can run the ping command to check ping packet loss directly. For example: [HUAWEI] ping -c 100 192.168.2.21 PING 192.168.2.21: 56 data bytes, press CTRL_C to break Reply from 192.168.2.21: bytes=56 Sequence=1 ttl=124 time=1 ms ... --- 192.168.2.21 ping statistics --- 100 packet(s) transmitted //Total number of sent packets 91 packet(s) received //Total number of received packets 9.00% packet loss //Packet loss ratio round-trip min/avg/max = 1/1/19 ms You can also perform the following steps to configure traffic statistics collection to check ping packet loss: Configure traffic statistics collection for packets received by a switch. 1. Configure an ACL rule. [HUAWEI] acl number 3000 [HUAWEI-acl-adv-3000] rule permit icmp source 192.168.2.21 0 destination 192.168.2.20 0 [HUAWEI-acl-adv-3000] quit 2. Configure a traffic classifier. [HUAWEI] traffic classifier 3000 [HUAWEI-classifier-3000] if-match acl 3000 [HUAWEI-classifier-3000] quit3. Configure a traffic behavior. [HUAWEI] traffic behavior 3000 [HUAWEI-behavior-3000] statistic enable [HUAWEI-behavior-3000] quit 4. Configure a traffic policy. [HUAWEI] traffic policy 3000 [HUAWEI-trafficpolicy-3000] classifier 3000 behavior 3000 [HUAWEI-trafficpolicy-3000] quit 5. Apply the traffic policy to an interface. [HUAWEI] interface gigabitethernet 0/0/2 [HUAWEI-GigabitEthernet0/0/2] traffic-policy 3000 inbound [HUAWEI-GigabitEthernet0/0/2] quit 6. Check traffic statistics of packets received by the switch. [HUAWEI] display traffic policy statistics interface gigabitethernet 0/0/2 inbound verbose rule-base //The output is omitted. For more information about ping packet loss, see "Ping Failure Troubleshooting" or "S Series Switches packet Loss Troubleshooting" in "Maintenance Topics" in the Huawei S Series Campus Switches Maintenance Guide.

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