Hỏi về thông báo Source Quench received

[hoangtulsn]

Các bro cho em hỏi thông báo Source Quench received khi ping đến ip của 1 modem thì có thông báo như sau :

Mạng cơ quan em firewall là PIX 525 2 SW layer3 và khoảng 6 sw layer 2 còn lại là CE 500





vs lại khi các máy trạm vào web có con virus này



là kêt nối đến Firewall để đi ra ngoài time nhấp nhổm bình thường time <1ms nhưng mấy hum nay có con này time đều đều 20 ms , 30 ms . Mong các bro giúp đỡ

[hoanggialiem]

Using the Internet Control Message Protocol (ICMP), a source quench is a message from one host computer to another telling it to reduce the pace at which it is sending packet to that host. The source quench is one of several ways to manage the flow of packets on the Internet. Ideally, a receiving host would detect when packets were stacking up too fast and send a source quench in time to slow the pace down so that no packets were lost. Note that the Internet Protocol (IP) of which ICMP is a part does not itself guarantee the delivery of packets. Higher-level protocol, such as the Transport Control Protocol (TCP), have responsibility for ensuring successful end-to-end communication. IP and ICMP simply report errors or situations as they are detected so that packets can be resent or sent at a different pace. Source quench is not the only way to control flow in a network and not necessarily the most efficient way. In IP Version 4, the most commonly-used IP version, routers are not allowed to originate a source quench and are not obligated to act on a received source quench. Because the source quench message may itself increase network traffic, other approaches to network flow control are preferred.

[luancb]

Error Message:
Source quench received.

Explanation:

The flow control mechanism in IP is the Internet Control Message Protocol (ICMP) Source Quench message. In effect, when IP packets arrive too quickly for a node to handle, it can send a Source Quench message, which essentially tells the source of the packets to back off. This message should not be considered a problem.