HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Command Referen - Page 148
ip ttl-expires enable, ip unreachables enable
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ip ttl-expires enable Use ip ttl-expires enable to enable sending ICMP time-exceeded packets. Use undo ip ttl-expires enable to disable sending ICMP time-exceeded packets. Syntax ip ttl-expires enable undo ip ttl-expires enable Default Sending ICMP time-exceeded packets is disabled. Views System view Predefined user roles network-admin Usage guidelines A device sends ICMP time-exceeded packets by following these rules: • If a received packet is not destined for the device and the TTL field of the packet is 1, the device sends an ICMP "TTL expired in transit" packet to the source. • When the device receives the first fragment of an IP datagram destined for the device itself, it starts a timer. If the timer expires before all the fragments of the datagram are received, the device sends an ICMP "fragment reassembly timeout" packet to the source. A device disabled from sending ICMP time-exceeded packets does not send ICMP "TTL expired" packets but can still send ICMP "fragment reassembly timeout" packets. Examples # Enable sending ICMP time-exceeded packets. system-view [Sysname] ip ttl-expires enable ip unreachables enable Use ip unreachables enable to enable sending ICMP destination unreachable packets. Use undo ip unreachables enable to disable sending ICMP destination unreachable packets. Syntax ip unreachables enable undo ip unreachables enable Default Sending ICMP destination unreachable packets is disabled. Views System view 140