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ICMP Redirects sent out on wrong VLAN

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TitleICMP Redirects sent out on wrong VLAN
Symptoms
More than one router in a VLAN, each with different reachable remote networks. The end-nodes on this VLAN/subnet will receive ICMP redirect messages to send routed IP packets directly to the router that advertises those remote destinations. In certain configurations it has been seen those ICMP redirects will be sent to hosts on other VLAN(s).
Redirects may also be seen going to edge switches causing routing confusion until the ICMP redirect packet is cleared from switch cache.
Environment
Product: S-series
Firmware: 8.3x
 
Cause
Issue in firmware
Resolution
Upgrade to firmware version 8.42.03.0006/7 or higher
 
Additional notes
The firmware has been modified to check whether the destination IP (DIP) of the redirect is different from the original DIP when the original packet started to be processed. If true then the redirect will not be sent.
 

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