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Cisco Bug: CSCuj90438 - CGSE+ XLP tampering L3 length when L2 layer is padded

Last Modified

Feb 12, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

4.3.2.BASE

Description (partial)

Symptom:TCP and UDP packets smaller than 42 bytes will get padded to become 42 byte packets post NAT. The Total length field of the IP header is modified and this may cause some applications to break
Conditions:TCP or UDP packets with IP total length of less than 42 bytes are NATed using CGSE-PLUS
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