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Cisco Bug: CSCuj35691 - CGSE+ XLP padding 2B extra to TCP/UDP pkt under 42B on checksum recalcul

Last Modified

Jan 10, 2017

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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