Last Modified: Sep 13, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0, 14.1.0.1, 14.1.0.2, 14.1.0.3, 14.1.0.5, 14.1.0.6, 14.1.2, 15.0.0, 15.0.1
Fixed In:
15.1.0, 15.0.1.1, 14.1.2.1, 13.1.3.2, 12.1.5.1
Opened: Apr 16, 2019 Severity: 3-Major
When OneConnect is applied to a virtual server, the server-side packets larger than the client-side MTU may be dropped.
The BIG-IP system rejects server-side ingress packets larger than the client-side MTU, with an ICMP fragmentation needed message. Connections could hang if the server ignores ICMP fragmentation needed and still sends TCP packets with larger size.
-- If the client-side MTU is smaller than server-side (either via Path MTU Discovery (PMTUD), or by manually configuring the client-side VLAN). -- OneConnect is applied. -- proxy-mss is enabled (the default value starting in v12.0.0).
Disable proxy-mss in the configured TCP profile.
OneConnect prevents sending ICMP fragmentation needed messages to servers.