@@ -134,13 +134,12 @@ Destination address |
ipv4_addr
|======================
-Careful with matching on *ip length*: If GRO/GSO is enabled, then the Linux
-kernel might aggregate several packets into one big packet that is larger than
-MTU. Moreover, if GRO/GSO maximum size is larger than 65535 (see man ip-link(8),
-specifically gro_ipv6_max_size and gso_ipv6_max_size), then *ip length* might
-be 0 for such jumbo packets. *meta length* allows you to match on the packet
-length including the IP header size. If you want to perform heuristics on the
-*ip length* field, then disable GRO/GSO.
+Careful with matching on *ip length*: The Linux kernel might aggregate several
+packets into one big packet that is larger than MTU. Moreover, if GRO/GSO
+maximum size is larger than 65535 (see man ip-link(8), specifically
+gro_ipv6_max_size and gso_ipv6_max_size), then *ip length* might be 0 for such
+jumbo packets. *meta length* allows you to match on the packet length including
+the IP header size.
ICMP HEADER EXPRESSION
~~~~~~~~~~~~~~~~~~~~~~
The kernel can form aggregate packets whether or not GSO is enabled. Disabling GSO is not a useful suggestion in this case. Fixes: 05628cdd677d (doc: describe behaviour of {ip,ip6} length) --- doc/payload-expression.txt | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)