I was just asked about something not too different, involving IIRC
tnsping. It got me to looking at ip_sysctl.txt which has:
icmp_ratelimit - INTEGER
Limit the maximal rates for sending ICMP packets whose type
matches icmp_ratemask (see below) to specific targets.
0 to disable any limiting, otherwise the maximal rate in
jiffies(1)
Default: 100
icmp_ratemask - INTEGER
Mask made of ICMP types for which rates are being limited.
Significant bits: IHGFEDCBA9876543210
Default mask: 0000001100000011000 (6168)
Bit definitions (see include/linux/icmp.h):
0 Echo Reply
3 Destination Unreachable *
4 Source Quench *
5 Redirect
8 Echo Request
B Time Exceeded *
C Parameter Problem *
D Timestamp Request
E Timestamp Reply
F Info Request
G Info Reply
H Address Mask Request
I Address Mask Reply
* These are rate limited by default (see default mask above)
(I've always been used to masks being specified as hex values)
rick jones
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