Errata

Regarding the following RPM configs on the top of page 413:

probe-count 7;
probe-interval 3;

The text on page 412 reads, "Seven probes should be sent every three seconds". The commands shown in the book (seen above) do not accomplish what the text is indicating. From what my testing shows, these configs actually indicate that a total of 7 probes will be sent with a 3 seconds pause between each probe -- so, there would be 7 probes over a 21 second time period, not 21 probes over a 9 second period as the text is suggesting.

Here is the output of my verification:

Configs:
root@srxA-1# show services
rpm {
probe foo {
test Porter {
probe-type icmp-ping;
target address 172.20.77.2;
probe-count 7;
probe-interval 3;
test-interval 30;
}
}
}


Results (7 total ICMP echo packets with 3 seconds between echo):

02:47:05.337802 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 0, length 8
02:47:05.339314 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 0, length 8
02:47:08.384199 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 1, length 8
02:47:08.385854 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 1, length 8
02:47:11.430300 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 2, length 8
02:47:11.437512 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 2, length 8
02:47:14.476515 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 3, length 8
02:47:14.483775 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 3, length 8
02:47:17.522808 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 4, length 8
02:47:17.524394 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 4, length 8
02:47:20.532636 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 5, length 8
02:47:20.534167 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 5, length 8
02:47:23.580873 Out IP 172.20.77.1 > 172.20.77.2: ICMP echo request, id 5413, seq 6, length 8
02:47:23.582165 In IP 172.20.77.2 > 172.20.77.1: ICMP echo reply, id 5413, seq 6, length 8

Regards,

These are the last few lines of the section "Static IGMP membership". It lists all the multicast IPs with the first octet as 225 while it should have been 224. For example, 225.0.0.5 and 225.0.0.6 should have been 224.0.0.5 and 224.0.0.6.

Page 570, Figure 10-2 [March 2008, First edition].

Under LAN 2, the second receiver ins interested in receiving multicast traffic for Group G1 as indicated in the figure, but then it is doing a
Join G2 instead of Join G1.

Similarly, the third received on LAN 2 is interested in G2, but it is
doing a Join G1 instead of Jojn G2.

Both the above seems to be a typo. Not sure if this was
corrected in the latest edition.

Regards
Jayesh