I've noticed some weird entries in redis, as in the following (10.2.17.142 is 
one of the addresses that frequently doesn't get properly reverse-looked-up on 
our install):

redis 127.0.0.1:6379> keys *10.2.17.142*
 1) "dns.cache.BY 10.2.17.142.client.62 300\r\n"
 2) "dns.cache.BY 10.2.17.142.client8.206 300\r\n"
 3) "dns.cache.BY 10.2.17.142.client.client 0 -10\r\n"
 4) "dns.cache.BY 10.2.17.142.client2.client 0 -10\r\n"
 5) "dns.cache.BY 10.2.17.142.client\n"
 6) "10.2.17.142.client"
 7) "dns.cache.BY 10.2.17.142.client 1.000000 10.2.17.14\r\n10\r\n"
 8) "dns.cache.RBY 10.2.17.142.client.132 300\r\n"
 9) "dns.cache.BY 10.2.17.142.client 1.000000 10.2.17.113\r\n11\r\n"
10) "dns.cache.BY 10.2.17.142.client 1.000000 67.217.177.157\r\n14\r\n"
11) "dns.cache.BY 10.2.17.142.client08 300\r\n"
12) "dns.cache.BY 10.2.17.142.client9.server 0 -10\r\n"
13) "dns.cache.BY 10.2.17.142.client7.136 300\r\n"
14) "dns.cache.BY 10.2.17.142.client 1.000000 204.93.223.143\r\n14\r\n"
15) "dns.cache.BY 10.2.17.142.client 1.00000"
16) "dns.cache.BY 10.2.17.142.client.26 300\r\n"
17) "dns.cache.BY 10.2.17.142.client9.client 0 -10\r\n"
18) "dns.cache.BY 10.2.17.142.client\r\n"
19) "dns.cache.BY 10.2.17.142.client"
20) "dns.cache.BY 10.2.17.142.client 1.000000 69.60.176.6220\r\n14\r\n"
21) "dns.cache.BY 10.2.17.142.client8.server 0 -10\r\n"
22) "dns.cache.BY 10.2.17.142.client9.102 300\r\n"
23) "dns.cache.BY 10.2.17.142.client.server 0 -10\r\n"
24) "dns.cache.BY 10.2.17.142.clientclient 0 -10\r\n"
25) "dns.cache.BY 10.2.17.142.client.210 300\r\n"
26) "dns.cache.BY 10.2.17.142.client6.122 300\r\n"
27) "dns.cache.BY 10.2.17.142.client 1.000000 54.24"
28) "10.2.17.142.server"

Is a string not getting null-terminated or something that is creating all those 
strange entries?

Thanks &
Cheers,

Toby
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