在/var/log/maillog中發現下列錯誤訊息：
Nov 27 08:29:05 dns dccproc[2665]: no working DCC servers dcc1.dcc-servers.net dcc2.dcc-servers.net dcc3.dcc-servers.net ... at 127.0.0.1
執行dcc相關指令進行除錯
執行後產生一堆undefined name or wrong IP version錯誤訊息
[root@dns log]# cdcc info
# 11/27/13 10:11:38 CST /var/dcc/map
# Re-resolve names after 10:29:05
# 1 total, 0 working servers
# continue not asking DCC server 31 seconds after 1 failures
IPv6 on version=3
dcc1.dcc-servers.net,- RTT+1000 ms anon
# undefined name or wrong IP version
dcc2.dcc-servers.net,- RTT+1000 ms anon
# undefined name or wrong IP version
dcc3.dcc-servers.net,- RTT+1000 ms anon
# undefined name or wrong IP version
dcc4.dcc-servers.net,- RTT+1000 ms anon
# undefined name or wrong IP version
dcc5.dcc-servers.net,- RTT+1000 ms anon
# undefined name or wrong IP version
@,- RTT-1000 ms 32768 secret13007803165y958
# *127.0.0.1,-
# not answering
################
# 11/27/13 10:11:38 CST greylist /var/dcc/map
# Re-resolve names after 12:06:31
# 1 total, 0 working servers
# continue not asking greylist server 32 seconds after 1 failures
@,- Greylist 32768 secret13007803165y958
# *127.0.0.1,6276
# not answering
[root@dns log]#
試著執行下列指令，看能不能解決：
[root@dns log]# cdcc rtt
# 11/27/13 10:15:58 CST /var/dcc/map
# Re-resolve names after 12:15:52 Check RTTs after 10:30:57
# 1432.88 ms threshold, 1381.41 ms average 12 total, 11 working servers
IPv6 on version=3
dcc1.dcc-servers.net,- RTT+1000 ms anon
# 74.92.232.243,- Etherboy ID 1002
# 100% of 1 requests ok 358.04+1000 ms RTT 100 ms queue wait
# 80.91.36.101,- dcc1.aftenposten.no ID 1215
# 100% of 3 requests ok 1643.84+1000 ms RTT 100 ms queue wait
# 209.169.14.30,- x.dcc-servers ID 104
# 100% of 1 requests ok 332.88+1000 ms RTT 100 ms queue wait
dcc2.dcc-servers.net,- RTT+1000 ms anon
# 192.84.137.21,- INFN-TO ID 1233
# 100% of 1 requests ok 436.34+1000 ms RTT 100 ms queue wait
# 195.20.8.232,- EATSERVER ID 1166
# 100% of 1 requests ok 419.84+1000 ms RTT 100 ms queue wait
dcc3.dcc-servers.net,- RTT+1000 ms anon
# 38.124.232.176,- ID 1102
# 100% of 1 requests ok 349.92+1000 ms RTT 100 ms queue wait
# 192.135.10.194,- debian ID 1169
# 100% of 2 requests ok 1460.40+1000 ms RTT 1100 ms queue wait
dcc4.dcc-servers.net,- RTT+1000 ms anon
# *69.12.221.230,- sonic.net ID 1117
# 100% of 1 requests ok 281.41+1000 ms RTT 100 ms queue wait
# 137.208.8.63,- wuwien ID 1290
# 100% of 1 requests ok 438.02+1000 ms RTT 100 ms queue wait
dcc5.dcc-servers.net,- RTT+1000 ms anon
# 136.199.199.160,- URT ID 1060
# 100% of 1 requests ok 433.91+1000 ms RTT 100 ms queue wait
# 194.119.212.6,- dcc1 ID 1182
# 100% of 2 requests ok 467.66+1000 ms RTT 100 ms queue wait
@,- RTT-1000 ms 32768 secret13007803165y958
# 127.0.0.1,-
# not answering
################
# 11/27/13 10:15:58 CST greylist /var/dcc/map
# Re-resolve names after 12:15:57
# 1 total, 0 working servers
# continue not asking greylist server 32 seconds after 1 failures
@,- Greylist 32768 secret13007803165y958
# *127.0.0.1,6276
# not answering
[root@dns log]#
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