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[master] shorten default servfail-ttl

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4239.	[func]		Changed default servfail-ttl value to 1 second from 10.
			Also, the maximum value is now 30 instead of 300. [RT #37556]
This commit is contained in:
Evan Hunt
2015-10-17 13:44:01 -07:00
parent ffafab1328
commit 90174e64f4
5 changed files with 11 additions and 8 deletions
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3
CHANGES
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@@ -1,3 +1,6 @@
4239. [func] Changed default servfail-ttl value to 1 second from 10.
Also, the maximum value is now 30 instead of 300. [RT #37556]
4238. [bug] Don't send to servers on net zero (0.0.0.0/8). 4238. [bug] Don't send to servers on net zero (0.0.0.0/8).
[RT #40947] [RT #40947]

2
bin/named/config.c
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@@ -156,7 +156,7 @@ options {\n\
cleaning-interval 0; /* now meaningless */\n\ cleaning-interval 0; /* now meaningless */\n\
# min-roots <obsolete>;\n\ # min-roots <obsolete>;\n\
lame-ttl 600;\n\ lame-ttl 600;\n\
servfail-ttl 10;\n\ servfail-ttl 1;\n\
max-ncache-ttl 10800; /* 3 hours */\n\ max-ncache-ttl 10800; /* 3 hours */\n\
max-cache-ttl 604800; /* 1 week */\n\ max-cache-ttl 604800; /* 1 week */\n\
transfer-format many-answers;\n\ transfer-format many-answers;\n\

4
bin/named/server.c
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@@ -4107,8 +4107,8 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
result = ns_config_get(maps, "servfail-ttl", &obj); result = ns_config_get(maps, "servfail-ttl", &obj);
INSIST(result == ISC_R_SUCCESS); INSIST(result == ISC_R_SUCCESS);
fail_ttl = cfg_obj_asuint32(obj); fail_ttl = cfg_obj_asuint32(obj);
if (fail_ttl > 300) if (fail_ttl > 30)
fail_ttl = 300; fail_ttl = 30;
dns_view_setfailttl(view, fail_ttl); dns_view_setfailttl(view, fail_ttl);
/* /*

8
doc/arm/Bv9ARM-book.xml
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@@ -8903,10 +8903,10 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
without waiting for the SERVFAIL TTL to expire. without waiting for the SERVFAIL TTL to expire.
</para> </para>
<para> <para>
The maximum value is <literal>300</literal> The maximum value is <literal>30</literal>
(5 minutes); any higher value will be silently seconds; any higher value will be silently
reduced. The default is <literal>10</literal> reduced. The default is <literal>1</literal>
seconds. second.
</para> </para>
</listitem> </listitem>
</varlistentry> </varlistentry>

2
doc/arm/notes.xml
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@@ -257,7 +257,7 @@
the cache times out. This reduces the frequency of retries the cache times out. This reduces the frequency of retries
when a query is persistently failing, which can be a burden when a query is persistently failing, which can be a burden
on recursive serviers. The SERVFAIL cache timeout is controlled on recursive serviers. The SERVFAIL cache timeout is controlled
by <option>servfail-ttl</option>, which defaults to 10 seconds by <option>servfail-ttl</option>, which defaults to 1 second
and has an upper limit of 30. and has an upper limit of 30.
</para> </para>
</listitem> </listitem>