On Thu, Oct 18, 2018 at 05:52:47PM +0200, Anthonin Bonnefoy wrote: > From: Anthonin Bonnefoy <anthonin.bonne...@datadoghq.com> > > With EDNS, DNS packets can have a maximum size of 65507. > This will allow to have a bigger accepted_payload_size which is useful > when we have more than 100 SRV records.
Baptiste, please have a look at this one, I want to be sure we don't miss it if needed. Thanks, Willy > --- > include/types/dns.h | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/include/types/dns.h b/include/types/dns.h > index 488d3996..53f24c19 100644 > --- a/include/types/dns.h > +++ b/include/types/dns.h > @@ -42,7 +42,10 @@ > */ > #define DNS_MAX_LABEL_SIZE 63 > #define DNS_MAX_NAME_SIZE 255 > -#define DNS_MAX_UDP_MESSAGE 8192 > +/* With EDNS, DNS message can reach the maximum size of an UDP message > + * which is (65535 - 8 bytes UDP header - 20 bytes IP header) > + */ > +#define DNS_MAX_UDP_MESSAGE 65507 > > /* DNS minimun record size: 1 char + 1 NULL + type + class */ > #define DNS_MIN_RECORD_SIZE (1 + 1 + 2 + 2) > -- > 2.13.2 >
