Ultra Messaging Knowledge Base
Socket Buffer Notes
Socket buffers: more complicated than you think - interesting information on receive-side UDP socket buffers.
Default UDP Send Buffer Size
Solaris
If you’re 5.11, then you should be using the “ipadm” command. For 5.10, “ndd” is right.
Also, here’s a very valuable page: https://docs.oracle.com/cd/E26502_01/html/E29022/appendixa-28.html#glbyv
Notice the name changes. On 5.10, send_buf is called udp_xmit_hiwat (which makes no sense to me, but oh well).
On my 5.10 machine:
# ndd -get /dev/udp '?'
? (read only)
udp_wroff_extra (read and write)
udp_ipv4_ttl (read and write)
udp_ipv6_hoplimit (read and write)
udp_smallest_nonpriv_port (read and write)
udp_do_checksum (read and write)
udp_smallest_anon_port (read and write)
udp_largest_anon_port (read and write)
udp_xmit_hiwat (read and write)
udp_xmit_lowat (read and write)
udp_recv_hiwat (read and write)
udp_max_buf (read and write)
udp_ndd_get_info_interval (read and write)
udp_extra_priv_ports (read only)
udp_extra_priv_ports_add (write only)
udp_extra_priv_ports_del (write only)
udp_status (read only)
udp_bind_hash (read only)
# ndd -get /dev/udp udp_xmit_hiwat
57344
Which matches the value documented.
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