| ascp4: Transferring from the Command Line with Ascp 4 | 158
en0) to receive and send the multicast streams, we must set the interface receiving and sending the multicast streams
as the server default interface.
Run the following command on a4_1:
# route delete default 10.215.0.1
# route add default 10.215.0.1
Run the following command on a4_2:
# route delete default 10.216.0.1
# route add default 10.216.0.1
Note: The interface IP addresses 10.215.0.1 and 10.216.0.1 routes are the primary gateways and route all
10.215.0.* and 10.216.0.* traffic, respectively.
Troubleshooting Stream Transfers
Multicast Transfer Fails with "Error: Empty file list from file/stdin"
This error might indicate that the transfer user has a docroot set in aspera.conf, which is not supported for
multicast-to-multicast transfers.
The transfer user who authenticates the multicast-to-multicast data stream transfer must have no docroot configured
in aspera.conf. A file restriction can be set instead to restrict access.
Run the following command to unset a docroot and set a file restriction:
# asconfigurator -x
"set_user_data;user_name,username;absolute,AS_NULL;file_restriction,|restriction"
The restriction can be set to allow all access (*) or limited by protocol, hostname or path:
Restriction Format Example
By protocol udp://*
tcp://*
By protocol and hostname udp://hostname*
By protocol, hostname, and port tcp://hostname:5000*
Transfer from macOS Fails
To diagnose the problem, re-run the stream transfer with the logging level set to debug by adding -DD to the
command. After the transfer fails, open the log file (homedir/Library/Logs/Aspera/) and search for an ERR
response.
ERR udp_io_open: failed to set rcvbugsz=10485760 (e=55)(ENOBUFS)
This error indicates that the socket buffer size on the Mac computer is too small to send or receive UDP packets. To
increase the socket buffer size, specify a large buffer size by adding the following parameters to the URL:
url/?rcvbufsz=4000000&sndbufsz=4000000
With these parameters, a transfer to and from a Mac computer is written similar to the following example:
# ascp4 -DD -m 12m -l 15m --mode send --host 10.13.117.12 --
user root --read-threads 1 --write-threads 1 --compression none
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