SSH Reference Manual

Arguments

FIRST|ALL

Specifies whether all IP addresses returned from a DNS server or only the first one are considered. Valid values

are:

o FIRST for using just the first IP address.

o ALL for using all returned IP addresses.

Default

If omitted, FIRST is the default value, ensuring the DNS name resolving is handled as before introduction of this

parameter.

Considerations

• One TCP/IP operation like listen or connect can only be done using exactly one IP address (which could be the

ANY address in case of listen). See section "Multiple IP Process, Multiple IP Address Considerations

" for more

details.

• If DNS name resolving results in a list of IP addresses, then IPv4 and IPv6 IP addresses may appear in the list.

• The parameter setting is not only relevant for target host names specified by local SSH[OSS] and SSFTP[OSS]

clients but also for names configured in parameter INTERFACE and INTERFACEOUT

in that now multiple

listens will be issued even if only one host name is configured for INTERFACE in case the DNS name

resolving results in multiple IP addresses.

• Similarly, with DNSMODE ALL, local IP addresses used for outgoing connections are selected from a list of IP

addresses in case multiple addresses are configured for a host name configured via INTERFACEOUT.

Example

DNSMODE ALL