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prefer-kex: Specifies the preferred key exchange algorithm. The default is dh-group-exchange in
non-FIPS mode and dh-group14 in FIPS mode. Algorithm dh-group14 features stronger security but costs
more time in calculation than dh-group1
• dh-group-exchange: Specifies the key exchange algorithm diffie-hellman-group-exchange-sha1.
• dh-group1: Specifies the key exchange algorithm diffie-hellman-group1-sha1.
• dh-group14: Specifies the key exchange algorithm diffie-hellman-group14-sha1.
prefer-stoc-cipher: Specifies the preferred server-to-client encryption algorithm. The default is aes128.
prefer-stoc-hmac: Specifies the preferred server-to-client HMAC algorithm. The default is sha1.
dscp dscp-value: Specifies the DSCP value in the IPv6 SSH packets sent by the SSH client, in the range
of 0 to 63. The default value is 48. The DSCP value determines the transmission priority of the packet.
publickey keyname: Specifies the server by its host public key, which is used to authenticate the server.
The keyname argument is a case-insensitive string of 1 to 64 characters.
source: Specifies a source IP address or source interface for IPv6 SSH packets. By default, the IPv6 SSH
packets automatically select an IPv6 address as their source address in compliance with RFC 3484. For
successful IPv6 Stelnet connections, use one of the following methods:
• Specify the loopback interface or dialer interface as the source interface.
• Specify the IPv6 address of the loopback interface or dialer interface as the source IPv6 address.
interface interface-type interface-number: Specifies a source interface by its type and number. The IPv6
address of this interface is the source IP address of the IPv6 SSH packets.
ipv6 ipv6-address: Specifies a source IPv6 address.
Usage guidelines
In publickey authentication, the client must get the local private key for digital signature. Because
publickey authentication uses either RSA or DSA algorithm, you must specify a public key algorithm by
using the identity-key keyword. In this way, the client can get the correct local private key.
Examples
# Establish a connection to the IPv6 Stelnet server 2000::1 and specify the public key of the server as
svkey. The SSH client uses publickey authentication. Use the following algorithms:
• Preferred key exchange algorithm is dh-group14.
• Preferred server-to-client encryption algorithm is aes128.
• Preferred client-to-server HMAC algorithm is sha1.
• Preferred server-to-client HMAC algorithm is sha1-96.
• Preferred compression algorithm between the server and client is zlib.
<Sysname> ssh2 ipv6 2000::1 prefer-kex dh-group14 prefer-stoc-cipher aes128
prefer-ctos-hmac sha1 prefer-stoc-hmac sha1-96 prefer-compress zlib publickey svkey
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