45s login delay

[Magnus Nilsson]

Hello,

I have an issue with ~45s delay on every login (ssh, scp etc). Once the 
link is up dropbear runs fine.

After reading these forums, I have disabled reverse lookup and added 
client IP to /etc/hosts, but that didn't help.

I'm running dropbear 0.53.1 on armv4tl, uClinux 2.6.19, built largely 
like this:
http://hi.baidu.com/kkernel/blog/item/ff919681141beddebc3e1e23.html
but with --disable-shadow

This the verbose output:
# ./dropbear -a -F -v
TRACE (73): enter loadhostkeys
TRACE (73): enter buf_get_priv_key
TRACE (73): enter rsa_key_free
TRACE (73): leave rsa_key_free: key == NULL
TRACE (73): enter buf_get_rsa_priv_key
TRACE (73): enter buf_get_rsa_pub_key
TRACE (73): leave buf_get_rsa_pub_key: success
TRACE (73): leave buf_get_rsa_priv_key
TRACE (73): leave buf_get_priv_key
TRACE (73): enter buf_get_priv_key
TRACE (73): enter dsa_key_free
TRACE (73): enter dsa_key_free: key == NULL
TRACE (73): enter buf_get_dss_pub_key
TRACE (73): leave buf_get_dss_pub_key: success
TRACE (73): leave buf_get_priv_key
TRACE (73): leave loadhostkeys
TRACE (73): listensockets: 1 to try
TRACE (73): listening on ':22'
TRACE (73): enter dropbear_listen
TRACE (73): dropbear_listen: all interfaces
TRACE (73): bind(22) failed
TRACE (73): leave dropbear_listen: success, 1 socks bound
[73] Mar 14 17:17:30 Not backgrounding
[74] Mar 14 17:17:39 Child connection from 10.240.22.22:1456
TRACE (74): enter session_init
TRACE (74): setnonblocking: 3
TRACE (74): leave setnonblocking
TRACE (74): setnonblocking: 5
TRACE (74): leave setnonblocking
TRACE (74): kexinitialise()
TRACE (74): leave session_init
TRACE (74): enter ident_readln
TRACE (74): leave ident_readln: return 27
TRACE (74): remoteident: SSH-2.0-PuTTY_Release_0.60
TRACE (74): enter encrypt_packet()
TRACE (74): encrypt_packet type is 20
TRACE (74): enter writemac
TRACE (74): leave writemac
TRACE (74): enter enqueue
TRACE (74): leave enqueue
TRACE (74): leave encrypt_packet()
TRACE (74): DATAALLOWED=0
TRACE (74): -> KEXINIT
TRACE (74): enter write_packet
TRACE (74): empty queue dequeing
TRACE (74): leave write_packet
TRACE (74): enter read_packet
TRACE (74): packet size is 616, block 8 mac 0
TRACE (74): enter decrypt_packet
TRACE (74): enter writemac
TRACE (74): leave writemac
TRACE (74): leave decrypt_packet
TRACE (74): leave read_packet
TRACE (74): enter process_packet
TRACE (74): process_packet: packet type = 20
TRACE (74): <- KEXINIT
TRACE (74): enter recv_msg_kexinit
TRACE (74): buf_match_algo: 
diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
TRACE (74): kex algo diffie-hellman-group14-sha1
TRACE (74): buf_match_algo: ssh-rsa,ssh-dss
TRACE (74): hostkey algo ssh-rsa
TRACE (74): buf_match_algo: 
aes256-ctr,aes256-cbc,rijndael-cbc at lysator.liu.se,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,3des-ctr,3des-cbc,arcfour256,arcfour128
TRACE (74): enc c2s is  aes256-ctr
TRACE (74): buf_match_algo: 
aes256-ctr,aes256-cbc,rijndael-cbc at lysator.liu.se,aes192-ctr,aes192-cbc,aes128-ctr,aes128-cbc,blowfish-ctr,blowfish-cbc,3des-ctr,3des-cbc,arcfour256,arcfour128
TRACE (74): enc s2c is  aes256-ctr
TRACE (74): buf_match_algo: hmac-sha1,hmac-sha1-96,hmac-md5
TRACE (74): hash c2s is  hmac-sha1
TRACE (74): buf_match_algo: hmac-sha1,hmac-sha1-96,hmac-md5
TRACE (74): hash s2c is  hmac-sha1
TRACE (74): buf_match_algo: none,zlib
TRACE (74): hash c2s is  none
TRACE (74): buf_match_algo: none,zlib
TRACE (74): hash s2c is  none
TRACE (74): leave recv_msg_kexinit
TRACE (74): leave process_packet
TRACE (74): maybe_empty_reply_queue - no data allowed
TRACE (74): enter read_packet
TRACE (74): packet size is 272, block 8 mac 0
TRACE (74): enter decrypt_packet
TRACE (74): enter writemac
TRACE (74): leave writemac
TRACE (74): leave decrypt_packet
TRACE (74): leave read_packet
TRACE (74): enter process_packet
TRACE (74): process_packet: packet type = 30
TRACE (74): enter recv_msg_kexdh_init
TRACE (74): enter send_msg_kexdh_reply
TRACE (74): enter send_msg_kexdh_reply

<<<45s delay>>>

TRACE (74): enter buf_put_pub_key
TRACE (74): enter buf_put_rsa_pub_key
TRACE (74): enter buf_putmpint
<snip>


I'd be grateful for any ideas and suggestions. Thanks.

Kind regards/Magnus
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