Here, I'll post all output.
root@antiX1:/home/paco# ifup eth1
Ignoring unknown interface eth1=eth1.
root@antiX1:/home/paco# dhclient eth1
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.
For info, please visit
https://www.isc.org/software/dhcp/Listening on LPF/eth1/00:02:2d:24:f7:95
Sending on LPF/eth1/00:02:2d:24:f7:95
Sending on Socket/fallback
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 19
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
lo no wireless extensions.
eth0 no wireless extensions.
eth1 IEEE 802.11b ESSID:""
Mode:Managed Frequency:2.457 GHz Access Point: None
Bit Rate:2 Mb/s Sensitivity:1/0
Retry limit:4 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=0/70 Signal level=-122 dBm Noise level=-122 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0