"Broadcast NOTRAILERS"?

helloworld · 04-13-2001, 08:16 AM

I have to resolve to an DHCP server, which is not too keen about me using linux, so I can't ask for support there.
I am registered w/a different NIC so before the dhcpcd can start resolving I have to change my MAC using ifconfig.
The only way for me to get a IP seems to be w/the command dhcpcd -B which results in immediate response, but then I get the ' eth0 UP BROADCAST NOTRAILERS ' when running ifconfig. I could not find NOTRAILERS in the man pages, much less a way to switch into Multicast mode. What am I doing wrong here?

jeremy · 04-14-2001, 06:33 PM

From the BSD man page.

Quote:

trailers
Use a ``trailer'' link-level encapsulation when sending (default). If a network interface supports trailers, the system will encapsulate outgoing messages in a way that minimizes the number of memory-to-memory copy operations performed by the receiver. On networks that support the Address Resolution Protocol (see arp protocol; currently, only 10 Mb/s Ethernet), this flag indicates that the system should request that other systems use trailers when sending to this host. Similarly, trailer encapsulations will be sent to other hosts that have made such requests. Currently used by Internet protocols only.

helloworld · 04-15-2001, 01:09 PM

Thanks a lot, So if I see this right, the NOTRAILERs is not nessecarily wrong...
Hm, cause I do get IP, Netmask, Gateway etc. identical to the settings the same box gets under win. Nevertheless I can't even ping the DNS or DHCP server...
Since I expected to have the interface show up as multicast, I thought, that was my problem. So that Notrailers isn't the problem, where else can I find some practical reading or can you tell me which other sources for error there might be?
Thanks again for going all the way to the BSD MANs, I really appreciated it.

helloworld · 04-19-2001, 08:10 AM

Here are some of my settings:

eth0 Link encap:Ethernet HWaddr 00:00:XX:XX:XX:XX #the MAC I set
inet addr:XXX.XXX.XXX.202 Bcast:XXX.XXX.255.255 Mask:255.255.224.0
UP BROADCAST NOTRAILERS RUNNING MTU:1500 Metric:1
RX packets:649 errors:0 dropped:0 overruns:0 frame:0
TX packets:22 errors:0 dropped:0 overruns:0 frame:0
collisions:0 txqueuen:100 Interrupt:5 Base address:0xe400

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 frame:0
collisions:0 txqueuen:0

And here the /etc/dhcpc/dhcpcd-eth0.info after determining the IP successfully
via: dhcpcd -d -B eth0

IPADDR=XXX.XXX.XXX.202
NETMASK=255.255.224.0
NETWORK=XXX.XXX.224.0
BROADCAST=XXX.XXX.255.255
GATEWAY=XXX.XXX.224.2
HOSTNAME=my.host.name.goes.here
DOMAIN=my.provider.here
DNS=XXX.XXX.1.1,XXX.XXX.1.5
DHCPSID=XXX.XXX.1.1
DHCPGIADDR=XXX.XXX.224.2
DHCPSIADDR=XXX.XXX.1.169
DHCPCHADDR=00:00:XX:XX:XX:XX #the MAC that I set
DHCPSHADDR=00:02:XX:XX:XX:XX #other MAC which is not from my cable modem
DHCPSNAME=rl0001.my.provider.here
LEASETIME=260000
RENEWALTIME=130000
REBINDTIME=227500

Ok the problem that I have is, I cannot even ping the DNS or DHCP server, as it seems to drop my
packets. If I ping my IP +1 so that would be ..xxx.203 I get an "destination host unreachable".
With the DNS or DHCP I don't get that message. Is it likely that linux sends out packets with the
NIC's real MAC adress somehow, although both these printouts show the MAC it is supposed to send?
What other ways are there, why my ping bounces. The machine works fine under Win with a the different MAC,
so i can eliminate any Hardware error.My Linux is RH6.2 w/2.2.17 and a rtl 8139 NIC.

Someone please?