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Arp not working

Arp not working

Post by David Rudd » Tue, 22 Nov 1994 17:14:29



I'm trying to set up a slip line running from my Unixware SysV R4.2 box
to a PC running Trumpter WinSock.  I have the line running from the PC
to the server fine.  Now, I need to publish the ip# for the PC as the
server.  Arp works fine for the router and the server.  But, when I
publish the arp, it does not get distributed.

In otherwords:  I type in:
arp -s 192.251.139.227 0:0:e8:c5:85:2c pub on my unix box.

When I type arp -a, it returns the published address fine.
When I type arp on my router (386 sx40 running ka9q), it doesn't show
the entry.  I tried a bunch of different addresses and numbers.  Publish
simply does not work.

The arp tables work fine for normal addresses.  The address shows up on
the router for the server and vica versa.  It is only when publishing
that I get a problem.  

Any ideas?  Could it be something I set outside of arp?

Thanks in advance,

David Rudder

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1. Proxy arp not working in Linux

I'm having a problem configuring proxy arp.  My understanding is that
first proxy arp must be enabled in the kernel by setting one or more of
these variables to "1".

/proc/sys/net/ipv4/conf/eth0/proxy_arp
/proc/sys/net/ipv4/conf/lo/proxy_arp
/proc/sys/net/ipv4/conf/default/proxy_arp
/proc/sys/net/ipv4/conf/all/proxy_arp

Inititially, I set just eth0, but then tried setting them all when it
didn't work.  I set the variables in /etc/sysctl.conf, stopped and
restarted the interface, and checked to make certain they were all set.

After setting the kernel variables, I added a permanent, published arp
table entry as follows:

# arp -s 192.168.18.230 00:B0:D0:B5:52:F9 pub

Also tried this:

# arp -i eth0 -s 192.168.18.230 -D eth0 pub

Here's what's in the arp cache after adding the entry:

# arp -an
? (192.168.18.12) at 00:0D:56:A3:90:83 [ether] on eth0
? (192.168.18.1) at 00:00:0C:07:AC:01 [ether] on eth0
? (192.168.18.230) at * PERM PUP on eth0

# cat /proc/net/arp
IP address       HW type     Flags       HW address            Mask
Device
192.168.18.12    0x1         0x2         00:0D:56:A3:90:83     *
eth0
192.168.18.1     0x1         0x2         00:00:0C:07:AC:01     *
eth0
192.168.18.230   0x1         0xc         00:00:00:00:00:00     *
eth0

The "*" in the arp -an output doesn't look right, and the HW address
for 192.168.18.230 is definitely not right.

But, just to see if it would respond I pinged it from another box on
the local subnet.  I don't expect icmp echo replies at this point,
since the box is not routing.  But I did expect to see an arp reply if
it was configured correctly.  But there's no reply.  I tried the same
thing on a Solaris system and it works fine.  What else needs to be
done to make this work in Linux?  I tried it on two different Redhat
systems, 2.6.11-1.14_FC3 and 2.6.9-5.Elsmp, with the same results.

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