proxyarp, pppd does not remove the arp entries

proxyarp, pppd does not remove the arp entries

[Jochen Roedenbeck]

I set up a dialin server with mgetty and pppd. It works in general,
but there is a strange problem.

I use the option "proxyarp". When the connection is opened, an arp
entry is created with the address of the remote client, for example
192.168.76.72, which I checked using "arp -n". All works fine.

When the connection gets closed, the arp entry is not removed, as
it should. Instead the first number of the IP address, 192, is
changed to 191.

The arp chache gets longer and longer, and after some time it does not
work any more.

It is version 2.4.1 of pppd, and Linux kernel version 2.4.21. The
distribution is Suse.

What can I do?

Jochen Roedenbeck

Re: proxyarp, pppd does not remove the arp entries

[Jochen Roedenbeck]

Hallo,

Is there really no-one around here who knows about "proxyarp"?
I don't think it is an configuration issue.

Jochen Roedenbeck

Jochen Roedenbeck schrieb:
> I set up a dialin server with mgetty and pppd. It works in general,
> but there is a strange problem.
> 
> I use the option "proxyarp". When the connection is opened, an arp
> entry is created with the address of the remote client, for example
> 192.168.76.72, which I checked using "arp -n". All works fine.
> 
> When the connection gets closed, the arp entry is not removed, as
> it should. Instead the first number of the IP address, 192, is
> changed to 191.
> 
> The arp chache gets longer and longer, and after some time it does not
> work any more.
> 
> It is version 2.4.1 of pppd, and Linux kernel version 2.4.21. The
> distribution is Suse.
> 
> What can I do?
> 
> Jochen Roedenbeck
> -
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> the body of a message to majordomo@vger.kernel.org
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> 
> 
> 

Re: proxyarp, pppd does not remove the arp entries

[Ray Van Dolson]

I use proxyarp and have not seen this problem myself.  When users disconnect,
the arp entry is properly cleared.  However, I am using PPP 2.4.3 -- 2.4.1 is
a bit old; have you considered upgrading?

Ray

On Sat, Jan 22, 2005 at 01:48:14PM +0100, Jochen Roedenbeck wrote:
> I set up a dialin server with mgetty and pppd. It works in general,
> but there is a strange problem.
>
> I use the option "proxyarp". When the connection is opened, an arp
> entry is created with the address of the remote client, for example
> 192.168.76.72, which I checked using "arp -n". All works fine.
>
> When the connection gets closed, the arp entry is not removed, as
> it should. Instead the first number of the IP address, 192, is
> changed to 191.
>
> The arp chache gets longer and longer, and after some time it does not
> work any more.
>
> It is version 2.4.1 of pppd, and Linux kernel version 2.4.21. The
> distribution is Suse.
>
> What can I do?
>
> Jochen Roedenbeck

Re: proxyarp, pppd does not remove the arp entries

[Jochen Roedenbeck]

I tested PPP 2.4.3 now, and I must say, compiling the sources was easier
than I expected. However, the behavior is the same.

So I made some tests with the arp utility and tried to set up and delete
entries with it. And I had to experience that it was not possible to
delete entries which were created using the "pub" flag. It now
seems to me a problem of the arp cache handling software, not pppd.

Jochen


Ray Van Dolson schrieb:
> I use proxyarp and have not seen this problem myself.  When users disconnect,
> the arp entry is properly cleared.  However, I am using PPP 2.4.3 -- 2.4.1 is
> a bit old; have you considered upgrading?
> 
> Ray
> 
> On Sat, Jan 22, 2005 at 01:48:14PM +0100, Jochen Roedenbeck wrote:
> 
>>I set up a dialin server with mgetty and pppd. It works in general,
>>but there is a strange problem.
>>
>>I use the option "proxyarp". When the connection is opened, an arp
>>entry is created with the address of the remote client, for example
>>192.168.76.72, which I checked using "arp -n". All works fine.
>>
>>When the connection gets closed, the arp entry is not removed, as
>>it should. Instead the first number of the IP address, 192, is
>>changed to 191.
>>
>>The arp chache gets longer and longer, and after some time it does not
>>work any more.
>>
>>It is version 2.4.1 of pppd, and Linux kernel version 2.4.21. The
>>distribution is Suse.
>>
>>What can I do?
>>
>>Jochen Roedenbeck
> 
> 
> 
> 


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