[strongSwan] %defaultroute resolves to link-local address

Daniel Pocock daniel at pocock.com.au
Thu Jul 4 23:58:53 CEST 2013

On 04/07/13 22:02, Volker Rümelin wrote:
> Hello Daniel,
>> 14:09:53.069743 IP6 SOURCENET::2 > DESTNET::6: frag (0|1400) 4500 >
>> 4500: NONESP-encap: isakmp: child_sa  ikev2_auth[I]
>> 14:09:53.070185 IP6 SOURCENET::2 > DESTNET::6: frag (1400|352)
>> 14:10:06.802214 IP6 DESTNET::6 > SOURCENET::2: ICMP6, time exceeded
>> in-transit (reassembly), length 1240
> this is most likely a firewall problem with your Debian machine. Only
> the first fragment is accepted by your netfilter rules and the second
> fragment is dropped, leading to a reassembly timeout after 60s.

I'm trying Shorewall firewall, is there a recommended set of parameters
for configuring Shorewall with StrongSwan?

On the certificate size issue: will using ECC instead of RSA make the
certificates small enough to avoid fragmentation?  What packet sizes
have been observed in practice with 384 bit ECC for example?

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