<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; ">Hello all,</div><div><font size="3">i just configure an ipsec site to site vpn between Asa and a cisco 2811 router using cisco ASDM and CCP ,but the </font>tunnel comes up when i did and extended ping and after a while it goes down i try use cisco configuration professional (ccp ) to trouble shoot the link and it bring out this error <span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; background-color: rgb(255, 255, 255);">"A ping with data size of this VPN interface MTU size and 'Do not </span><span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">Fragment' bit set to the other end VPN device is failing. This may </span><span style="color: rgb(39, 61, 73); font-family:
arial; font-size: 13px; ">happen if there is a lesser MTU network which drops the 'Do not </span><span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">fragment' packets."</span></div><div><span style="background-color: rgb(255, 255, 255);"><font color="#273d49" face="arial" size="2">CCp suggests I can use crypto ipsec df-bit clear to resolve this or contact our ISP to resolve </font></span></div><div><span style="background-color: rgb(255, 255, 255);"><font color="#273d49" face="arial" size="2">i have reduce the mtu on the ASA and the router to </font></span><span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">1300,</span><span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">1460, 1400 and 1480 but still the network is slow and the tunnel will just go off when more user use the network and the tunnel goes down.</span></div><div><span
style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">they are for branch and linking to the asa.</span></div><div><span><span style="color: rgb(39, 61, 73); font-family: arial; font-size: 13px;">thanks for all you support in advance </span></span></div><div><span style="background-color: rgb(0, 0, 0); color: rgb(39, 61, 73); font-family: arial; font-size: 13px; ">I </span></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "> </div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><font size="6"><i><font color="#aea945" face="comic sans ms">God be with u all</font><img src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/40.gif"></i></font> </div> <div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><font color="#b27c51" face="times new roman" size="6"><i>A true friend is someone who reaches for
your hand and touches your heart</i></font>.<img src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/09.gif"></div><div style="font-family: 'times new roman', 'new york', times, serif; font-size: 12pt; "><br></div> </div></body></html>